r.quant(1)

NAME
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 minimum 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 and 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 to specify both basemap and fprange.

SEE ALSO
r.support, r.null

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

SOURCE CODE

Available at: r.quant source code (history)

Accessed: Monday May 11 17:54:17 2026

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