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@grr.ulaval.ca
v.cutter doesn't work properly, and up to now I know no way of
doing polygon overlay. I'm studying some computational geometry
and some good article in order to implement vector analysis
in GRASS 5.1, but up to now I didn't found the time to write
a line of code... sorry
Regards
Andrea Aime
Robert Lagacé wrote:
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@grr.ulaval.ca
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