http://personal.uncc.edu/lagaro/cwg/color/color_symbol.html - select Good Single Hue Choropleth Map
Classed choropleth maps differ from unclassed choropleth maps in
that there is not an unlimited amount of intervals, and the intervals are
clearly defined. This map of North
Carolina is showing expenditures per pupil for public education between the
years of 1994 and 1995 using a single-hue graded series. Darker shades represent a larger
expenditure, and lighter shades represent smaller expenditures – the five
classes are on the left in a legend.
It seems that the largest expenditures were in the northeast and the
west of the state.
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