Hi GRASS members Suppose you compute the "r.surf.area"(1) to some raster file and find that the 3d area is smaller than your 2d area? What could be the problem? Note: The exercise was done with a 5 m cell size raster file, with 37 km2 watershed with a slope of 0,0341 m/m, within 7.8 version of GRASS GIS 7.8 console in a 3.12.3 QGIS [with this method the difference is higher (12 ha, comparing with ArcGIS)] and outside QGIS, in GRASS GIS GUI Thanks in advance
(1) https://grass.osgeo.org/grass78/manuals/r.surf.area.html Cumprimentos, *Valter Albino -* Geógrafo Físico, M.Sc. Modelação H&H / Riscos ambientais / OT&U www.valteralbino.wixsite.com/hydrodynamics
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