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 pixels 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 arbitrary (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: Monday Jan 30 19:49:11 2023 in commit: 5fb6b1a969e72db28df78483d3360b15a17f0c68
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual