[GRASS5] Overlay of maps

[Robert Lagacé]

We would like to overlay polygons (intersection) to create new maps.  In the 
process to test GRASS for this purpose, we build simple maps of a few polygons 
(less than 5) by hand.  We import them with v.in.ascii and run v.support.

v.patch build new maps putting together all the polygons but not intersecting 
them.  v.cutter go weird trying with a map of three polygons and another of 
one polygons feeding us with the following message :

Building intersection table
Building new polygons   GOT TO WEIRD STUFF
GOT TO WEIRD STUFF
. . .
[snip of lines and lines]
GOT TO WEIRD STUFF

We need to stop v.cutter.

Is there any other ways to overlay polygons in GRASS?

What need to be done?

-- 
Robert Lagacé, professeur
Pavillon Comtois
Université Laval
Ste-Foy, Québec, G1K 7P4
tel : (418)-656-2131#2276
Fax : (418)-656-3723
E-mail : lagace at grr.ulaval.ca