Isopleth
is a line on a map connecting places registering the same amount or ratio of
some geographical or meteorological phenomenon. An isopleth is also known as a
contour line. It is a feature of some charts and maps, connecting points, which
have an equal value of some, variable at a given time and spatial area. They
are used to assist in visualizing the general features of an area. Above is an
illustration of the construction of an isopleth map.
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