r.accumulate: Efficient computation of hydrologic parameters in GRASS
summary
Describes a new algorithm that uses Hack’s law to find the longest flow path in watershed analysis and its implementation as a GRASS GIS module named r.accumulate. Compares r.accumulate’s performance against ArcHydro’s Longest Flow Path tool, and shows a proof-of-concept web hydrologic modeling system (WHydroMod) built with GRASS, PyWPS, MapServer, and OpenLayers that uses r.accumulate to speed geospatial computation.
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