[GRASS5] [bug #2397] (grass) v.clean dissolve problem for areas

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2397
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Subject: v.clean dissolve problem for areas

Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: GRAS 5.7 CVS from april 2004

This problem occured a couple ot weeks ago using v.extract, but according 
to Radim is a v.extract 'pseudo bug' and would have to be solved by v.clean.

  +----+------+
  | 1  |  2   |
  | c  |      |
  |    +--+ c |
  |    |c |   |
  |    |3 |   |
  +----+--+---+

v.extract 1,2: result:

  +----+------+
  | 1  |  2   |
  | c  |      |
  |    +--+ c |
  |    |  |   |
  |    |  |   |
  +----+--+---+

areas without centroid occur, because 
former area 3 still is surrounded by boundaries and 
2 areas but without centroid. To solve this, it would be necessary 
to add a dissolve functionality into v.clean to add former area 3 to 
one of the other areas (1 or 2).    

hope the problem becomes clear

  thanks
   Otto



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