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GIS fundamental - Choropleth Maps Areas with shading...

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Choropleth Maps Areas with shading applied to represent the magnitude of a quantitative variable
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Example: Choropleth Mapping Data should be AREA (e.g. states, counties) Boundaries unambiguous. Areas non-overlapping. Elevation? Temperature? Population density by census tract?
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Choropleth Maps Data assumed to be “uniform” throughout an enumeration unit (often a not true) Full range of data should be used and classes should not overlap Shadings should be easily distinguishable Often no more than six or seven classes are used
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Classifications for Choropleth Map Equal Interval Natural groups N-tiles Equal or unequal? Logarithmic? Linear? Discontinuous? How many classes? Non-overlapping, distinctive groups.
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Areal tables are hard to interpret. Patterns and processes are not evident.
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Choropleth maps re-assign tabular statistical data, collected for areas, to ordinal classes that are then given a shade.
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Typically do not want to map raw numbers Standardize by total or area.
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