[GRASS-user] Re: grass-user Digest, Vol 30, Issue 22

[Markus Neteler]

Michael,

I have no clue - AFAIK not.
I would vote to manage this in Addons (at least) for easier testing and
review.

Markus

On Thu, Oct 9, 2008 at 8:49 PM, Michael Barton <michael.barton at asu.edu> wrote:
> Markus,
>
> I thought this was already in the svn. Not?
>
> Michael
> ______________________________
> C. Michael Barton, Professor of Anthropology
> Director of Graduate Studies
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
> Tempe, AZ  85287-2402
> USA
>
> voice: 480-965-6262; fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>
> On Oct 9, 2008, at 9:00 AM, <grass-user-request at lists.osgeo.org> wrote:
>
>> Date: Thu, 09 Oct 2008 16:38:40 +0200
>> From: Markus Metz <markus_metz at gmx.de>
>> Subject: [GRASS-user] r.watershed.fast new version
>> To: grass-user at lists.osgeo.org
>> Message-ID: <48EE1770.502 at gmx.de>
>> Content-Type: text/plain; charset=ISO-8859-15
>>
>> Hi all,
>>
>> some time ago I posted a new version of r.watershed with substantial
>> speed increase, but still with slight differences in the outputs
>> compared to the original version. This problem is solved, whether or not
>> these differences in flow direction and flow accumulation were critical.
>> Now the results in flow direction and flow accumulation are 100%
>> identical to the original version. All other outputs are based on flow
>> direction and flow accumulation and therefore also identical.
>>
>> The speed increase for the ram version is the same as with my first
>> version: e.g. a region with 22,500,000 cells is processed in 1minute 6
>> seconds, the original version needs 10 hours. The modified seg version
>> (-m flag set) needs 16 minutes (North Carolina sample data, elevation
>> resampled to 3 m). No idea how long the original seg version needs for
>> such a region, more than a day I guess.
>>
>> The source code of r.watershed.fast available here
>> http://markus.metz.giswork.googlepages.com/r.watershed_fast_version.tar.gz
>>
>> If you give this modified version a try, please let me know if it works
>> or not, I tested it only on Linux 32bit and Linux 64bit.
>>
>> Markus
>
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