r.quant.1grass man page

r.quant — Produces the quantization file for a floating-point map.

Keywords

raster, statistics, quantization

Synopsis

r.quant
r.quant --help
r.quant [-tr] input=string[,string,...]  [rules=name]   [basemap=string]   [fprange=dmin,dmax]   [range=min,max]   [--help]  [--verbose]  [--quiet]  [--ui]

Flags

-t

Truncate floating point data

-r

Round floating point data

--help

Print usage summary

--verbose

Verbose module output

--quiet

Quiet module output

--ui

Force launching GUI dialog

Parameters

input=string[,string,...] [required]

Raster map(s) to be quantized

rules=name

Path to rules file ("-" to read from stdin)

basemap=string

Base map to take quant rules from

fprange=dmin,dmax

Floating point range: dmin,dmax

range=min,max

Integer range: min,max

Description

r.quant produces the quantization file for a floating-point map.

The map parameter defines the map for which the rules are to be created. If more than one map is specified, then this implies that the floating-point range is the miniumum and maximum of all the maps together, unless either basemap=map or fprange=min,max is specified.

Quant rules

The quant rules have to be entered interactively.

If rules is specified, the input has the form:

value1:value2:cat1:[cat2]

where value1 and value2 are floating point values and cat1 cand cat2 are integers. If cat2 is missing, it is taken to be equal to cat1. All values can be "*" which means infinity.

Note

It is an error for both basemap and fprange to be specified.

See Also

r.support, r.null

Author

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

Last changed: $Date: 2011-11-08 13:24:20 -0800 (Tue, 08 Nov 2011) $

Source Code

Available at: r.quant source code (history)

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