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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