| Choropleth |
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Information AboutChoropleth |
| CATEGORIES ABOUT CHOROPLETH MAP | |
| cartography | |
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Population distribution is usually highest around Conurbation areas and therefore these are shaded darker than sparsely populated areas to represent the high density population. Sparsely populated areas are usually shaded lighter. On choropleths using patterned representations, the key usually denotes which areas are more densely or undensely populated than others. Broadly speaking choropleths represent two types of data: Spatially Extensive or Spatially Intensive. Spatially Extensive data are things like populations. The population of England might be 40 million, but it would not be true to cut England in half and say that the population of half of England is 20 million. Spatially Intensive data are things like rates, densities and proportions. These can be thought of conceptually as field data that is averaged over an area. When producing a Choropleth the Cartographer must choose appropriate colours or grey-shades to represent the different classes of data being mapped. Choroplethic Maps are now commonly produced by Geographic Information Systems that automate many of these processes. |
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