Channel Options

Some encoding channels allow for additional options to be expressed. These can control things like axis properties, scale properties, headers and titles, binning parameters, aggregation, sorting, and many more.

The section titles below refer to the channels introduced in Channels and show the accepted options for these channels.

X and Y

The X and Y encodings accept the following options:

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Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
axis	anyOf(Axis, null)	An object defining properties of axis’s gridlines, ticks and labels. If null, the axis for the encoding channel will be removed. Default value: If undefined, default axis properties are applied. See also: axis documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, string, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
impute	anyOf(ImputeParams, null)	An object defining the properties of the Impute Operation to be applied. The field value of the other positional channel is taken as key of the Impute Operation. The field of the color channel if specified is used as groupby of the Impute Operation. See also: impute documentation.
scale	anyOf(Scale, null)	An object defining properties of the channel’s scale, which is the function that transforms values in the data domain (numbers, dates, strings, etc) to visual values (pixels, colors, sizes) of the encoding channels. If null, the scale will be disabled and the data value will be directly encoded. Default value: If undefined, default scale properties are applied. See also: scale documentation.
sort	Sort	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A string indicating an encoding channel name to sort by (e.g., "x" or "y") with an optional minus prefix for descending sort (e.g., "-x" to sort by x-field, descending). This channel string is short-form of a sort-by-encoding definition. For example, "sort": "-x" is equivalent to "sort": {"encoding": "x", "order": "descending"}. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null and sorting by another channel is not supported for row and column. See also: sort documentation.
stack	anyOf(StackOffset, null, boolean)	Type of stacking offset if the field should be stacked. stack is only applicable for x, y, theta, and radius channels with continuous domains. For example, stack of y can be used to customize stacking for a vertical bar chart. stack can be one of the following values: "zero" or true: stacking with baseline offset at zero value of the scale (for creating typical stacked bar and area chart). "normalize" - stacking with normalized domain (for creating normalized stacked bar and area charts and pie charts with percentage tooltip). "center" - stacking with center baseline (for streamgraph). null or false - No-stacking. This will produce layered bar and area chart. Default value: zero for plots with all of the following conditions are true: (1) the mark is bar, area, or arc; (2) the stacked measure channel (x or y) has a linear scale; (3) At least one of non-position channels mapped to an unaggregated field that is different from x and y. Otherwise, null by default. See also: stack documentation.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Color, Fill, and Stroke

The Color, Fill, and Stroke encodings accept the following options:

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Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
condition	anyOf(ConditionalValueDef<(Gradient|string|null|ExprRef)>, array(ConditionalValueDef<(Gradient|string|null|ExprRef)>))	One or more value definition(s) with a parameter or a test predicate. Note: A field definition’s condition property can only contain conditional value definitions since Vega-Lite only allows at most one encoded field per encoding channel.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
legend	anyOf(Legend, null)	An object defining properties of the legend. If null, the legend for the encoding channel will be removed. Default value: If undefined, default legend properties are applied. See also: legend documentation.
scale	anyOf(Scale, null)	An object defining properties of the channel’s scale, which is the function that transforms values in the data domain (numbers, dates, strings, etc) to visual values (pixels, colors, sizes) of the encoding channels. If null, the scale will be disabled and the data value will be directly encoded. Default value: If undefined, default scale properties are applied. See also: scale documentation.
sort	Sort	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A string indicating an encoding channel name to sort by (e.g., "x" or "y") with an optional minus prefix for descending sort (e.g., "-x" to sort by x-field, descending). This channel string is short-form of a sort-by-encoding definition. For example, "sort": "-x" is equivalent to "sort": {"encoding": "x", "order": "descending"}. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null and sorting by another channel is not supported for row and column. See also: sort documentation.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Shape

The Shape encoding accepts the following options:

