An index value plot is one that you can view different variations in different situations. A good example of an index value plot would be any map that deals with different figures relating to stream flow or different vibrations related with a seismograph relating to a weather phenomenon such as an earthquake. This graph represents all the different variations of stream flow of different streams in North Carolina since July of 1999.
http://waterwatch.usgs.gov/regplots/real/real_nc_2.gif
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