[GRASS-user] [Fwd: grass-user Digest, Vol 39, Issue 93]

[Richard Chirgwin]

>
> ------------------------------
>
> Message:  
> Date: Thu, 30 Jul 2009 19:22:04 +0100
> From: Corrado Topi <ct529 at york.ac.uk>
> Subject: [GRASS-user] which points in vector A fall in areas of vector
> 	B?
> To: grass-user at lists.osgeo.org
> Message-ID: <200907301922.04877.ct529 at york.ac.uk>
> Content-Type: text/plain;  charset="us-ascii"
>
> Dear friends,
>
> I need to discover which points out of vector A fall within the area covered 
> by vector B (areas). How do I do that? I tried v.select and v.overlay, but 
> without success.
>
> Best Regards
> -- 
> Corrado Topi
>
> Global Climate Change and Biodiversity
> Area 18,Department of Biology
> University of York, York, YO10 5YW, UK
> Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>
>   
Corrado,

v.distance from=<from_map> from_type=point to=<to_map> to_type=area 
dmax=0 upload=dist column=<column_name>

Points falling within the areas will have a zero placed in the target 
column. You can then query the attribute table to choose points falling 
within the area, and use v.extract to create a new map of points within 
the areas.

Richard