Tue, May 4 2004
12:06:49
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Request created by guest
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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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Tue, May 4 2004
19:21:35
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From |
Radim Blazek <blazek@itc.it>
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To |
Request Tracker <grass-bugs@intevation.de>, grass5@grass.itc.it
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Subject |
Re: [GRASS5] [bug #2397] (grass) v.clean dissolve problem for areas
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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
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Sat, May 29 2004
11:26:34
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Status changed to resolved by hbowman
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Sat, May 29 2004
11:27:17
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Comments added by hbowman
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'v.extract -d' now works.
Hamish
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