On Wed, Nov 19, 2014 at 2:04 PM, Moritz Lennert <[email protected]> wrote: > On 18/11/14 09:47, Markus Metz wrote: >> >> On Sun, Nov 16, 2014 at 3:21 AM, Vaclav Petras <[email protected]> >> wrote: >>> >>> Hi, >>> >>> I executed the examples in i.cluster and i.maxlik manuals and also the >>> following i.segment command: >>> >>> i.segment group=lsat7_2002@w1-imagery output=lsat7_2002_segments >>> threshold=0.5 goodness=lsat7_2002_segments_goodness >>> >>> (using the imagery group created in i.cluster example, otherwise >>> unrelated) >>> >>> I looked at goodness from i.segment and then reject from i.maxlik. I >>> noticed >>> that there is some correlation between these two. Well, this is quite >>> okay >>> since they are using same pixel values. However, then I noticed that low >>> values of goodness (-5000, ...) >> >> >> i.segment's goodness estimate is supposed to be in the range [0,1]. >> Fixed in r62793,4. Can you test again? > > > Could you explain / put into the manual the explanation of the calculation / > meaning of this goodness of fit ?
Done in r62830: The goodness of fit for each pixel is calculated as 1 - distance of the pixel to the object it belongs to. The distance is calculated with the selected similarity method. A value of 1 means identical values, perfect fit, and a value of 0 means maximum possible distance, worst possible fit. Markus M _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
