[GRASS-user] Using GRASS to solve the "Checking if a point (X, Y) is inside the, polygons of a shape file using command line."

[Corrado]

Dear friends,

Where do I find these files, like poly.c? I cannot find them on my 
installation. I have 6.2.3 on Ubuntu 7.10, with the grass-dev package 
installed. 

Do I have to use python?

I thought I could use a bash script.

On Tuesday 04 March 2008 16:45:47 Rick Reeves wrote:
> Hamish:
>
> Good point. For a large dataset such as Corrado's, it would be better to
> use GRASS,
> once Corrado surmounts the GRASS learning curve. R is a good alternative
> choice
> in that it is simpler to use.
>
> Regards, RR
>
> Hamish wrote:
> > Rick Reeves wrote:
> >> This is a good task for the R programming environment, which has
> >> strong geospatial tools and integrates with GRASS:
> >
> > FYI, in GRASS's vector library (available outside of C with e.g.
> > SWIG-Python) there a number of x-in-polygon functions found in
> > lib/vector/Vlib/poly.c. v.buffer uses such a test to check that its
> > centroid is inside the new area, you could trace that back if you
> > wanted to see the method in use.
> >
> > from GRASS modules there is v.select and 'v.distance dmax=0' (?) and
> > probably other ways too.
> >
> >
> > many roads,
> > Hamish
> >
> >
> >
> >      
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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