Hi all, I want to do an atmospheric correction of my Landsat ETM+ images using the i.atcorr module in Grass 6.3 on Ubuntu, but I never get an output. When I use a DEM in *ialt*, the continuous version or the categorized, of the region, I just get "wavelength less than 0.25 micron let's take s(1)=s(0.25)". I don't insert an altitude value in my *icdn* file however, since I've read that that value would overwrite the DEM. When I do put in an altitude value, I get a list with the parameters for the 6S-algorithm, and then 'percent complete', so that seems to be ok, but the algorithm stops running, so I don't get a corrected image. Does anyone have experience with this module, and help me with some tips, preferably so I can use my DEM instead of one altitude value for the whole image?
This is my *icdn *file when I use the DEM: 8 2 12 08.500 +35.2203028 -2.8893705 1 0 -1 -1000 64 and this when I use one altitude for the whole region: 8 2 12 08.500 +35.2203028 -2.8893705 1 0 -1 1000 -1000 64 Thanks in advance! Kind regards, Annekatrien
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