A to Z GIS | Explore this related guide, featuring updated terms and graphics and developed in coordination with Esri’s GIS Dictionary team.
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isogram
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[symbology]
A line that connects points of equal value on a map, such as elevation, temperature, or pressure. Isograms are typically used to illustrate data ranges across a surface, indicating where values increase or decrease through line spacing. Common examples of isograms include contour lines, isotherms, and isobars.