r.li.pielou(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

💅 r.li.pielou — GRASS GIS User's Manual, bestie edition 🦋

okay so this is r.li.pielou(1) from the GRASS GIS User's Manual and she is serving landscape ecology realness. get comfy, we're doing diversity math together 🫶

✨ NAME ✨

r.li.pielou — Calculates Pielou's diversity index on a raster map 💖

🏷️ KEYWORDS 🏷️

raster, landscape structure analysis, diversity index

🌈 SYNOPSIS 🌈

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

🎀 Flags:

  • --overwrite — Allow output files to overwrite existing files (she's ✨assertive✨ like that)
  • --help — Print usage summary (when you're lost in the sauce, no shame)
  • --verbose — Verbose module output (she talks a LOT, love that for her)
  • --quiet — Quiet module output (main character silence 🤫)
  • --ui — Force launching GUI dialog

🌸 Parameters:

  • input=name [required] — Name of input raster map (your lil map bestie)
  • config=name [required] — Configuration file
  • output=name [required] — Name for output raster map

💜 DESCRIPTION 💜

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

with:

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

the way that it's literally combining all of these into one iconic number?? obsessed. 🔥

📝 NOTES 📝

do NOT use absolute path names for the config and output file/map parameters. fr fr. i'm serious bestie.

If the "moving window" method was selected in g.gui.rlisetup, then the output will be a raster map, otherwise an ASCII file will be generated in the folder

C:\Users\userxy\AppData\Roaming\GRASS8\r.li\output\ (MS-Windows)

or

$HOME/.grass8/r.li/output/ (GNU/Linux).

If the input raster contains NULL value cells, r.li.pielou returns NULL for these cells. it's giving "if you're empty inside, you get empty back" 😭

⭐ 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

👀 SEE ALSO 👀

r.li - package overview, g.gui.rlisetup

📚 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)

👑 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)

🔥 SOURCE CODE 🔥

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

Accessed: Saturday Jan 17 05:40:54 2026

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

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

and that's the whole page bestie 💖 this was GRASS 8.4.2, accessed on that Saturday Jan 17 05:40:54 2026 moment, and she ate, no crumbs. periodt. ✨🎀🦋

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