[GRASS-dev] Re: GRASS-dev] Add a cost distance measure to GRASS GIS lib

[Michael Barton]

This sounds like a potentially interesting and valuable idea. I don't know what the 'cost' might be in terms of building this functionality into other modules.

Michael



On Mar 1, 2012, at 12:00 PM, <grass-dev-request at lists.osgeo.org> wrote:

> Date: Thu, 01 Mar 2012 09:27:16 +0100
> From: Benjamin Ducke <benducke at fastmail.fm>
> Subject: [GRASS-dev] Add a cost distance measure to GRASS GIS lib
> To: "grass-dev" <grass-dev at lists.osgeo.org>
> Message-ID:
> 	<1330590436.12493.140661043300969 at webmail.messagingengine.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi All,
> 
> I have been pondering this for a while and would
> like to know if people on this list think the
> following would be a feasible/useful addition to
> GRASS (7):
> 
> How about, in addition to the MASK raster, we'd
> also allow the user to specify a COST raster?
> This would allow all raster modules that currently
> use an euclidean distance measure (KDE, IDW, ...)
> to use a cost-based measure instead, without adding
> more options to the individual modules.
> 
> In addition to the COST raster, we could modify the
> basic distance function in the GRASS GIS lib to
> automatically return a cost-based result if the
> COST raster is present. This way, there would have
> to be no or only minimal modifications to existing
> modules.
> 
> For anisotropic cost distances, we could allow a
> DIRECTION raster.
> 
> Ben

_____________________
C. Michael Barton
Visiting Scientist, Integrated Science Program
National Center for Atmospheric Research &
University Consortium for Atmospheric Research
303-497-2889 (voice)

Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu