choropleth map

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Noun1.choropleth map - a map that uses graded differences in shading or color or the placing of symbols inside defined areas on the map in order to indicate the average values of some property or quantity in those areas
map - a diagrammatic representation of the earth's surface (or part of it)
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Step 3 Select either 'mammals', 'birds', 'reptiles' or 'amphibians' and examine the chloropleth key What does each colour represent (the frequency of sightings for that group)?
While many of the maps use one or more of chloropleth techniques, dot mapping, or proportional circles or arrows, some of the graphics use more interesting and, consequently, hard-hitting techniques.
The regional pattern can also be depicted visually by the application of some techniques of chloropleth mapping.