[GRASS-user] Random points within a polygon?

GRASS GRASS user
1

hi,

I want to use v.random but I noticed it puts random points within the
region, can I limit this to a polygon?

Thanks

Gary
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2

Gary wrote:

I want to use v.random but I noticed it puts random points
within the region, can I limit this to a polygon?

Yes, see the v.random.cover addon script from wiki addons.

Also there are many options available from the R statistics "sp"
library. (see the R page in the grass wiki, once loaded do
library(sp); demo(gallery).

And of course the "spgrass6" R-GRASS interface to transfer data.

Hamish

3

On Thursday 18 March 2010, Hamish wrote:

Gary wrote:
> I want to use v.random but I noticed it puts random points
> within the region, can I limit this to a polygon?

Yes, see the v.random.cover addon script from wiki addons.

Also there are many options available from the R statistics "sp"
library. (see the R page in the grass wiki, once loaded do
library(sp); demo(gallery).

And of course the "spgrass6" R-GRASS interface to transfer data.

Here is an example of exactly what Hamish suggested:

http://casoilresource.lawr.ucdavis.edu/drupal/node/644

Note that you can substitute readOGR() with readVECT6() to read in a grass
vector file.

Cheers,
Dylan

--
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341

4

Brilliant! just what i need!

Thanks

Again :slight_smile:
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