Creating choropleth interactive maps
In an Interactive Map visual, CDP Data Visualization enables you to create choropleth maps. A choropleth map shows geographical areas that are shaded in proportion to the value of the measurement that is displayed on the map.
To create a choropleth map, for each visual, you must specify the following:
- Custom mapbox style, which has a choropleth shape file in it. See Adding a custom mapbox style.
- Layer ID, which is the name of a unique layer within the Custom Mapbox style that identifies the shapes that you would like to color by a measure in your data. See Specifying a choropleth layeer ID.
- Geo-type as Shape ID: The Arcadia dataset must have at least one field in the Geo shelf to determine the location on the map. You must change the Geo-type to Shape ID. A Shape ID is a key that joins the shapes in the Custom mapbox style and the field in the Arcadia dataset. This helps in identifying the measure that maps to the shape. This Geo field must be in the dataset that was used to create the custom mapbox style.
Let's create a choropleth map that colors the average tax liability in California by zip code.
In our example, the choropleth interactive map visual is based on the dataset
Personal Income Tax Statistics by Zip Code
. For an
overview of shelves that specify this visual, see Shelves for
interactive maps.
Proceed to Customizing the choropleth map.