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NAME

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

KEYWORDS

raster, quantization

SYNOPSIS

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

Flags:

-t
Truncate floating point data
-r
Round floating point data
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

basemap=string
Base map to take quant rules from
Default: NONE
input=string[,string,...]
Raster map(s) to be quantized
fprange=dmin,dmax
Floating point range: dmin,dmax
Default:
range=min,max
Integer range: min,max
Default: 1,255

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: 2010-02-27 17:56:22 -0800 (Sat, 27 Feb 2010) $


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