i.biomass(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

💚 i.biomass — bestie edition 💚

okay so this is i.biomass(1), straight out of the GRASS GIS User's Manual, and she's here to compute biomass growth — which is literally the precursor of crop yield calculation. glow-up math for plants 🌱✨

✨ NAME ✨

i.biomass — computes biomass growth, precursor of crop yield calculation.

🏷️ KEYWORDS 🏷️

imagery, biomass, FPAR, yield

📜 SYNOPSIS 📜

i.biomass
i.biomass --help
i.biomass fpar=name lightuse_efficiency=name latitude=name
dayofyear=name transmissivity_singleway=name water_availability=name
output=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

🚩 Flags:

  • --overwrite — lets output files overwrite stuff that already exists. yes bestie, she will absolutely replace your old files, be aware 💀
  • --help — prints the usage summary, aka the "help me pls" button
  • --verbose — verbose module output, she gets chatty 🗣️
  • --quiet — quiet module output, she shuts up
  • --ui — forces the GUI dialog to launch. main character GUI energy 👑

🎀 Parameters:

  • fpar=name [required] — name of the fPAR raster map
  • lightuse_efficiency=name [required] — name of the light use efficiency raster map (and for the record, UZB:cotton=1.9)
  • latitude=name [required] — name of the degree latitude raster map, in [dd.ddd]
  • dayofyear=name [required] — name of the Day of Year raster map, [1-366]
  • transmissivity_singleway=name [required] — name of the single-way transmissivity raster map, [0.0-1.0]
  • water_availability=name [required] — value of the water availability raster map, [0.0-1.0]
  • output=name [required] — name for the output daily biomass growth raster map, in [kg/ha/d]

🌸 DESCRIPTION 🌸

i.biomass calculates the biomass growth for a day after [1][2]. it's giving "one day, one biomass number, no cap". here's what she needs as input:

  • fPAR, the modified Photosynthetic Active Radiation for crops. 🌞
  • Light Use Efficiency [0.0-1.0] — and in Uzbekistan cotton is at 1.9 most of the time, iykyk.
  • Latitude [0.0-90.0], which you get from r.latlong.
  • DOY [1-366].
  • Transmissivity of the atmosphere single-way [0.0-1.0], mostly around 0.7+ in clear sky. ☁️❌
  • Water availability [0.0-1.0], and you can possibly use direct output from i.eb.evapfr. 💧

📝 NOTES 📝

i.biomass can use the output of i.eb.evapfr directly as water availability input. it's giving plug-and-play, we love a compatible bestie 🫶

🛠️ TODO 🛠️

Remove Latitude, DOY and Tsw from input and replace with a raster input compatible with r.sun output.

that's the to-do list. she's manifesting it. ✨

📚 REFERENCES 📚

[1] Bastiaanssen, W.G.M., Ali, S., 2002. A new crop yield forecasting model based on satellite measurements applied across the Indus Basin, Pakistan. Agriculture, Ecosystems and Environment, 94(3):321-340. (PDF)

[2] Chemin, Y., Platonov, A., Abdullaev, I., Ul-Hassan, M. 2005. Supplementing farm level water productivity assessment by remote sensing in transition economies. Water International. 30(4):513-521.

👀 SEE ALSO 👀

i.eb.evapfr, r.latlong, r.sun

👑 AUTHOR 👑

Yann Chemin, Bec de Mortagne, France

💻 SOURCE CODE 💻

Available at: i.biomass source code (history)

Accessed: Saturday Jan 17 05:41:38 2026

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

and that's the whole page bestie, from GRASS 8.4.2 herself, signed sealed and delivered at the bottom of i.biomass(1). go grow some biomass, periodt 💅🌾💖

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