the amount of concentration. It defers from a chloropleth becase the boundries are aranged according to the data used.http://www.epa.gov/castnet/images/ph_map.gif
Sunday, November 23, 2008
isopleth
An example of an isopleth map showing hydrogen ion concentration as PH. Note the colors used to show the concentrations that equal across the USA. Shades of color are used to show 
the amount of concentration. It defers from a chloropleth becase the boundries are aranged according to the data used.
http://www.epa.gov/castnet/images/ph_map.gif
the amount of concentration. It defers from a chloropleth becase the boundries are aranged according to the data used.http://www.epa.gov/castnet/images/ph_map.gif
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