trusty (1) r.mode.1grass.gz

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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       © 2003-2013 GRASS Development Team