NAME

       r.quantile  - Compute quantiles using two passes.

KEYWORDS

       raster, algebra, statistics, percentile, quantile

SYNOPSIS

       r.quantile
       r.quantile --help
       r.quantile   [-r]   input=name   [quantiles=integer]    [percentiles=float[,float,...]]    [bins=integer]
       [file=name]   [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -r
           Generate recode rules based on quantile-defined intervals

       --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

       quantiles=integer
           Number of quantiles
           Default: 4

       percentiles=float[,float,...]
           List of percentiles

       bins=integer
           Number of bins to use
           Default: 1000000

       file=name
           Name for output file (if omitted or "-" output to stdout)

DESCRIPTION

       r.quantile computes quantiles in a manner suitable for use with large amounts of data. It  is  using  two
       passes.

EXAMPLE

       Calculation of elevation quantiles (printed to standard-out):
       g.region raster=elevation -p
       r.quantile input=elevation percentiles=0.1,1,10,25,50,75,90,99,99.9
       The output of r.quantile can be used for quantile classification:
       g.region raster=elevation -p
       r.quantile elevation quantiles=5 -r --quiet | r.recode elevation \
                  out=elev_quant5 rules=-

SEE ALSO

         r.mode,  r.quant, r.recode, r.series, r.stats, r.stats.quantile, r.stats.zonal, r.statistics, r.univar,
       v.rast.stats

AUTHOR

       Glynn Clements

SOURCE CODE

       Available at: r.quantile source code (history)

       Accessed: unknown

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

       © 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual

GRASS 7.8.7                                                                                   r.quantile(1grass)