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Isopleth maps show a range of quantity. They show data as a third dimension on a map, making them good for mapping surface elevations or for weather data. Radar maps, temperature maps and rainfall maps are all isopleth maps.
Isopleth maps usually have ranges of similar value filled with similar colors or patterns, showing changes over space. The third dimension is shown by a series of lines called isopleths which connect points of equal value.
Isopleth maps differ from choropleth maps in that the data is not grouped to a predefined region like a state or country. Temperature, for example, works better as an isopleth map than a choropleth map because temperature is continuous but does not change abruptly at any point.
Isopleth maps also require a large amount of data for accurate drawing.
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