Simen, In case you can not find a solution with gdal_calc.py, you could try to use pkfilter from pktools (http://pktools.nongnu.org). Once installed (currently under Linux only), you can produce your median raster as follows:
pkfilter -i infile -o outfile -dz 1 -f median The option -dz 1 indicates a filter in the spectral/time domain (instead of space domain). You can also check the examples on http://pktools.nongnu.org/html/md_doc_examples_pkfilter.html#examples_pkfilter Please don't hesitate to mail if you have any problems installing or running the command. Pieter.
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