The Choropleth lets you compare values by geographic region.
|Required Dimensions||1||Geographic dimension of Countries, States in the United States, or Counties in the United States.|
|Required Measures||1-2||Measure 1 = color.|
Choropleth comes from the Greek choros (area) and pleth (value). Immerse colors the map regions based on the measure. You can compare colors from your chosen palette to understand the relative value of one region to another.
Use a Choropleth to compare aggregate values across regions. Choropleths are useful for spotting outliers, but are not intended to provide detail on the values within a region. (For detailed, point-level geographic information, consider using a Pointmap.)
When you assign a map overlay, the region names in the dataset column you select must match the names in the overlay. The column you choose can spell out the name of the region, or use a standard abbreviation, but cannot use both.
For countries, you can use a dataset column with the two- or three-character abbreviation, or one that spells out the full name. See Country Names and Abbreviations.
For US states, you can choose a column with either the full name or the two character abbreviation. See United States State Abbreviations.
The list of supported US county names is provided in the file United States Counties.
This example graphs employment statistics for all 50 United States for the years 1980-2015. The data is available at the University of Kentucky website.
Create a Choropleth using state_name as the dimension and average Employment as the Color measure. Set GEO JSON JOIN to US State to overlay the defined geojson shapes onto the map.