An Isopleth is a map that portrays similar data through the use of shading regions with similar values in similar colors, and are best for showing the gradual change over a period of time. This particular isopleth shows the precipitation in June in Barcelona in the year of 2000. It is easy to depict the various meters of rain that fell throughout Barcelona, and the areas with more concentrated rainfall, however, it would be difficult to see if the rainfall was not continuous or if it was abrupt given the slight change in shading.
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