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 (printed to standard-out): g.region rast=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 rast=elevation -p r.quantile elevation quantiles=5 -r --quiet | r.recode elevation \
out=elev_quant5 rules=-

SEE ALSO¶

r.quant

AUTHOR¶

Glynn Clements Last changed: $Date: 2013-04-10 17:52:37 +0200 (Wed, 10 Apr 2013) $ Full index © 2003-2014 GRASS Development Team