[GRASS-user] How to find all vectors that overlay a given region

[Michael Barton]

On 9/19/07 4:36 AM, "Hamish" <hamish_nospam at yahoo.com> wrote:

> Michael Barton wrote:
> 
>> Running v.info will give you the extents of a vector file. You can parse
>> this and compare the extents to the region extents to see if they overlap.
>> 
>> You could also use the approach I gave for finding the intersection of 2
>> raster maps.
>> 
>> parse g.region -ugp vect=vector1
>> parse g.region -ugp vect=vector2
>> 
>> compare the extents of the regions defined by the vectors with extents of
>> the current region
>> 
>> parse g.region -ugp
> 
> beware the case where the bounding boxes overlap but the vector features
> within
> do not. 

Good point. I don't know how to account for that since vectors are not a
continuous field.

Michael

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton