[GRASS-dev] Re: [GRASS-user] v.clean tool=prune -'thresh' interpreted wrong?

Gordon Whitmore gordon.whitmore at rogers.com
Tue Oct 3 11:43:18 EDT 2006

How do I stop getting the "GRASS" e-mails.......
----- Original Message ----- 
From: "Maciej Sieczka" <tutey at o2.pl>
To: <grassuser at grass.itc.it>; <grass-dev at grass.itc.it>; "Radim Blazek" 
<radim.blazek at gmail.com>
Cc: "Markus Neteler" <neteler at itc.it>; "Moritz Lennert" 
<mlennert at club.worldonline.be>
Sent: Tuesday, October 03, 2006 9:56 AM
Subject: Re: [GRASS-dev] Re: [GRASS-user] v.clean tool=prune -'thresh' 
interpreted wrong?

> Markus Neteler wrote:
>> On Tue, Oct 03, 2006 at 02:23:56PM +0200, Moritz Lennert wrote:
>>> I would guess that the prune tool prunes all
>>> "unneccessary" nodes on a straight line, i.e. any node which is not
>>> necessary to define the line, and this whatever the threshold.
>>> The threshold only applies in cases of change of direction (i.e. 
>>> angles).
>>> Just another example of the need for much more documentation for
>>> v.clean, including example diagrams like the one for the rmsa tool.
>> Fully agreed...
> Markus,
> Agreed regarding what?
> Moritz just supposes but he is not sure. And if you look into my
> original email you'll that he's wrong:
> 1. a *straight* line, consisted of 4 vertices, at regular intervals of
>   10
> 2. thresh>0.03 prunes all vertices (besides the nodes of course)
> 3. thresh<=0.03 prunes none
> Then Moritz's idea is wrong.
> And I need to know exactly how the thresh in prune works, as I'm using
> it for my work. The result will be a script that I'm going to publish.
> Please - if anybody knows, tell me. I'd love to update the manual
> accordingly.
> Maciek
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