NAME

       r.reclass.area  - Reclasses a raster map greater or less than user specified area size (in
       hectares).

KEYWORDS

       raster, statistics, aggregation

SYNOPSIS

       r.reclass.area
       r.reclass.area --help
       r.reclass.area  [-cd]  input=name  output=name  value=float  mode=string   [method=string]
       [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -c
           Input map is clumped

       -d
           Clumps including diagonal neighbors

       --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

       value=float [required]
           Value option that sets the area size limit (in hectares)

       mode=string [required]
           Lesser or greater than specified value
           Options: lesser, greater

       method=string
           Method used for reclassification
           Options: reclass, rmarea
           Default: reclass

DESCRIPTION

       r.reclass.area  reclasses a raster map greater or less than a user specified area size (in
       hectares).

       If the -c flag is used, r.reclass.area will skip the creation  of  a  clumped  raster  and
       assume that the input raster is already clumped.

EXAMPLES

       In  this  example,  the  ZIP  code  map  in  the North Carolina sample dataset location is
       filtered for large areas (removing smaller areas from the map):
       g.region raster=zipcodes -p
       r.report zipcodes unit=h
       # extract only areas greater than 2000 ha, NULL otherwise:
       r.reclass.area input=zipcodes output=zipcodes_larger2000ha \
                      mode=greater value=2000
       r.report zipcodes_larger2000ha unit=h
       In this example, the ZIP code map  in  the  North  Carolina  sample  dataset  location  is
       filtered for smaller areas which are substituted with the value of the respective adjacent
       area with largest shared boundary:
       # reclass by substitutional removing of areas minor of 1000 ha
       r.reclass.area input=zipcodes output=zipcodes_minor1000ha \
                      mode=lesser value=1000 method=rmarea

SEE ALSO

        r.reclass, r.clump, r.stats

AUTHORS

       NRCS,
       Markus Neteler

       Last changed: $Date: 2015-11-20 07:00:52 +0100 (Fri, 20 Nov 2015) $

SOURCE CODE

       Available at: r.reclass.area source code (history)

       Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual