Visualization

The visualization profile allows the map author to write an expression that evaluates to a value used to drive the visualization. This could be used for a visual variable such as size, or as a value in a class breaks renderer. When the feature is to be drawn, the script will be evaluated. It is expected that the script returns a value specific to the rendering property being calculated (e.g. A number for a class breaks visualization or text for a unique value visualization).

Context

The following products implement this profile:

Spatial reference

The spatial reference of the map in which the expression executes determines the execution context's spatial reference.

Time zone

The time zone of the map in which the expression executes determines the execution context's default time zone.

Profile variables

Variable Name	Type	Description
$feature	Feature	The feature which is to be drawn on the map.
$view.scale	Number	Returns the scale of the map at the time the expression evaluates. Only supported in 2D MapViews.

Function bundles

Core | Geometry

Return types

Text | Number

Example

Calculates the predominant political party within each feature.

Use dark colors for code blocksCopy
var republican = $feature.MP06025a_B;
var democrat = $feature.MP06024a_B;
var independent = $feature.MP06026a_B;
var parties = [republican, democrat, independent];

return Decode( Max(parties),
  republican, 'republican',
  democrat, 'democrat',
  independent, 'independent',
  'n/a'
);