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Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
condition	anyOf(ConditionalValueDef<(string|null|ExprRef)>, array(ConditionalValueDef<(string|null|ExprRef)>))	One or more value definition(s) with a parameter or a test predicate. Note: A field definition’s condition property can only contain conditional value definitions since Vega-Lite only allows at most one encoded field per encoding channel.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
legend	anyOf(Legend, null)	An object defining properties of the legend. If null, the legend for the encoding channel will be removed. Default value: If undefined, default legend properties are applied. See also: legend documentation.
scale	anyOf(Scale, null)	An object defining properties of the channel’s scale, which is the function that transforms values in the data domain (numbers, dates, strings, etc) to visual values (pixels, colors, sizes) of the encoding channels. If null, the scale will be disabled and the data value will be directly encoded. Default value: If undefined, default scale properties are applied. See also: scale documentation.
sort	Sort	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A string indicating an encoding channel name to sort by (e.g., "x" or "y") with an optional minus prefix for descending sort (e.g., "-x" to sort by x-field, descending). This channel string is short-form of a sort-by-encoding definition. For example, "sort": "-x" is equivalent to "sort": {"encoding": "x", "order": "descending"}. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null and sorting by another channel is not supported for row and column. See also: sort documentation.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	TypeForShape	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Order

The Order encoding accepts the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, string, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
sort	SortOrder	The sort order. One of "ascending" (default) or "descending".
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Angle, FillOpacity, Opacity, Size, StrokeOpacity, and StrokeWidth

The Angle, FillOpacity, Opacity, Size, StrokeOpacity, and StrokeWidth encodings accept the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
condition	anyOf(ConditionalValueDef<(number|ExprRef)>, array(ConditionalValueDef<(number|ExprRef)>))	One or more value definition(s) with a parameter or a test predicate. Note: A field definition’s condition property can only contain conditional value definitions since Vega-Lite only allows at most one encoded field per encoding channel.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
legend	anyOf(Legend, null)	An object defining properties of the legend. If null, the legend for the encoding channel will be removed. Default value: If undefined, default legend properties are applied. See also: legend documentation.
scale	anyOf(Scale, null)	An object defining properties of the channel’s scale, which is the function that transforms values in the data domain (numbers, dates, strings, etc) to visual values (pixels, colors, sizes) of the encoding channels. If null, the scale will be disabled and the data value will be directly encoded. Default value: If undefined, default scale properties are applied. See also: scale documentation.
sort	Sort	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A string indicating an encoding channel name to sort by (e.g., "x" or "y") with an optional minus prefix for descending sort (e.g., "-x" to sort by x-field, descending). This channel string is short-form of a sort-by-encoding definition. For example, "sort": "-x" is equivalent to "sort": {"encoding": "x", "order": "descending"}. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null and sorting by another channel is not supported for row and column. See also: sort documentation.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

StrokeDash

The StrokeDash encoding accepts the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
condition	anyOf(ConditionalValueDef<(number[]|ExprRef)>, array(ConditionalValueDef<(number[]|ExprRef)>))	One or more value definition(s) with a parameter or a test predicate. Note: A field definition’s condition property can only contain conditional value definitions since Vega-Lite only allows at most one encoded field per encoding channel.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
legend	anyOf(Legend, null)	An object defining properties of the legend. If null, the legend for the encoding channel will be removed. Default value: If undefined, default legend properties are applied. See also: legend documentation.
scale	anyOf(Scale, null)	An object defining properties of the channel’s scale, which is the function that transforms values in the data domain (numbers, dates, strings, etc) to visual values (pixels, colors, sizes) of the encoding channels. If null, the scale will be disabled and the data value will be directly encoded. Default value: If undefined, default scale properties are applied. See also: scale documentation.
sort	Sort	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A string indicating an encoding channel name to sort by (e.g., "x" or "y") with an optional minus prefix for descending sort (e.g., "-x" to sort by x-field, descending). This channel string is short-form of a sort-by-encoding definition. For example, "sort": "-x" is equivalent to "sort": {"encoding": "x", "order": "descending"}. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null and sorting by another channel is not supported for row and column. See also: sort documentation.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Row and Column

The Row and Column, and Facet encodings accept the following options:

