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