r.quant(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

💖 r.quant — the manual page, bestie edition 💖

okay so this is r.quant, straight out of the GRASS GIS User's Manual (manual section 1, iykyk). She makes quantization files for floating-point maps and honestly? she eats every time. ✨

🌸 NAME 🌸

r.quant — produces the quantization file for a floating-point map. no cap, that's the whole job description. 💅

🎀 KEYWORDS 🎀

raster, statistics, quantization — the lil trio of tags that describe her whole vibe.

✨ 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. just chop it. ✂️
  • -r — round floating point data. polite little numbers. 🧚
  • --help — print usage summary
  • --verbose — verbose module output (she'll tell you everything)
  • --quiet — quiet module output (she'll tell you nothing, respectfully 🤫)
  • --ui — force launching GUI dialog

🦋 Parameters 🦋

  • input=string[,string,...] [required] — raster map(s) to be quantized. mandatory bestie, you can't skip it.
  • 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 💜

so r.quant produces the quantization file for a floating-point map. that's it, that's her whole thing, and she's iconic for it. 👑

the map parameter defines the map for which the rules are to be created. and like, if you specify more than one map? 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. girl math, but make it geographic. 🌈

🌟 Quant rules 🌟

the quant rules have to be entered interactively. yes bestie, you literally type them in. live your truth.

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. so dramatic. so valid. 💫

🫶 NOTE 🫶

it is an error to specify both basemap and fprange. pick a lane, bestie. 😭 she will not do both.

🌈 SEE ALSO 🌈

r.support, r.null — go read those too, they're in the group chat.

👑 AUTHORS 👑

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

(three icons, one lab, no notes 💅)

🍓 SOURCE CODE 🍓

available at: r.quant source code (history)

Accessed: Saturday Jan 17 05:40:55 2026

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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.2 Reference Manual

and that's the whole page, bestie 🎀 this was r.quant(1) from the GRASS GIS User's Manual, living her best life in GRASS 8.4.2, copyright GRASS Development Team 2003-2025, last accessed Saturday Jan 17 05:40:55 2026. periodt. ✨💖🦋
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