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NAME
r.mode - Finds the mode of values in a cover map within areas assigned the same category value in a user-specified base map.
KEYWORDS
raster, statistics
SYNOPSIS
r.mode
r.mode help
r.mode base=string cover=string output=string [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- base=string
- Base map to be reclassified
- cover=string
- Coverage map
- output=string
- Output map
DESCRIPTION
r.mode calculates the most frequently occurring value (i. e., mode)
of data contained in a cover raster map layer for areas assigned
the same category value in the user-specified base raster map
layer. These modes are stored in the new output map layer.
The output map is actually a reclass of the base
map.
The base parameter defines an existing raster map layer in the user's
current mapset search path. For each group of cells assigned the same
category value in the base map, the mode of the values assigned
these cells in the cover map will be computed.
The cover parameter defines an existing raster map layer containing
the values to be used to compute the mode within each category of the
base map.
NOTES
The user should use the results of r.mode with care.
Since this utility assigns a value to each
cell which is based on global information (i.e., information at spatial
locations other than just the location of the cell itself), the resultant
map layer is only valid if the geographic region and mask settings are
the same as they were at the time that the result map was created.
Results are affected by the current region settings and mask.
EXAMPLE
Mode of K-factor (erosion) for Spearfish fields:
g.region rast=fields -p
r.mode base=fields cover=soils.Kfactor output=K.by.farm.mode
r.univar K.by.farm.mode
SEE ALSO
g.region,
r.average,
r.category,
r.clump,
r.describe,
r.mapcalc,
r.median,
r.mfilter,
r.neighbors,
r.reclass,
r.stats,
r.statistics,
r.univar
AUTHOR
Michael Shapiro,
U.S.Army Construction Engineering Research Laboratory
Last changed: $Date: 2008-05-16 12:09:06 -0700 (Fri, 16 May 2008) $
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