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Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
align	LayoutAlign	The alignment to apply to row/column facet’s subplot. The supported string values are "all", "each", and "none". For "none", a flow layout will be used, in which adjacent subviews are simply placed one after the other. For "each", subviews will be aligned into a clean grid structure, but each row or column may be of variable size. For "all", subviews will be aligned and each row or column will be sized identically based on the maximum observed size. String values for this property will be applied to both grid rows and columns. Default value: "all".
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
center	boolean	Boolean flag indicating if facet’s subviews should be centered relative to their respective rows or columns. Default value: false
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
header	anyOf(Header, null)	An object defining properties of a facet’s header.
sort	anyOf(SortArray, SortOrder, EncodingSortField, null)	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null is not supported for row and column.
spacing	number	The spacing in pixels between facet’s sub-views. Default value: Depends on "spacing" property of the view composition configuration (20 by default)
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Facet

The Facet encoding accepts the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
align	anyOf(LayoutAlign, RowCol<LayoutAlign>)	The alignment to apply to grid rows and columns. The supported string values are "all", "each", and "none". For "none", a flow layout will be used, in which adjacent subviews are simply placed one after the other. For "each", subviews will be aligned into a clean grid structure, but each row or column may be of variable size. For "all", subviews will be aligned and each row or column will be sized identically based on the maximum observed size. String values for this property will be applied to both grid rows and columns. Alternatively, an object value of the form {"row": string, "column": string} can be used to supply different alignments for rows and columns. Default value: "all".
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
bounds	[‘full’, ‘flush’]	The bounds calculation method to use for determining the extent of a sub-plot. One of full (the default) or flush. If set to full, the entire calculated bounds (including axes, title, and legend) will be used. If set to flush, only the specified width and height values for the sub-view will be used. The flush setting can be useful when attempting to place sub-plots without axes or legends into a uniform grid structure. Default value: "full"
center	anyOf(boolean, RowCol<boolean>)	Boolean flag indicating if subviews should be centered relative to their respective rows or columns. An object value of the form {"row": boolean, "column": boolean} can be used to supply different centering values for rows and columns. Default value: false
columns	number	The number of columns to include in the view composition layout. Default value: undefined – An infinite number of columns (a single row) will be assumed. This is equivalent to hconcat (for concat) and to using the column channel (for facet and repeat). Note: This property is only for: the general (wrappable) concat operator (not hconcat/vconcat) the facet and repeat operator with one field/repetition definition (without row/column nesting) Setting the columns to 1 is equivalent to vconcat (for concat) and to using the row channel (for facet and repeat).
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
header	anyOf(Header, null)	An object defining properties of a facet’s header.
sort	anyOf(SortArray, SortOrder, EncodingSortField, null)	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null is not supported for row and column.
spacing	anyOf(number, RowCol<number>)	The spacing in pixels between sub-views of the composition operator. An object of the form {"row": number, "column": number} can be used to set different spacing values for rows and columns. Default value: Depends on "spacing" property of the view composition configuration (20 by default)
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Text

The Text encoding accepts the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, string, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
condition	anyOf(ConditionalValueDef<(Text|ExprRef)>, array(ConditionalValueDef<(Text|ExprRef)>))	One or more value definition(s) with a parameter or a test predicate. Note: A field definition’s condition property can only contain conditional value definitions since Vega-Lite only allows at most one encoded field per encoding channel.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
format	anyOf(string, Dict)	When used with the default "number" and "time" format type, the text formatting pattern for labels of guides (axes, legends, headers) and text marks. If the format type is "number" (e.g., for quantitative fields), this is D3’s number format pattern. If the format type is "time" (e.g., for temporal fields), this is D3’s time format pattern. See the format documentation for more examples. When used with a custom formatType, this value will be passed as format alongside datum.value to the registered function. Default value: Derived from numberFormat config for number format and from timeFormat config for time format.
formatType	string	The format type for labels. One of "number", "time", or a registered custom format type. Default value: "time" for temporal fields and ordinal and nominal fields with timeUnit. "number" for quantitative fields as well as ordinal and nominal fields without timeUnit.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Href, Tooltip, Url

