Isopleth Map





http://dwb4.unl.edu/Chem/CHEM869V/CHEM869VLinks/weather.about.com/newsissues/weather/library/weekly/aa071600a.htm

Isopleth maps are useful because they are used to simplify data which is continuously distributed across a land area.  The map provided shows nitrate ion concentration throughout the United States during 1998.  The different amounts of data show variance through the use of colors.  Red represents the higher of concentrations with the highest concentration being in Michigan with a concentration of 2.0 mg/L.  By using the different points of data and color this map can be considered an isopleth map.