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       r.recode  - Recodes categorical raster maps.


       raster, recode categories, reclassification


       r.recode --help
       r.recode [-ad] input=name output=name rules=name  [title=string]   [--overwrite]  [--help]
       [--verbose]  [--quiet]  [--ui]

           Align the current region to the input raster map

           Force output to ’double’ raster map type (DCELL)

           Allow output files to overwrite existing files

           Print usage summary

           Verbose module output

           Quiet module output

           Force launching GUI dialog

       input=name [required]
           Name of raster map to be recoded

       output=name [required]
           Name for output raster map

       rules=name [required]
           File containing recode rules
           ’-’ for standard input

           Title for output raster map


       r.recode creates an output raster map by recoding input raster map based on recode  rules.
       A title for the output raster map may be (optionally) specified by the user.

       The recode rules can be read from standard input (i.e., from the keyboard, redirected from
       a file, or piped through another program) by entering rules=-.

       Rules are defined in one of these formats:
       old_low:old_high:new_val  (i.e. new_high == new_low)
       *:old_val:new_val         (interval [inf, old_val])
       old_val:*:new_val         (interval [old_val, inf])

       r.recode is loosely based on r.reclass and uses the GRASS Reclass Library to  convert  the
       rasters.  It has routines for converting to every possible combination of raster (eg. CELL
       to DCELL, DCELL to FCELL, etc). Standard floating point raster precision is float (FCELL),
       with -d double precision (DCELL) will be written.

       There are four basic routines that it accepts:

       1      old-low  to  old-high is reclassed to new-low to new high , where the user provides
              all four values. The program figures on the fly  what  type  of  raster  should  be

       2      old-low  to old-high is reclassed to a single new value. Anything outside the range
              is null.

       3      * to old-high will reclass everything less than old-high to a single new value.

       4      old-low to * will reclass everything greater than old-low to a single new value.

       These four sets of arguments can be given on the command line, or piped  via  stdin  or  a
       file. More than one set of arguments is accepted.


   Map type conversion
       To simply convert a raster between formats (eg. int to float) the user would use the first
       argument. For example
       would convert an input raster map with range between 10 and 1500 to a float raster  raster
       with range between 0.1 and 15.0.

   Value replacement
       r.recode  can  be  used  to  replace  existing cell values by others. The formatting is as
       described above. In following example the values 1, 2 and 3 are replaced by 1.1, 7.5 resp.
       r.recode input=oldmap output=newmap rules=- << EOF



       Last changed: $Date: 2018-10-18 21:05:15 +0200 (Thu, 18 Oct 2018) $


       Available at: r.recode source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual