[GRASS-windows] Integrated viewshed analysis

[Helmut Kudrnovsky]

[maybe better asked in the grass-user ML]

>[...]
> how to extract the boundary of the visible area in vector format?

r.to.vect - Converts a raster map into a vector map layer:
(http://grass.osgeo.org/grass64/manuals/r.to.vect.html)

feature=string
    Feature type
    Options: point,line,area
    Default: line

HTH






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best regards
Helmut
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