[GRASS-user] Re: grass-user Digest, Vol 40, Issue 40

GRASS GRASS user
1

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Today's Topics:

   1. attribute info attached to multiple areas (Sharon M)
   2. creating map series purely on ps.map (maning sambale)
   3. Re: creating map series purely on ps.map (Hamish)
   4. v.to.rast error? (Paolo Cavallini)
   5. magic? (achim)
   6. Re: v.to.rast error? (Hamish)
   7. Re: v.to.rast error? (Paolo Cavallini)
   8. Re: magic? (achim)

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Message: 1
Date: Thu, 20 Aug 2009 09:44:34 +0930
From: Sharon M <morrisxs09@gmail.com>
Subject: [GRASS-user] attribute info attached to multiple areas
To: grass-user@lists.osgeo.org
Message-ID:
  <7a0cde410908191714ja3439dbw36f1c112428157ca@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Hi,

I'm using WinGRASS-6.4.0SVN-r38537-1 (on Windows XP) and imported a
.MIF/.MID files via v.in.ogr using default settings. I get the
following message

"6 areas represent more (overlapping) features, because polygons
overlap in input layer(s). Such areas are linked to more than 1 row in
the attribute table. The number of features for those areas is stored
as category in layer 2."

I've identified one of these (overlapping) areas and found the vector
data contains an area completely surrounding another area. The problem
is the outside area's attribute information is also being attached to
the inside area - how can this association be removed as the inside
area has it's own attribute information?

Any help would be appreciated.

Thanks,

Sharon
  

Sharon,

Since you don't have that many areas to deal with, you could do it manually. What you want to do is get the outside area without the inside area - the doughnut without the hole!

For example, in v.digit you could attach a centroid to the outside area, and then fill in its information from the database.

Richard Chirgwin