According to one of our reading assignments, an isopleth is a line of equal value and contouring is the process of drawing isopleths. Several of the previous maps collected for my project could fall into this category. I think isobars, isotachs, isohyets and isopachs would all be considered isopleths. These maps are commonly used for mapping surface elevations, amounts of precipitation, atmospheric pressure, and numerous other measurements that can be viewed statistically as a third dimension. The map I have chosen is a good illustration of isopleth lines showing field pH levels recorded across the United States. It is listed by the North Fork Watershed Association in Brookville, PA as an example in the study of acid deposition and its relation to air pollution.Link to website source:
http://nfwatershed.org/templates/System/details.asp?id=40322&PID=490669
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