r.viewshed Computes the viewshed of a point on an elevation raster map. Raster (r.*) ParameterRaster|input|Elevation|False ParameterString|coordinates|Coordinate identifying the viewing position|0,0 ParameterString|observer_elevation|Viewing position height above the ground|1.75 ParameterString|max_distance|Maximum distance from the viewing point (meters)|10000 ParameterBoolean|-c|Consider earth curvature (current ellipsoid)|False OutputRaster|output|Intervisibility