[GRASS-user] r.surf.area

[Valter Albino]

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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