[GRASS-user] Interactively Adding Polygon Attributes to, Centroid

GRASS GRASS user
1

On 11/10/12 6:00 AM, grass-user-request@lists.osgeo.org wrote:

Message: 9
Date: Wed, 10 Oct 2012 07:52:41 -0700 (PDT)
From: Rich Shepard<rshepard@appl-ecosys.com>
To:grass-user@lists.osgeo.org
Subject: [GRASS-user] Interactively Adding Polygon Attributes to
  Centroid
Message-ID:
  <alpine.LNX.2.00.1210100747230.21088@salmo.appl-ecosys.com>
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII

    A vector map of townships and ranges (part of the US Public Land Survey
System, PLSS) was poorly digitized. Some of the polygons lack attributes and
labels. They have a category number when I click on the centroid, but
there's no row in the associated attribute table for that polygon.

    I do not see a way to add the row to the displayed attribute table; nor
does it appear that v.category will allow me to add this information
interactively to those specific polygons that are lacking.

    If there is a module or way of using the display (in editing mode,
perhaps?) I would appreciate learning how to do this task.

Rich

Rich -

So as to preserve the info you already have, why not add a second table to the map, ie
v.db.addtable layer=2 etc?

This should have rows for everything that's got categories.

You could then create a copy of the old map, and use v.distance to populate the new table with the information you already have.

Then you can fill in the blanks (that is, centroids with rows in the table but no information associated with them), however is most efficient to you.

Cheers,
Richard Chirgwin