Banking in a village in rural India
Achoropleth or proportionalshading map is used to display spatial variations in data between different areas using different colours or shading and a key. The data must be comparable between areas and therefore values must be standardised, for example, ratios, averages or percentages.
Choropleth maps can be used to show information at different scales, from shading countries on a world map, to shading of wards in a city. These maps are fairly simple to create. There are, however, some advantages and disadvantages to using them, which will be discussed below.
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