[GRASS-user] Re: GRASS-user] how to report/measure a vector area?

[Ismael Gómez]

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.Barton at 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-request at lists.osgeo.org> wrote:
>
> > Date: Mon, 30 Jan 2012 17:52:40 +1000
> > From: Shane Litherland <litherland-farm at bigpond.com>
> > Subject: [GRASS-user] how to report/measure a vector area?
> > To: grass-user at lists.osgeo.org
> > Message-ID: <1327909960.6375.15.camel at 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.
>
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-- 
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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