The Href, Tooltip, and Url encodings accept the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, string, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
condition	anyOf(ConditionalValueDef<(string|ExprRef)>, array(ConditionalValueDef<(string|ExprRef)>))	One or more value definition(s) with a parameter or a test predicate. Note: A field definition’s condition property can only contain conditional value definitions since Vega-Lite only allows at most one encoded field per encoding channel.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
format	anyOf(string, Dict)	When used with the default "number" and "time" format type, the text formatting pattern for labels of guides (axes, legends, headers) and text marks. If the format type is "number" (e.g., for quantitative fields), this is D3’s number format pattern. If the format type is "time" (e.g., for temporal fields), this is D3’s time format pattern. See the format documentation for more examples. When used with a custom formatType, this value will be passed as format alongside datum.value to the registered function. Default value: Derived from numberFormat config for number format and from timeFormat config for time format.
formatType	string	The format type for labels. One of "number", "time", or a registered custom format type. Default value: "time" for temporal fields and ordinal and nominal fields with timeUnit. "number" for quantitative fields as well as ordinal and nominal fields without timeUnit.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Detail

The Detail encoding accepts the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, string, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Latitude and Longitude

The Latitude and Longitude encodings accept the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	null	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	string	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Radius and Theta

The Radius and Theta encodings accept the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	anyOf(boolean, BinParams, string, null)	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
scale	anyOf(Scale, null)	An object defining properties of the channel’s scale, which is the function that transforms values in the data domain (numbers, dates, strings, etc) to visual values (pixels, colors, sizes) of the encoding channels. If null, the scale will be disabled and the data value will be directly encoded. Default value: If undefined, default scale properties are applied. See also: scale documentation.
sort	Sort	Sort order for the encoded field. For continuous fields (quantitative or temporal), sort can be either "ascending" or "descending". For discrete fields, sort can be one of the following: "ascending" or "descending" – for sorting by the values’ natural order in JavaScript. A string indicating an encoding channel name to sort by (e.g., "x" or "y") with an optional minus prefix for descending sort (e.g., "-x" to sort by x-field, descending). This channel string is short-form of a sort-by-encoding definition. For example, "sort": "-x" is equivalent to "sort": {"encoding": "x", "order": "descending"}. A sort field definition for sorting by another field. An array specifying the field values in preferred order. In this case, the sort order will obey the values in the array, followed by any unspecified values in their original order. For discrete time field, values in the sort array can be date-time definition objects. In addition, for time units "month" and "day", the values can be the month or day names (case insensitive) or their 3-letter initials (e.g., "Mon", "Tue"). null indicating no sort. Default value: "ascending" Note: null and sorting by another channel is not supported for row and column. See also: sort documentation.
stack	anyOf(StackOffset, null, boolean)	Type of stacking offset if the field should be stacked. stack is only applicable for x, y, theta, and radius channels with continuous domains. For example, stack of y can be used to customize stacking for a vertical bar chart. stack can be one of the following values: "zero" or true: stacking with baseline offset at zero value of the scale (for creating typical stacked bar and area chart). "normalize" - stacking with normalized domain (for creating normalized stacked bar and area charts and pie charts with percentage tooltip). "center" - stacking with center baseline (for streamgraph). null or false - No-stacking. This will produce layered bar and area chart. Default value: zero for plots with all of the following conditions are true: (1) the mark is bar, area, or arc; (2) the stacked measure channel (x or y) has a linear scale; (3) At least one of non-position channels mapped to an unaggregated field that is different from x and y. Otherwise, null by default. See also: stack documentation.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.
type	StandardType	The type of measurement ("quantitative", "temporal", "ordinal", or "nominal") for the encoded field or constant value (datum). It can also be a "geojson" type for encoding ‘geoshape’. Vega-Lite automatically infers data types in many cases as discussed below. However, type is required for a field if: (1) the field is not nominal and the field encoding has no specified aggregate (except argmin and argmax), bin, scale type, custom sort order, nor timeUnit or (2) if you wish to use an ordinal scale for a field with bin or timeUnit. Default value: For a data field, "nominal" is the default data type unless the field encoding has aggregate, channel, bin, scale type, sort, or timeUnit that satisfies the following criteria: "quantitative" is the default type if (1) the encoded field contains bin or aggregate except "argmin" and "argmax", (2) the encoding channel is latitude or longitude channel or (3) if the specified scale type is a quantitative scale. "temporal" is the default type if (1) the encoded field contains timeUnit or (2) the specified scale type is a time or utc scale "ordinal" is the default type if (1) the encoded field contains a custom sort order, (2) the specified scale type is an ordinal/point/band scale, or (3) the encoding channel is order. For a constant value in data domain (datum): "quantitative" if the datum is a number "nominal" if the datum is a string "temporal" if the datum is a date time object Note: Data type describes the semantics of the data rather than the primitive data types (number, string, etc.). The same primitive data type can have different types of measurement. For example, numeric data can represent quantitative, ordinal, or nominal data. Data values for a temporal field can be either a date-time string (e.g., "2015-03-07 12:32:17", "17:01", "2015-03-16". "2015") or a timestamp number (e.g., 1552199579097). When using with bin, the type property can be either "quantitative" (for using a linear bin scale) or "ordinal" (for using an ordinal bin scale). When using with timeUnit, the type property can be either "temporal" (default, for using a temporal scale) or "ordinal" (for using an ordinal scale). When using with aggregate, the type property refers to the post-aggregation data type. For example, we can calculate count distinct of a categorical field "cat" using {"aggregate": "distinct", "field": "cat"}. The "type" of the aggregate output is "quantitative". Secondary channels (e.g., x2, y2, xError, yError) do not have type as they must have exactly the same type as their primary channels (e.g., x, y). See also: type documentation.

