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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[symbology]
A line that connects points of equal precipitation (rainfall) on a map. Isohyetal maps are created by interpolating discrete data collected from rain gauge stations to create a continuous surface. These maps are used in industries such as urban planning and disaster management to analyze precipitation patterns and estimate average rainfall across a catchment area.