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r.bitpattern

man page of r.bitpattern

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

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

SYNOPSIS

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

DESCRIPTION

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).

EXAMPLE

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

SEE ALSO

r.mapcalc
AUTHORS
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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