Example Categorical Maps

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Like a quantitative map, a categorical map can be based on a scale or intensity range.  The first example below illustrates this type of categorical map. (The first example also illustrates the use of special classes, in this case two special classes for “*” and “NA” values.) Categorical maps that are not based on a scale or intensity range are called qualitative maps (second example). Four color palettes are reserved for qualitative categories.