Computer mapping software, specifically Geographic Information Systems (GIS), draws watershed boundaries very accurately by leveraging detailed elevation data to model the path of water flow across the terrain. The primary input for this process is a Digital Elevation Model (DEM), which is a raster data set where each cell, or pixel, represents a specific elevation value for a particular area on the Earth's surface. Higher resolution DEMs, meaning smaller cell sizes, capture finer terrain details and result in more accurate boundary delineation.
The process begins with a step called "filling sinks." Sinks are small depressions or pits in the DEM where the model predicts water would get trapped, preventing continuous flow. The GIS software identifies these sinks and ....
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