Isolines, found within an isoline map, join points of equal value on a surface; the lines that connect at specific locations represent an equivalence in data value. This is also known as a contour map, where the contour interval is the distance between contour lines. Isoline maps are maps that show three dimensions on a two dimensional plane and use color and shading and also circles to show deterioration in certain areas.
The image above is an isoline map of North America showing where temperatures are relatively high and low, and also where temperature changes are gradual or dramatic over a distance.
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