Oops, forgot to copy the list… From: Stefan Blumentrath Sent: mandag 6. november 2017 13.15 To: 'Žofie Cimburová' <zoficimbur...@gmail.com> Subject: RE: [GRASS-user] i.spec.unmix - scale results to 0-100%
My guess would be that you have to normalize the data for every layer in each pixel, like r.mapcalc expression=”water_n= float (water-min(water, builtup, forest))/ float (max(water, builtup, forest)-min(water, builtup, forest))\ builtup _n= float (builtup-min(water, builtup, forest))/ float (max(water, builtup, forest)-min(water, builtup, forest))\ water_n=float(forest-min(water, builtup, forest))/ float (max(water, builtup, forest)-min(water, builtup, forest))” Or something like that… Cheers Stefan From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of Žofie Cimburová Sent: mandag 6. november 2017 11.18 To: Markus Neteler <nete...@osgeo.org<mailto:nete...@osgeo.org>> Cc: GRASS user list <grass-user@lists.osgeo.org<mailto:grass-user@lists.osgeo.org>> Subject: Re: [GRASS-user] i.spec.unmix - scale results to 0-100% Hi, On Fri, Nov 3, 2017 at 5:06 PM, Markus Neteler <nete...@osgeo.org<mailto:nete...@osgeo.org>> wrote: On Fri, Nov 3, 2017 at 11:10 AM, Žofie Cimburová <zoficimbur...@gmail.com<mailto:zoficimbur...@gmail.com>> wrote: > Hi, > I am using i.spec.unmix for spectral unmixing of Sentinel-2 imagery. I > define 6 endmembers and the results look pretty fine, but when I add the > output maps up, they don't sum up to 100%, but rather anything from 23 till > 67... > I tried to linearly scale the output maps to 0-100% and then add them up, > but this does not sum up to 100% either. > In the manual there is a small comment "# todo: reclass to 0..100%". There was a change for this but probably not catching the problem: On Tue, Jul 4, 2017 at 10:53 PM, <svn_gr...@osgeo.org<mailto:svn_gr...@osgeo.org>> wrote: > Author: ychemin > Date: 2017-07-04 13:53:58 -0700 (Tue, 04 Jul 2017) > New Revision: 71240 > > Modified: > grass-addons/grass7/imagery/i.spec.unmix/main.c > Log: > trying to rescale from 0-256 to 0-100, with according colour scheme > How do I perform the reclassification manually? Probably https://grass.osgeo.org/grass72/manuals/r.rescale.html but it would be better to get the Addon completed. This does not solve my problem - the output maps are not scaled to 0-255. The ranges of my output maps are e.g. Map 1-water: 0-34, Map 2-builtup: 0-65, Map 3-forest:0-13, .... I tried to r.rescale each map to 0-100, but they then don't sum up to 100 either. Is there probably different scaling for each output map? Or how else can I interpret the results if not in form of ratios? Thanks, Zofie
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