<P> Map coloring is the act of assigning different colors to different features on a map . There are two very different uses of this term . The first is in cartography, choosing the colors to be used when producing a map . The second is in mathematics, where the problem is to determine the minimum number of colors needed to color a map so that no two adjacent features have the same colour . </P> <P> Color is a very useful attribute to depict different features on a map . Typical uses of color include displaying different political divisions, different elevations, or different kinds of roads . A choropleth map is a thematic map in which areas are colored differently to show the measurement of a statistical variable being displayed on the map . The choropleth map provides an easy way to visualize how a measurement varies across a geographic area or it shows the level of variability within a region . </P> <P> Displaying the data in different hues can greatly affect the understanding or feel of the map . Also, the cartographer must take into account that many people have impaired color vision, and use colors that are easily distinguishable by these readers . </P>

Why are countries different colours on a globe
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