Isopleths are yet another form of contouring. This type measures data in an area rather than a specific point. For example, isopleths would be used for population density. Actually this type of mapping will probably be very useful this year since the 2010 Census was just mailed back.
https://users.cs.jmu.edu/bernstdh/web/common/lectures/slides_cartography-and-geodesy.php
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