NAME

r.quant - This routine produces the quantization file for a floating-point map.
(GRASS 5 Raster Program)

SYNOPSIS

r.quant

r.quant [-tr] input=name[,name...] [basemap=map] [fprange=dmin,dmax] [range=min,max]

DESCRIPTION

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

map=name The map for which the rules be 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.
basemap=map The quant rules of this map set the quantization.
fprange=min,max This sets the floating-point range for the quantization.
-t flag Truncate floating point data
-r flag Round floating point data
range=min,max This sets the integer range for the quantization. Otherwise a default of 1-255 is used.

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 and r.null

AUTHOR

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