Provided by: grass-doc_7.4.0-1_all 

Topic: viewshed
r.viewshed Computes the viewshed of a point on an elevation raster map.
See also the corresponding keyword viewshed for additional references.
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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual
GRASS 7.4.0 topic_viewshed(1grass)