v.support WARNING message

[Susan Stitt]

  >Date: Wed, 17 Jan 1996 13:57:42 UTC+0200
  >From: Agustin Lobo <alobo at ija.csic.es>
  >Subject: v.support WARNING message
  >Reply-To: grassu-list at moon.cecer.army.mil
  >To: grassu at max.cecer.army.mil
  >
  >What does the following message means? 
  >Does it mean that the label of area 244 (which is 273) 
  >is the same that the label of area 274?
  >
  >v.support usos.proj_v    
  >
  >
  >   V.SUPPORT:
  >
  >
  >Selected information from vector header
  > Organization:  
  > Map Name:      usos_v
  > Source Date:   
  > Orig. Scale:   0
  > No snapping will be done 
  >
  >    Reading Vector file.
  > 100%
  >    Building areas
  >    Building islands
  >    Attaching labels
  >WARNING: area 10116 label: 1 matched another label: 258.
  >WARNING: area 244 label: 273 matched another label: 274.
  >WARNING: area 9981 label: 4200 matched another label: 4213.
  > Number of lines:   27150
  > Number of nodes:   18291
  > Number of areas:   10116
  > Number of isles:   1257
  > Number of atts :   10115
  > Number of unattached atts :   0
  > Snapped lines  :   0
  >
  >Thanks
  >
  >Agus
  >***************************************************
  >Dr. Agustin Lobo
  >Instituto de Ciencias de la Tierra (CSIC)
  >Marti Franques s/n
  >08028 Barcelona (Spain)
  >
  >tel. 34 3 330 2716
  >fax. 34 3 411 0012
  >
  >alobo at ija.csic.es
  >alobo at eno.princeton.edu
  >***************************************************
  >

No, It means that area 244 has two label points which
fall inside it, and therefore the software is trying to
attach two labels to that polygon.  One label point has 
an attribute of 273, and one has an attribute of 274.  
Likewise, area 10116 has an attribute point label of 1, 
and another of 258. These messages should be considered
as a warning of something odd going on inside the file,
if some polygons are not being assembled properly, or there
are polygons which are too small relative to the resolution
set on the vector file (adjustable on the initial screen when
you enter v.digit), you might get some of these errors, 
but the most common cause is from an area being labeled
twice.

If the three areas in question currently have the
attributes which you wish them to have, you can ignore 
the messages.  If you wish to get rid of the messages,
you need to change something in the file while within
v.digit, such as unlabel, and relabel a polygon.  When
you exit v.digit, it will then ask you :                                     |
|Do you want to compress the Atts file? [n]   
if you answer yes, the software will then remove from the 
attribute file any currently unattached attributes, and 
the next time you run v.support you should not have any 
doubly labeled areas.  

If you wish the area to have the attribute which is NOT
currently being used, but has been dropped, you will need
to either unlabel or relabel with the correct value, the area 
from within v.digit, then get out and run v.support.  If you 
relabeled, then answer yes to the compression question when
you exit v.digit.  If you unlabeled, the area will appear to
have no label until you get out of v.digit (answering no
to the compression question) and run v.support, then the
previously dropped attribute should be the only attribute
attached to the polygon.

There is a debug menu inside of v.digit, it is
accessable by typing a "-".  It will help in locating 
particular polygons and confirming what they are 
currently labeled. 

Susan Stitt
National Biolgical Service
Technology Transfer Center
sstitt at its.nbs.gov