Hello,
I'm totally new user of GRASS and of course I have some problems. I want to do the pre-processing of Landsat (5TM) images (for further band composite, classification and NDVI) and I was using the tips from http://grasswiki.osgeo.org/wiki/LANDSAT#Pre-Processing I did the i.landsat.toar I wanted to do the i.atcorr as well but I have no idea how to do this, the manual was not helpful for me, so I gave up. I did not do i.topo.corr because the land I'm working on is flat.
And I really want to do "radiometrically normalise → one approach via i.histo.match (in grass 7), also known as relative radiometric normalisation -- one approach is the histogram matching technique of two or more raster maps". I have fragments of original landsat images imported to GRASS and i.histo.match works with them without any problems. But there is a problem when I want to do this on images which I got after i.landsat.toar. The output images are monochromatic-one colour. I've used command i.histo.match input=_toar2@konfa,86_toar2@konfa (the input files are those which I got after i.landsat.toar) and then r.colors map=86_toar2.match@konfa color=grey. I thought that those steps from grasswiki should be done "step by step", so first i.landsat.toar, and then on the output files i.histo.match.
Does anyone know how to do this in a proper/correct way?
Best wishes
Joan
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