[GRASS-dev] r.walk/r.cost/r.drain updates

Michael Barton michael.barton at asu.edu
Thu Dec 11 15:22:02 EST 2008


This is great. These are important modules and their operation has  
been somewhat murky. I'm really glad that you found out about the  
errors in r.drain AND found a way to fix them.

Michael


On Dec 11, 2008, at 10:00 AM, <grass-dev-request at lists.osgeo.org> <grass-dev-request at lists.osgeo.org 
 > wrote:

> Date: Thu, 11 Dec 2008 09:30:20 -0500
> From: "Colin Nielsen" <colin.nielsen at gmail.com>
> Subject: [GRASS-dev] r.walk/r.cost/r.drain updates
> To: grass-dev <grass-dev at lists.osgeo.org>
> Message-ID:
> 	<d4e057e20812110630q15fc54f4x70878eb33eb4070f at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi developers,
> I have updated the r.walk, r.cost and r.drain modules to include
> "back-link raster" functionality. Currently the path created by
> r.drain does not necessarily take THE path through a cost surface,
> that the cost accumulation algorithm took to generate that cost
> surface. My updates add an "outdir" raster as an output from the
> r.drain and r.cost modules which creates a backlink raster, or a
> raster surface of the movements made to create the cost surface
> (recorded in degrees). I then modified r.drain to read this surface
> when it's given the "-d" flag.
>
> The changes I have made to these modules will be submitted as a patch
> to the trac system relatively soon, but I have a few questions first.
>
> 1) I started the changes to r.walk and r.drain on code downloaded last
> June, labeled as "grass-6.3.0RC6." And added the functionality to
> r.cost at the end of october to a version I checked out using "svn
> checkout https://svn.osgeo.org/grass/grass/branches/develbranch_6". My
> question is, how do I submit these patches in a way that doesn't
> over-write subsequent changes (especially the earlier ones)? Should I
> re-write the r.walk and r.drain updates into a more recent version?
>
> 2) Do I simply attach the .patch files to a new ticket?
>
> Thanks for your help,
>
> -Colin
>
>
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> End of grass-dev Digest, Vol 32, Issue 21
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