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.
(GRASS Raster Program)
SYNOPSIS
r.mode
r.mode help
r.mode base=name cover=name output=name
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.
If the user simply types r.mode on the command line, the
user is prompted for the parameter values
through the standard
parser
interface (see parser manual entry).
Alternately, the user can supply all needed parameter values
on the command line.
Parameters:
- base=name
- 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.
- cover=name
- An existing raster map layer containing the values
to be used to compute the mode within each category of the base map.
- output=name
- The name of a new map layer to contain program output
(a reclass of the base map). The mode values will be stored
in the output 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.
SEE ALSO
AUTHOR
Michael Shapiro,
U.S.Army Construction Engineering
Research Laboratory