Hi,
I experienced that r.thin handles only integer values (GRASS 6.5 SVN). Is that
simply a methodological issue which needs to be in that way? Or will there be
changes in future releases where r.thin also uses floats (double precision)?
In my case I use v.to.rast to populate a raster with comma
er wrote:
From: Micha Silver
Subject: Re: [GRASS-user] r.thin ?
To: "charlie"
Cc: grass-user@lists.osgeo.org
Date: Tuesday, November 9, 2010, 1:53 PM
On 11/09/2010 06:2
wrote:
From: Hamish
Subject: Re: [GRASS-user] r.thin ?
To: "charlie"
Cc: "GRASS user list"
Date: Wednesday, November 10, 2010, 6:02 AM
charlie wrote:
> In response to your questions, I am trying to convert a raster
> map (a scanned & georeferenced map with only XY dat
charlie wrote:
> In response to your questions, I am trying to convert a raster
> map (a scanned & georeferenced map with only XY data)
> with a shoreline and some wetland islands into a vector map
> so I can compare gains/losses over time.
>
> A preview of the map is here:
> http://historicalchar
2010/11/9 Micha Silver
>
> On 11/09/2010 06:21 PM, charlie wrote:
>
> Micha and Achim, thank you for the replies. In response to your questions, I
> am trying to convert a raster map (a scanned & georeferenced map with only XY
> data) with a shoreline and some wetland islands into a vector map
On Tue, 11/9/10, Micha Silver
wrote:
From: Micha Silver
Subject: Re: [GRASS-user] r.thin ?
To: "charlie"
Cc: grass-user@lists.osgeo.org
Date: Tuesday, November 9, 2010, 5:24 AM
charlie wrote:
the features borders quite well, however only 50% of the map was
completed.
I bumped the iterations up to 6000, it completed in 4200, but it seemed that it
thinned the entire map down to a 1px line.
Thanks
--- On Tue, 11/9/10, Micha Silver
wrote:
From: Micha Silver
Subject: Re: [GRASS-user] r.
charlie wrote:
Hi. I am currently using Grass 6.4 on linux and beginning the the
process of vectorizing an old NOAA raster map with r.thin. The map is
approximately 12,000 pixels by 8,000 pixels wide.
According to this post, (
http://osgeo-org.1803224.n2.nabble.com/r-thin-td2718260.html#a27
Hi,
how do you use r.thin? Can you post the complete command?
Am 09.11.2010 06:25, schrieb charlie:
Hi. I am currently using Grass 6.4 on linux and beginning the the
process of vectorizing an old NOAA raster map with r.thin. The map is
approximately 12,000 pixels by 8,000 pixels wide.
Accordi
Hi. I am currently using Grass 6.4 on linux and beginning the the process of
vectorizing an old NOAA raster map with r.thin. The map is approximately 12,000
pixels by 8,000 pixels wide.
According to this post, (
http://osgeo-org.1803224.n2.nabble.com/r-thin-td2718260.html#a2718260 )the
iterat
On Jun 11, 2009, at 12:50 AM, Dwight Needels wrote:
On Jun 11, 2009, at 12:01 AM, Dwight Needels wrote:
On Jun 6, 2009, at 11:36 PM, Dwight Needels wrote:
Hi all. I have run into a quirk using r.thin, but I am not sure
whether or not it is a bug. I have a raster that was generated
from mu
On Jun 11, 2009, at 12:01 AM, Dwight Needels wrote:
On Jun 6, 2009, at 11:36 PM, Dwight Needels wrote:
Hi all. I have run into a quirk using r.thin, but I am not sure
whether or not it is a bug. I have a raster that was generated from
multiple GPS tracks using v.rast followed by r.buffer. U
On Jun 6, 2009, at 11:36 PM, Dwight Needels wrote:
Hi all. I have run into a quirk using r.thin, but I am not sure
whether or not it is a bug. I have a raster that was generated from
multiple GPS tracks using v.rast followed by r.buffer. Using r.thin
followed by r.to.vect creates a vector t
Thanks, Juan.
This worked. Not exactly the result I expected (resulting vector layer far
too simplified) but it worked ;-)
All the best.
Danny
On Sun, Apr 26, 2009 at 9:04 PM, Juan Carlos Torres Cantero wrote:
> Danny
>
> The algorithm run an iterative process. At each step its remove externa
Danny
The algorithm run an iterative process. At each step its remove external cells
from the feature, and test if the result is correct. The parameter you must
enter to "iterations" is half the number of cell of your wider line on the
map.
Juan Carlos Torres
On Sunday 26 April 2009 17:47:55
Hi,
I'm trying to use r.thin before running r.to.vect.
The man page says to use the thickness as parameter for *iterations*.
I'm not sure I understand what it means by "thickness".
Any ideas?
Many thanks,
Danny
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