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

[Michael Barton]

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.