An isopleth map generalizes and simplifies data with a continuous distribution. It shows the data as a third dimension on a map, thus isopleth maps are more common for mapping surface elevations, amounts of precipitation, atmospheric pressure, and numerous other measurements that can be viewed statistically as a third dimension. Specifically, an isopleth is a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon. The map above shows isopleths of mold germination and growth rate. As you can see, the wetter a surface the quicker mold spores will germinate and the quicker they will grow. Typical room temperatures of 21 degrees Celsius are about ideal for mold growth.
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