Thank you Moritz, this worked beautifully!
> Date: Mon, 7 May 2012 18:00:01 +0200 > From: [email protected] > To: [email protected] > CC: [email protected]; [email protected] > Subject: Re: [GRASS-user] Euclidean distance (grow.distance) on raster to > certain extent? > > On 07/05/12 16:36, Daniel Lee wrote: > > Hi Tanya, > > > > I would use r.distance rather than r.grow.distance and then reclassify > > the results to include only areas with <=1108 m distance - that should > > be a lot easier. > > I don't think r.distance gives what you want, however r.grow.distance > should be exactly your tool: > > As a starting point you need a raster map with all pixels in the orchard > non-null and all other pixels null Let's call that raster map > 'orchard'. Then you can do the following: > > r.grow.distance input=orchard distance=distance_map > > Then, if you only want to see the distance from the orchard to 1108m, > then you can use r.mapcalc: > > r.mapcalc "final_distance_map=if(distance_map>1108, null(), distance_map)" > > All this keeping in mind that I don't understand what you mean by "I > recognize this tool does not allow a distance to be included". > > If this means that you also want to measure a distance _within_ the > orchard, then instead of using a raster map of the orchard, use as input > to r.grow.distance a raster map with only the center pixel of the > orchard non-null. > > Moritz > > > > > 2012/5/7 Tanya Dyck <[email protected] <mailto:[email protected]>> > > > > Hello, > > > > I am trying to run the grow.distance command to create a raster that > > displays the euclidean distance from an 'orchard' outward to 1108m. > > I am not trying to measure the distance between 2 non-null > > features, but simply wish to have the euclidean distance extend out > > from the orchard to 1108m. I recognize this tool does not allow a > > distance to be included so I created a buffer around my orchard > > (1108m) and intended to run grow.distance on that, however it > > outputs the distance as if it includes the full raster extent (so I > > have an output raster of 1108m that is all yellow as opposed to a > > range of values displaying varying distances) and not limited to my > > buffer. I want it to assume the buffer extent is the raster extent, > > so to speak. Is there another way to do this? > > Any ideas would be much appreciated. > > > > Best, > > > > Tanya > > > > _______________________________________________ > > grass-user mailing list > > [email protected] <mailto:[email protected]> > > http://lists.osgeo.org/mailman/listinfo/grass-user > > > > > > > > > > _______________________________________________ > > grass-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user > >
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