Isopleth maps group information into a
pre-defined unit. To interpret the data the information must be collected along
the contour lines and then calculated. The information displayed along the map
is gradual and will not show any abrupt changes and do not intercept onto
another line.
The example map shows the construction of an
Isopleth map.
Reference URL: http://www.fao.org/DOCREP/003/T0446E/T0446E06.htm
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