GRASS GIS manual: r.quantile

NAME

r.quantile - Compute quantiles using two passes.

KEYWORDS

raster, statistics

SYNOPSIS

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

Flags:

-r: Generate recode rules based on quantile-defined intervals.
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=name: 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

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:

g.region rast=elevation.dem -p
r.quantile input=elevation.dem percentiles=0.1,1,10,25,50,75,90,99,99.9

AUTHOR

Glynn Clements

Last changed: $Date: 2007-04-06 21:49:26 +0200 (Fri, 06 Apr 2007) $

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