Re: [GRASS-user] Question about MODIS band 5 destriping?
Glynn Clements wrote: The main issue is that you can't store both the real and imaginary components (or, alternatively, magnitude and phase) in a single map. Hi It appears to me that this could be done if the raster maps supported layers, AKA surfaces in my work group. Regards Craig ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Question about MODIS band 5 destriping?
On Wed, Apr 9, 2008 at 1:52 PM, Nikos Alexandris [EMAIL PROTECTED] wrote: Dear MODIS-experts, I attempted to de-stripe a MODIS band 5 (periodic striping) with FFT and Which data do you use here (just curious)? The raw bands? manual masking in the frequency domain (as explained in Introductory Digital Image Processing, Jensen the 2nd GRASS-book, Neteler Mitasova). I am not really satisfied with my results. Is there another de-striping method through GRASS? (I did not try with donut filters in the frequency domain yet anything). I think that the strange i.fft file format is an obstacle here. AFAIK it is not saved as normal raster file which limits the possibilities to elaborate. Maybe I am wrong, don't quite remember well.. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Question about MODIS band 5 destriping?
Markus Neteler wrote: I think that the strange i.fft file format is an obstacle here. AFAIK it is not saved as normal raster file which limits the possibilities to elaborate. Maybe I am wrong, don't quite remember well.. No, you're quite correct. i.ifft ignores the actual input map, reading the data from the fftreal and fftimag files created by i.ifft. So you can't modify the i.fft output with e.g. r.mapcalc than use i.ifft on the result. The only modification which can be performed on the FFT data is masking; i.ifft reads the mask separately and applies it to the data. -- Glynn Clements [EMAIL PROTECTED] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
