i.evapo.mh(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

💧 i.evapo.mh — the manual page bestie 💧

okay so this is i.evapo.mh(1), straight out of the GRASS GIS User's Manual, and it's the one that does the evapotranspiration math ✨ it computes the evapotranspiration calculation, modified or original Hargreaves formulation, 2001. that's the whole vibe. no cap.

🏷️ NAME

i.evapo.mh — Computes evapotranspiration calculation modified or original Hargreaves formulation, 2001.

🔑 KEYWORDS

imagery, evapotranspiration

like… it's an imagery module and it's about evapotranspiration. iykyk 🌿

📜 SYNOPSIS

i.evapo.mh
i.evapo.mh --help
i.evapo.mh [-zhs] netradiation_diurnal=name average_temperature=name
minimum_temperature=name maximum_temperature=name  [precipitation=name]
output=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

🚩 Flags:

  • -z — Set negative ETa to zero. like, if it's negative bestie we're calling it zero, periodt.
  • -h — Use original Hargreaves (1985)
  • -s — Use Hargreaves-Samani (1985)
  • --overwrite — Allow output files to overwrite existing files. yes she will absolutely bulldoze what's there, so be sure.
  • --help — Print usage summary
  • --verbose — Verbose module output
  • --quiet — Quiet module output
  • --ui — Force launching GUI dialog

🧚 Parameters:

  • netradiation_diurnal=name [required] — Name of input diurnal net radiation raster map [W/m2/d]
  • average_temperature=name [required] — Name of input average air temperature raster map [C]
  • minimum_temperature=name [required] — Name of input minimum air temperature raster map [C]
  • maximum_temperature=name [required] — Name of input maximum air temperature raster map [C]
  • precipitation=name — Name of precipitation raster map [mm/month]. Disabled for original Hargreaves (1985) — so if you're running the original Hargreaves, this one just… doesn't apply, bestie 🙈
  • output=name [required] — Name for output raster map [mm/d]

🌈 DESCRIPTION

i.evapo.mh calculates the reference evapotranspiration (ET) after Hargreaves et al. (1985), Hargreaves and Samani (1985) and the Modified Hargreaves version found in Droogers and Allen (2002).

three whole formulations, one icon. she contains multitudes 💅

📚 REFERENCES

  1. Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural benefits for Senegal River Basin. Journal of Irrigation and Drainange Engineering, ASCE, 111(2):113-124.
  2. Droogers P, Allen RG, 2002. Towards a simplified global reference evapotranspiration equation. Irrigation Science.
  3. Droogers, P., Allen RG. 2002. Estimating reference evapotranspiration under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.
  4. Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspiration from ambient air temperature. American Society of Agricultural Engineers (Microfiche collection)(USA). no. fiche no. 85-2517.

👀 SEE ALSO

i.evapo.pt, i.evapo.pm, i.evapo.time, r.sun

the whole evapo cinematic universe fr fr 🎬

👑 AUTHOR

Yann Chemin, GRASS Development team, 2007-2016

💻 SOURCE CODE

Available at: i.evapo.mh source code (history)

Accessed: Saturday Jan 17 05:41:39 2026

Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index

and that's the whole page, bestie 🫶 big love to the GRASS Development Team for the copyright, © 2003-2025, and this lil beauty is from the GRASS GIS 8.4.2 Reference Manual — GRASS 8.4.2, accessed Saturday Jan 17 05:41:39 2026. slay, go compute some ET 💖✨🌸

📦 where this page comes from