![]() ![]() ![]() ![]() In such a situation, the displayed pattern is caused as much by the size, shape, distribution, and composition of the enumeration units as the mapped variable itself. A choropleth map of a raw incidence count inaccurately reflects the spatial pattern of the mapped phenomenon, as enumeration units containing large populations are capable of having higher incidence counts than their small population counterparts. Although a popular thematic mapping choice, choropleth maps often mislead. Geographically-referenced social data are typically represented by choropleth maps, a cartographic technique that aggregates individual incidences according to a set of data collection units and then colours each unit by its aggregate value ( Slocum et al., 2005). ![]()
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