Statistical Map of Wetlands Reserve Program
Statistical maps which are used to display the distribution of a variable over a geographic area, usually defined by political boundaries.
In a statistical map, each unit is illustrated by a shading pattern or color that represents the value, or range of values for that unit of the variable. The shading density or the color changes from one value or range of values to another value or range of values. The statistics shown on are expressed as rates, ratios, percentages, or other statistical measures and indices, not absolute numbers or totals. Yet, no matter what statistical measure or index is used, values in the distribution must be mutually exclusive and exhaustive.
http://www.nrcs.usda.gov/programs/wrp/photos/ca_primeFar.gif
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