From grass-lists-owner@max.cecer.army.mil Thu Jul 22 07:20:56 1993
Date: Thu, 22 Jul 93 10:08:10 EDT
From: albanir@ocean.rutgers.edu (Alan Albanir)
Sender: grass-lists-owner@max.cecer.army.mil
Reply-To: grassu-list@max.cecer.army.mil
To: grassu-list@max.cecer.army.mil
Subject: v.patch
Content-Length: 550We have two 7.5 minute quad based vector maps. When we use
v.patch to join these maps, we get unattached labels. When we adjust
the snapping threshold in v.support, we get the maps to edgematch
correctly, but we get more unattached labels and labels that dont show
up anywhere. When the maps are seperate, they seem to be fine showing
no errors in v.digit or support.
We are able to bring these maps into arc/info and patch them
together just fine, but we dont want to keep doing this. Any help
would be appreciated.ALAN
Have you tried running
v.spag -i map=mapname threshold=0
If your quads have the outline of the quad boundary, then patching them
will give double lines along the patch seam. Double lines will cause
point to area failures. v.spag will get rid of the extras. If you want
to get rid of them all together you can use v.reclass with the -i
option, reclassing all categories to themselves (1=1, 2=2, etc.) That will
dissolve the internal quad boundaries. I generally get double labels
from that, but so long as the labels are the SAME, it doesn't hurt
anything, and you can get rid of the extra label in v.digit.