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

   The recode rules are read from standard input (i.e., from the keyboard,
   redirected from a file, or piped through another program).

   The program will be run non-interactively if the user specifies the
   name of the raster map layer to be recoded, the name of an output layer
   to hold recoded map, and (optionally) the name of a title for the
   output map. Rules are defined in one of these formats:
    old_low:old_high:new_low:new_high
    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. int to double, double to float,
   etc). Standard floating point raster precision is float, with -d double
   precision 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 created.
    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.

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   Map type conversion
   To simply convert a raster between formats (eg. int to float) the user
   would use the first argument. For example
   10:1500:0.1:15.0
   would convert an old raster with range between 10 and 1500 to a float
   raster with range bewteen 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. 0.4:
    r.recode in=oldmap out=newmap << EOF
    1:1:1.1:1.1
    2:2:7.5:7.5
    3:3:0.4:0.4
    EOF

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   Last changed: $Date: 2003-05-06 10:35:18 -0500 (ÐÑ, 06 май 2003) $

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