Zuweisen farbiger Symbole zu Attributen unter Verwendung von Arcade-Ausdrücken in ArcGIS Online

Zusammenfassung

In ArcGIS Online, assigning various colored symbols to one or more attribute fields in a dataset provides better visualization of spatial data on a map. When there is irrelevant data within the same fields, Arcade expressions and the Symbology tool can be used to further categorize a collection of attribute fields to offer a more focused display of symbology points.

The instructions below describe how to use the Field Calculator in ArcGIS Online to identify a specific set of attribute fields to display on a map. In this example, the LEVEL field in the Schools Article Testing feature class is used to identify the attribute field symbology points for elementary, high school, and college or university.

Vorgehensweise

1. Open the map in Map Viewer. Click Layers, and select the <layer name> for editing.

2. On the Settings (light) toolbar, click Styles > Expression to open the Arcade Expression dialog box.

3. Specify the following Arcade expression in the Arcade Expression dialog box.

var <variable name> = $feature.<field name>
if (<variable name> == "<field value>") {
    return "<label name>";
} else if (<variable name> == "<field value>") {
    return "<label name>";
} else if (<variable name> == "<field value>") {
    return "<label name>";
} else if (<variable name> == "<field value>") {
    return "<label name>";
}

4. Rename the New expression, and click OK.

5. Click Styles options in the Styles pane.

6. Uncheck the Other checkbox. To apply further changes to the symbol style, click the color ramp under Symbol style.
7. Click Done to close the Style options pane.

8. Click Done to close the Styles pane.