Details Ticket 2397


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Serial Number 2397
Subject v.clean dissolve problem for areas
Area grass5.7
Queue grass
Requestors otto.dassau@gmx.de
Owner none
Status resolved
Last User Contact Tue May 4 19:21:35 2004 (4 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Sat May 29 11:27:17 2004 (4 yr ago)
Created Tue May 4 12:06:49 2004 (4 yr ago)

Transaction History Ticket 2397


Tue, May 4 2004 12:06:49    Request created by guest  
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

Tue, May 4 2004 19:21:35    Mail sent by blazek@itc.it  
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From Radim Blazek <blazek@itc.it>
To Request Tracker <grass-bugs@intevation.de>, grass5@grass.itc.it
Subject Re: [GRASS5] [bug #2397] (grass) v.clean dissolve problem for areas
Date Tue, 4 May 2004 19:21:30 +0200
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On Tuesday 04 May 2004 12:06, Request Tracker wrote:
> this bug's URL: http://intevation.de/rt/webrt?serial_num=2397
> -------------------------------------------------------------------------
>
> 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 |
>   |    |  |   |
>   |    |  |   |
>   +----+--+---+

This is obviously bug, correct is:

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

Are you sure that you get the wrong result above?
For me v.extract gives correct result.

> 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

No, not for me. What did I say about 'pseudo bug', dissolve functionality and
v.clean?

Radim


Sat, May 29 2004 11:26:34    Status changed to resolved by hbowman  
Sat, May 29 2004 11:27:17    Comments added by hbowman  
'v.extract -d' now works.


Hamish
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