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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
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 08:52:37 -0700 (Wed, 10 Apr 2013) $
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