Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
NAME
r.bitpattern - Compares bit patterns with a raster map.
KEYWORDS
raster,
algebra
SYNOPSIS
r.bitpattern
r.bitpattern --help
r.bitpattern input=name output=name pattern=integer patval=integer [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- input=name [required]
- Name of input raster map
- output=name [required]
- Name for output raster map
- pattern=integer [required]
- Bit pattern position(s)
- patval=integer [required]
- 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:
- define position: set bit(s) to 1 which shall match,
then convert this position pattern to integer, set pattern=
parameter with that integer value
- 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).
- define position:
xx xx 1x xx
binary: 1000 -> integer: 8 -> pattern=8
- 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
i.modis.qc,
r.mapcalc
Radim Blazek, Markus Neteler
SOURCE CODE
Available at:
r.bitpattern source code
(history)
Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55
Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
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GRASS Development Team,
GRASS GIS 7.8.8dev Reference Manual