

r.poly - 

r.poly extracts \area\ edges from a \raster\ \map layer\ and converts
data to GRASS \vector\ format.  The program first traces the permieter
of each unique area in the raster map layer and creates vector data to
represent it.  The cell \category values\ for the raster map layer
will be used to create \attribute\ information for the resultant vector
area edge data.

Manual entry for \r.poly\
