[GRASS-user] random points through multiple vector maps

[Dave Roberts]

Friends,

    Sorry, this DID work for points inside the polygon of interest.

    I guess I was too tired.

Dave

On 05/30/2014 05:42 PM, Dave Roberts wrote:
> Friends,
>
>     I am trying to drop random points through two vector maps to
> establish the correspondence between them.  I couldn't figure out how to
> do that with v.random so I created a database table with 10,000 random
> points within the bounds of the region, and then used v.in.db to bring
> the points in as a vector map.  Then I tried v.what.vect using the
> random points on a vegetation map, but v.what.vect failed as noted below
>
> v.what.vect map=rnd_points column=vmap_veg qmap=vmap qcolumn=vegtype
> Finding nearest features...
>   100%
> Update vector attributes...
>   100%
> 5049 categories - no nearest feature found
> v.distance complete. 10000 records updated.
>
> So 10,000 points were updated to NULL because no nearest feature was
> found.  Can somebody explain to me what went wrong or how to fix it?
>
> OS: 3.12.6-1-ARCH
> GRASS: grass70-svn
>
> Thanks, Dave

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
David W. Roberts                                     office 406-994-4548
Professor and Head                                      FAX 406-994-3190
Department of Ecology                         email droberts at montana.edu
Montana State University
Bozeman, MT 59717-3460