[GRASS-user] Vector Overlay Issues

Maris Nartiss maris.gis at gmail.com
Thu Feb 14 05:32:27 EST 2008


Can somebody look on those data?
I used v.overlay with "and/or" and also got some strange results - not
what I expected. There must be something strange in that vector
dataset/how GRASS understands it.

Maris.


2008/2/13, Eddie <eddie at mailforce.net>:
> Someone sent me an E-mail regarding my use of HTML in the previous
> message and I'm sorry about that. Always learning. Allow me to re-phrase
> in plain text.
>
> I have been struggling for quite some time trying to make a land use
> vector map out of two separate vector maps. One is water and the other
> is vegetation. Both only contain areas, and those areas which are active
> are set to a single category value (1 for water, 2 for vegetation).
> Islands are valid areas with no category id. I have tried the following
> two approaches
>
> v.patch input=water,vegetation out=landuse
> v.overlay ainput=water atype=area binput=vegetation btype=area
> output=landuse operator=or
>
> to no avail. The results is always something bizarre that I haven't
> quite figured out the meaning of. Certainly not what one would expect.
> Both maps appear to be topographically correct. I have uploaded a
> tar.bz2 of the project file at
> (http://eddie.alcazarmountain.com/kootenay.tar.bz2). I removed all the
> other map files leaving only the two vector maps and a region setting.
> It is only about two megabytes. I am running {GRASS 6.2.1 (2006)} on
> {Linux spica 2.6.23-gentoo-r6 #1 Mon Jan 28 11:06:48 MST 2008 x86_64
> Mobile AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux}.
>
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