Choropleth
map is a thematic map in which areas are shaded or patterned in proportion to
the measurement of the statistical variable being displayed on the map, such as
population density or per-capita income. The choropleth map provides an easy
way to visualize how a measurement varies across a geographic area or it shows
the level of variability within a region. A Classed Choropleth Map shows data combined into a smaller number of
groups, which is then portrayed in intervals. The choice of the number of
groups affects the resulting map greating. Some formal classification
techniques include equal step classification, classifying by quantiles, natural
break classing, and minimum variance classification. The map above is an
example of this. The data is broken into four class and these classes are based
on equal intervals.
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