choropleth

Choropleth maps, which encode data through color and geographical region, are also commonly used.

Choropleth maps are one of the most commonly used means of displaying areal data.

Choropleth maps use color hue and intensity to contrast differences between regions, such as demographic or economic statistics.

Choropleth maps are most effective when the data or classes change abruptly at each enumerated boundary (Slocum, McMaster, Kessler, & Howard, 2005).

Choropleth maps are frequently used in inappropriate applications due to the abundance of choropleth data and the ease of design using Geographic Information Systems.

Choropleth maps using different colours to represent different levels of the mapped variable can be generated by specifying one of the 125 colours to be used as the area fill colour.

Choropleth maps are maps which show the distribution of the magnitude of a variable such as population density for each of a set of areal units such as counties or enumeration districts.

Choropleth maps are based on statistical data aggregated over previously defined regions (e.g., counties), in contrast to area-class and isarithmic maps, in which region boundaries are defined by data patterns.