Latitude2, Longitude2, Radius2, Theta2, X2, Y2, XError, YError, XError2, and YError2

The Latitude2, Longitude2, Radius2, Theta2, X2, Y2, XError, YError, XError2, and YError2 encodings accept the following options:

Click to show table

Property	Type	Description
aggregate	Aggregate	Aggregation function for the field (e.g., "mean", "sum", "median", "min", "max", "count"). Default value: undefined (None) See also: aggregate documentation.
bandPosition	number	Relative position on a band of a stacked, binned, time unit, or band scale. For example, the marks will be positioned at the beginning of the band if set to 0, and at the middle of the band if set to 0.5.
bin	null	A flag for binning a quantitative field, an object defining binning parameters, or indicating that the data for x or y channel are binned before they are imported into Vega-Lite ("binned"). If true, default binning parameters will be applied. If "binned", this indicates that the data for the x (or y) channel are already binned. You can map the bin-start field to x (or y) and the bin-end field to x2 (or y2). The scale and axis will be formatted similar to binning in Vega-Lite. To adjust the axis ticks based on the bin step, you can also set the axis’s tickMinStep property. Default value: false See also: bin documentation.
field	Field	Required. A string defining the name of the field from which to pull a data value or an object defining iterated values from the repeat operator. See also: field documentation. Notes: 1) Dots (.) and brackets ([ and ]) can be used to access nested objects (e.g., "field": "foo.bar" and "field": "foo['bar']"). If field names contain dots or brackets but are not nested, you can use \\ to escape dots and brackets (e.g., "a\\.b" and "a\\[0\\]"). See more details about escaping in the field documentation. 2) field is not required if aggregate is count.
timeUnit	anyOf(TimeUnit, BinnedTimeUnit, TimeUnitParams)	Time unit (e.g., year, yearmonth, month, hours) for a temporal field. or a temporal field that gets casted as ordinal. Default value: undefined (None) See also: timeUnit documentation.
title	anyOf(Text, null)	A title for the field. If null, the title will be removed. Default value: derived from the field’s name and transformation function (aggregate, bin and timeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g., "Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g., "Profit (binned)", "Transaction Date (year-month)"). Otherwise, the title is simply the field name. Notes: You can customize the default field title format by providing the fieldTitle property in the config or fieldTitle function via the compile function’s options. If both field definition’s title and axis, header, or legend title are defined, axis/header/legend title will be used.