r.li.pielou(1grass)

💖 NAME 💖

okay so bestie, meet r.li.pielou(1grass) — she's the GRASS User's Manual girlie whose whole job is calculating Pielou's diversity index on a raster map. periodt. 🌸

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🔑 KEYWORDS 🔑

raster, landscape structure analysis, diversity index

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✨ SYNOPSIS ✨

r.li.pielou
r.li.pielou --help
r.li.pielou input=name config=name output=name  [--overwrite]  [--help]
[--verbose]  [--quiet]  [--ui]

🎀 Flags:

• --overwrite — lets your output files just steamroll over existing files, no questions asked 💅
• --help — prints the usage summary so you're not lost, bestie
• --verbose — verbose module output, aka she tells you everything 👑
• --quiet — quiet module output, aka she says nothing, silent queen 🤫
• --ui — forces the GUI dialog to launch

🦋 Parameters:

• input=name [required] — the name of your input raster map
• config=name [required] — the configuration file
• output=name [required] — the name for your output raster map

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💜 DESCRIPTION 💜

r.li.pielou calculates the "Pielou's diversity index" as:

with:

• J: Pielou eveness index
• H': Shannon index
• S: number of classes

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🌸 NOTES 🌸

ngl bestie, listen up: do NOT use absolute path names for the config and output file/map parameters. fr fr.

If the "moving window" method was selected in g.gui.rlisetup, then the output will be a raster map — otherwise an ASCII file gets generated in the folder C:\Users\userxy\AppData\Roaming\GRASS8\r.li\output\ (MS-Windows) or $HOME/.grass8/r.li/output/ (GNU/Linux).

And if the input raster contains NULL value cells, r.li.pielou returns NULL for these cells. she keeps it consistent, iconic behavior ✨

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🌈 EXAMPLES 🌈

To calculate Pielou's diversity index on map my_map, using my_conf configuration file (previously defined with g.gui.rlisetup) and saving results in my_out, run:

r.li.pielou input=my_map conf=my_conf output=my_out

Forest map (Spearfish sample dataset) example:

g.region raster=landcover.30m -p
r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())"
r.li.pielou input=forests conf=movwindow7 out=forests_pielou_mov7
r.univar forests_pielou_mov7

Forest map (North Carolina sample dataset) example:

g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.pielou input=forests conf=movwindow7 out=forests_pielou_mov7
# verify
r.univar forests_pielou_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_pielou_mov7
d.vect forests type=boundary

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👀 SEE ALSO 👀

• r.li (package overview) 💖
• g.gui.rlisetup 🎀

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📚 REFERENCES 📚

McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analysis program for quantifying landscape structure. USDA For. Serv. Gen. Tech. Rep. PNW-351. (PDF)

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👑 AUTHORS 👑

Luca Delucchi and Duccio Rocchini, Fondazione E. Mach (Italy), based on the r.li.shannon code developed by Serena Pallecchi, student of Computer Science University of Pisa (Italy). absolute legends, no cap 🫶

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💻 SOURCE CODE 💻

Available at: r.li.pielou source code (history)

Latest change: Friday Apr 17 01:04:26 2026 in commit: 32a143358df26b2e518b03c7e0d79541e8d1e5b1

Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

© 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual

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okay bestie that's the whole page, you're literally a Pielou's-diversity-index main character now 🦋💅 and yeah — she ships with GRASS 8.5.0, and the page itself is r.li.pielou(1grass), so go be iconic with it 🎀✨