r.describe - Prints terse list of category values found in a raster map layer.

       Michael Shapiro, U.S. Army Construction Engineering Research Laboratory

r.describe prints a terse listing of category values found in a user-specified raster map layer.

       r.describe ignores the current geographic region and mask, and reads the full extent of the input  raster
       map.   This  functionality  is  useful if the user intends to reclassify or rescale the data, since these
       functions (r.reclass and r.rescale) also ignore the current geographicregion and mask.

       The nv parameter sets the string to be used to represent NULL values in the module output; the default is
       ’*’.

       The nsteps parameter sets the number of quantisation steps to divide into the input raster map.

       The following examples are from the Spearfish60 sample dataset:

   Printthefulllistofrastermapcategories
       r.describe landcover.30m
       * 11 21-23 31 32 41-43 51 71 81-83 85 91 92

   Printtherasterrangeonly
       r.describe -r landcover.30m
       11 thru 92
       *

   Printrastermapcategoryrange,suppressingnulls
       r.describe -n landcover.30m
       11 21-23 31 32 41-43 51 71 81-83 85 91 92

   Printrastermapcategories,onecategoryperline
       r.describe -1 geology
       *
       1
       2
       3
       4
       5
       6
       7
       8
       9

       raster, metadata

r.describe  - Prints terse list of category values found in a raster map layer.

FLAGS
       If the user selects the -r flag, a range of category values  found  in  the  raster  map  layer  will  be
       printed.  The range is divided into three groups: negative, positive, and zero. If negative values occur,
       the minimum and maximum negative values will be printed.  If  positive  values  occur,  the  minimum  and
       maximum  positive  values  will be printed. If zero occurs, this will be indicated. The range report will
       generally run faster than the full list (the default output).

       The -d flag can be used to force r.describe to respect the current region extents  when  repoting  raster
       map categories. The default behavior is to read the full extent of the input raster map.

       If the -1 flag is specified, the output appears with one category value/range per line.

       The -n flag suppresses the reporting of NULL values.

g.region,r.mask,r.reclass,r.report,r.rescale,r.stats,r.univar

       Available at: r.describe source code (history)

       Accessed: Friday Apr 04 01:19:05 2025

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       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                                   r.describe(1grass)

r.describer.describe--helpr.describe  [-1rndi]  map=name  [null_value=string]   [nsteps=integer]   [--help]  [--verbose]  [--quiet]
       [--ui]

   Flags:-1
           Print the output one value per line

       -r
           Only print the range of the data

       -n
           Suppress reporting of any NULLs

       -d
           Use the current region

       -i
           Read floating-point map as integer

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:map=name[required]
           Name of raster map

       null_value=string
           String representing NULL value
           Default: *nsteps=integer
           Number of quantization steps
           Default: 255