Thanks for the message, but when I try to run i.cluster with just one raster, the module doesn't work because: " subgroup need two images" . GC
Il giorno mar 18 set 2018 alle ore 21:34 Markus Metz < [email protected]> ha scritto: > > > On Tue, Sep 18, 2018 at 3:38 PM Giuseppe Cillis <[email protected]> > wrote: > > > > Hi, > > I am in the first experiences with GRASS and I have a problem with the > i.maxlik module. > > I have to semi-automatically classify two orthophotos already > geo-referenced and rectified. As a first operation, I create a group and a > subgroup in which I put the two orthophotos. Next, I create a signature > with the i.cluster module (initial number of class = 5; iterations = 30; > percent convergence = 95%; minimum number of pixels = 5). But in the > resulting output there is a problem because the only classified part is the > overlap zone between the two orthophotos ... why? > > you need to either classify each orthophoto separately (which is probably > not what you want) or first patch (the different bands of) the two > orthophotos together with r.patch, then run i.cluster + i.maxlik. When > patching the two orthophotos together, make sure the current region covers > both orthophotos, e.g. > > g.region -p rast=orthophoto1,orthophoto2 > > Markus M > > > I hope I was clear > > GC > > _______________________________________________ > > grass-user mailing list > > [email protected] > > https://lists.osgeo.org/mailman/listinfo/grass-user >
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