Hi, sth like this can also be of help: v.db.addcol map=yourVectorMap column="area_size double precision" v.to.db map=yourVectorMap type=centroid option=area units=h column=area_size
Regards On Mon, Jan 30, 2012 at 6:44 PM, Michael Barton <michael.bar...@asu.edu>wrote: > Use v.report - under the vector/reports menu > > Michael > ____________________ > C. Michael Barton > Director, Center for Social Dynamics & Complexity > Professor of Anthropology, School of Human Evolution & Social Change > Arizona State University > > voice: 480-965-6262 (SHESC), 480-727-9746 (CSDC) > fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC) > www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu > > > > > On Jan 30, 2012, at 10:00 AM, <grass-user-requ...@lists.osgeo.org> wrote: > > > Date: Mon, 30 Jan 2012 17:52:40 +1000 > > From: Shane Litherland <litherland-f...@bigpond.com> > > Subject: [GRASS-user] how to report/measure a vector area? > > To: grass-user@lists.osgeo.org > > Message-ID: <1327909960.6375.15.camel@Lacebark> > > Content-Type: text/plain; charset="UTF-8" > > > > Hi all, > > > > I'm lost. I have looked around in GRASS for how to report the area (e.g. > > in hectares) for a vector map that, yes, has area (i.e. centroids and > > boundaries). > > > > I cannot find a way to do this. A bit of web searching, even gave some > > suggestions this basic facility may not be available in GRASS?? surely > > there's something tucked away to do it? > > > > I'm sure I've done something in the past to view vector area data, > > though it may have been area data that was already in a table. When I > > use the query tool in map display, it tells me 'nothing'. Seems that is > > because my vector is not connected to an attribute table. For the > > purpose of my exercise I did not need cats for the boundaries/centroids > > so I didn't bother with a table connection either. Maybe this is where > > I've gone wrong? > > > > I did try vector to raster to try and report on how many raster > > cells/area... no luck there either. > > > > I also tried the 'measure' tool in the map display, but it only gives > > distance. > > > > > > I could go and learn more about PostGIS for sending the vector data to a > > postgres geometry table and figure it out that way... I was hoping to > > find a way to do it in GRASS in a matter of minutes, not via a database > > and a couple of days/weeks of learning how... > > > > What tool/command should I be using? > > > > regards, > > Shane. > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user > -- Ismael G. Ingeniero de Caminos (UPM). Ingénieur des Ponts et Chaussées (ENPC). PhD researcher @ Urban & Land Planning Department @ ETSICCPM UPM www.caminos.upm.es +34 91 336 67 83
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