r.li.padcv(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

💖 r.li.padcv 💖

okay bestie so this is r.li.padcv from the GRASS GIS User's Manual — she calculates the coefficient of variation of patch area on a raster map. it's giving landscape structure analysis energy, she's a real patch index queen 👑

KEYWORDS: raster, landscape structure analysis, patch index 🌸

✨ SYNOPSIS ✨

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

🎀 FLAGS 🎀

  • --overwrite — bestie she will let output files overwrite existing files. like she's not scared of commitment 💅
  • --help — prints the usage summary, for when you're lost (no judgment)
  • --verbose — verbose module output, she'll tell you EVERYTHING
  • --quiet — quiet module output, she's giving mysterious and silent 🦋
  • --ui — forces launching the GUI dialog, for the girlies who love a visual ✨

🌈 PARAMETERS 🌈

  • input=name [required] — name of input raster map, so like, the map you're analyzing
  • config=name [required] — configuration file, aka your setup vibes
  • output=name [required] — name for output raster map, where the girl drops her results 💖

💅 DESCRIPTION 💅

okay so r.li.padcv calculates the coefficient of variation of patch area sizes in hectares, like this:

and then, with:

  • SD — standard deviation of patch area size
  • MPS — mean patch area size
  • ai — area of patch i
  • Npatch — number of patches

periodt. that's the math, she's iconic for it 👑

🔥 NOTES 🔥

Do NOT use absolute path names for the config and output file/map parameters. fr fr, don't do it.

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

The result is NULL if the sample area contains only NULL values. no cap, that's just how she is 😭

🌸 EXAMPLES 🌸

To calculate patch area distribution coefficient of variation 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.padcv 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.padcv input=forests conf=movwindow7 out=forests_padcv_mov7
r.univar forests_padcv_mov7

Forest map (North Carolina sample dataset) example:

g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.padcv input=forests conf=movwindow7 out=forests_padcv_mov7
# verify
r.univar forests_padcv_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_padcv_mov7
d.vect forests type=boundary

🦋 SEE ALSO 🦋

  • r.li — package overview, the mothership 💖
  • 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 👑

  • Michael Shapiro - CERL (patch identification)
  • Markus Metz (statistics)

⭐ SOURCE CODE ⭐

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

Accessed: Saturday Jan 17 05:40:53 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 lil manual is brought to you by GRASS 8.4.2, and she was accessed on that Saturday Jan 17 05:40:53 2026 moment. slay, go calculate those patch areas, i'm obsessed with you 💜🌈✨

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