Sounds simple, but I think it may be tricky. 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 Michael On 9/18/07 3:57 AM, "Patton, Eric" <[EMAIL PROTECTED]> wrote: > Sorry; I'll clarify. I meant how to find the number of vector maps, regardless > of vector type, that overlay a given region. I'm really only interested in the > map names. > > ~ Eric. > > > -----Original Message----- > From: Michael Barton [mailto:[EMAIL PROTECTED] > Sent: Mon 9/17/2007 4:25 PM > To: Patton, Eric; [email protected] > Subject: Re: [GRASS-user] How to find all vectors that overlay a given region > > It also depends on what you mean by 'how many vectors'. Number of points, > lines, segments, areas, centroids, etc. v.info gives some of this > information. > > Michael > > > On 9/17/07 11:29 AM, "Patton, Eric" <[EMAIL PROTECTED]> wrote: > >> Hi, >> >> I'm trying to find out how to determine how many vectors in an entire mapset >> overlay a given region. What is the best approach to do this - import the >> current region as a vector using v.in.region (type parameter as area), then >> run v.select on every vector in the mapset in a loop, or is there a better >> way? I see that v.overlay/v.select takes one map as input for both the ainput >> and binput parameters. >> >> How hard would it be to change the structures in v.select to accept multiple >> inputs, or is this even feasible? >> >> Thanks, >> >> ~ Eric. >> >> > > __________________________________________ > Michael Barton, Professor of Anthropology > Director of Graduate Studies > School of Human Evolution & Social Change > Center for Social Dynamics and Complexity > Arizona State University > > phone: 480-965-6213 > fax: 480-965-7671 > www: http://www.public.asu.edu/~cmbarton > > __________________________________________ 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 _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
