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man page of r.bitpattern

r.bitpattern: Compares bit patterns with a raster map.

r.bitpattern - Compares bit patterns with a raster map.


r.bitpattern r.bitpattern help r.bitpattern [-q] input=name output=name pattern=integer patval=integer [--overwrite] [--verbose] [--quiet] Flags: -q Quiet --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: input=name Name of input raster map output=name Name for output raster map pattern=integer Bit pattern position(s) patval=integer Bit pattern value


r.bitpattern performs bit pattern comparisons. The module can be used to pixelwise verify a satellite image for low quality pixels if a Quality Control Bit Index map is provided (e.g. as for MODIS sensor maps). The functionality is two-fold: 1 define position: set bit(s) to 1 which shall match, then convert this position pattern to integer, set pattern= parameter with that integer value 2 define pattern *value* which should be in that position: first bit pattern of value, convert to integer, set patval= parameter If several bitpatterns have to be tested, the resulting maps can be used to exclude low quality pixel in the input satellite image using r.mapcalc (OR and NOT operators).


1 define position: xx xx 1x xx binary: 1000 -> integer: 8 -> pattern=8 2 define value: Ex.: we want to check for 0 in that position xx xx 0x xx binary: 0000 -> integer: 0 -> patval=0 if value can be arbitray (0/1), then assume 0 value


Radim Blazek, Markus Neteler Last changed: $Date: 2008-05-16 21:09:06 +0200 (Fri, 16 May 2008) $ Full index (C) 2003-2010 GRASS Development Team R.BITPATTERN(1)

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