Choropleth mapping is means place and value. It content two components which is base map and attribute data (statistical data). This method is one of the most popular of quantitative thematic maps. The symbol is following the boundaries in the choropleth mapping. The objective of this mapping is to show the quantities within administrative unit areas. It employs area symbols to show the spatial distribution of the geographic phenomena. The problems with this method are making an easy way to slant data to suit the purpose of map by adjusting the values. It also by creating the illusion of rapid breaks where data varies continuously and gradually in the real world. Finally it allows small areas to cover the large region data.
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