Hi Markus, is there a chance that this patch (or r.grow shrinking patches if radius is negative) will land in relbr70?
cheers, robert On Thursday 05 February 2015 22:13:32 Markus Metz wrote: > On Thu, Feb 5, 2015 at 2:53 PM, Paulo van Breugel > > <[email protected]> wrote: > > Check out the r.growth.shrink addon. > > See also ticket #2368 [0] which includes a patch for r.grow.distance > to shrink (distance from nearest NULL cell to be precise). > > Markus M > > https://trac.osgeo.org/grass/ticket/2368 > > > On Thu, Feb 5, 2015 at 1:59 PM, Robert Nuske <[email protected]> wrote: > >> Hi there, > >> > >> looking at some noisy raster map, I would like to clean up the patches > >> (map > >> consists only of one class and NULL) using basic mathematical morphology > >> (dilation & erosion) in GRASS 7.0. > >> > >> > >> The dilation can easily be achieved with r.grow. > >> But the erosion seems not to be as straight forward. > >> > >> Since the example about shrinking was removed from the help page of > >> r.grow > >> in > >> GRASS 7.0 (http://grass.osgeo.org/grass70/manuals/r.grow.html), I hoped > >> for an > >> easier way to carry out the erosion. Looking in vain for a raster command > >> named shrink or erode, I tried a negative distance in r.buffer (-> error) > >> and > >> negative radius in r.grow (treated as absolute value). > >> > >> The following produce identical output with grown patches. > >> > >> r.grow in=mod_10_33 out=mod_10_33_1 radius=1.1 > >> r.grow in=mod_10_33 out=mod_10_33_2 radius=-1.1 > >> > >> Any suggestions for a quick erosion? > >> > >> > >> thanks > >> > >> Robert > >> > >> _______________________________________________ > >> grass-user mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/grass-user > > > > _______________________________________________ > > grass-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
