---
name: "r.quant"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/r.quant"
---

# r.quant(1grass)

Produces the quantization file for a floating-point map.

## 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 Feb 24 17:50:46 2025

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