[GRASS-user] Distance layer
dylan.beaudette at gmail.com
Fri Oct 27 13:07:47 EDT 2006
On Friday 27 October 2006 09:28, Moritz Lennert wrote:
> Nomad Rain wrote:
> > Hello GRASS group!
> > Currently I try to make an environmental application - a script
> > implementing one of the atmospheric polution models. The algorithm
> > demands to include the function which returns the value depending on
> > distance from the polution source.
> > Thus, I want to calculate the layer of distances (first map) from the
> > only pollution source (point on second map).
> > I cannot find the command which can automaticaly return the value of
> > distance between two pixels on two maps.
> > Does anybody know how to do it (find the distance betw. 2 pixels)?
> > I use grass-6.2.0RC2
> r.distance ?
> There was some discussion about a potential problem with r.distance
> Markus Neteler wrote:
> > r.distance happily calculates the distance even if
> > one object is within the other
There was: but only in the case of pixel_1 being contained by raster_zone_2 .
There was a proposed patch by jachym, but not sure about its status.
A raster/vector approach with r.cost might give you more flexibility.
In fact, this might have been the module that came to mind when i first
replied... its early here ;)
Soils and Biogeochemistry Graduate Group
University of California at Davis
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