size variable

A size variable is a visual variableVisual variables are a set of parameters that define one or more properties of a renderer's symbols based on the numeric data value returned from a field or expression.Learn more that defines the size of a symbolA symbol defines the properties used to display a geometry or text.Learn more based on a numeric data value returned from a field or expression. This does not apply to renderers with fill symbols. To visualize a polygon layer by size, you should use a marker symbol, which will be rendered at the centroid of the polygon.

A size visual variable can be defined in two ways:

1. With size stops; or
2. Matching a maxDataValue with a maxSize, and a minDataValue with a minSize.

Size visual variables require the following:

1. A reference to a data value either from a field name, or an ArcadeArcade is a lightweight and secure expression language used in ArcGIS products and APIs. Arcade expressions are commonly used to calculate or format field values for data-driven visualizations, labels, and popups. The expressions work against data stored in data services.Learn more expression.
2. At least two size stops that match data values to sizes. The sizes of symbols with data values between the designated stops are interpolated linearly.