size variable

A size variable is a visual variable that defines the size of a symbol 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 Arcade 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.