On Fri, Mar 6, 2015 at 8:55 AM, Moritz Lennert <[email protected]> wrote: > On 06/03/15 08:44, Nikos Alexandris wrote: >> >> .. >> >>>> Markus M: >> >> >>>> So, I guess I'll forget the idea to fully automatise the process of >>>> Landsat >>>> border trimming? Can't we just have all of the Path-Row tiles ready >>>> in a >>>> compressed GRASS format? Some sort of packed ASCII file which can be >>>> easily >>>> imported? No other ideas? >>> >>> >>> I think you can trim the borders using the Landsat raster data >>> themselves: according to the metadata, valid numbers are > 0. If the >>> sum of all bands is zero, the pixel is outside. > > > If valid numbers > 0, why does the sum of all bands have to be zero ? > Normally, all bands are aligned, so in my understanding any 0 can be set to > NULL, or ?
I guess yes, but when developing the script it might be a good idea to test if the bands are really aligned and if one band is zero, all others should also be zero. Just to be safe. Markus M > > Moritz _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
