i.ortho.elev(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

✨ i.ortho.elev ✨

okay bestie, welcome to the GRASS GIS User's Manual 💖 this little icon is i.ortho.elev(1) and she is here to help you pick or tweak the elevation model you're gonna orthorectify with. no cap.

🌸 NAME 🌸

i.ortho.elev — select or modify the target elevation model. that's it, that's the whole job, and she does it flawlessly 💅

🎀 KEYWORDS 🎀

imagery, orthorectify — yes, both, she contains multitudes ✨

🦋 SYNOPSIS 🦋

i.ortho.elev
i.ortho.elev --help
i.ortho.elev [-p] group=name  [project=name]   [mapset=name]
[elevation=name]   [math_expression=string]   [units=string]
[null_value=string]   [--help]  [--verbose]  [--quiet]  [--ui]

look at her. so structured. so demure. 🫶

💜 Flags 💜

  • -p — prints the elevation map that's currently selected and then dips out. just a peek, no changes. 👀
  • --help — prints the usage summary. the "explain urself" button.
  • --verbose — verbose module output. she will over-share and honestly? we love that for her.
  • --quiet — quiet module output. she will keep it cute and say nothing extra.
  • --ui — force-launches the GUI dialog. main character energy, but graphical. 🖥️✨

🍓 Parameters 🍓

  • group=name [required] — the name of the imagery group you're ortho-rectifying. yes it's required, she needs to know who she's working with, she's not a mind reader 😭
  • project=name — project (location) name. aka the name of the target project (location).
  • mapset=name — name of the target mapset. default is the current search path, so if you say nothing she'll just look where you're standing 🧚
  • elevation=name — the name of the elevation map to use for ortho-rectification. the whole point, lowkey.
  • math_expression=string — a math expression to convert to real elevation. for when your numbers are living a lie and need a glow-up into actual elevation values. ✨
  • units=string — the unit of the elevation map. options are: miles, feet, meters, kilometers, acres, hectares.
  • null_value=string — the no data value. the "she's not here right now" value. 🙈

🌈 DESCRIPTION 🌈

so i.ortho.elev is the icon you call to select or modify the target elevation model for orthorectification of imagery. 💖

this elevation model is genuinely essential — not optional, not a nice-to-have — for both:

  • the computation of photo-to-target parameters, and
  • the actual orthorectification of imagery group files.

the elevation model you select should cover the entire area of the image group you're about to orthorectify. like, the whole thing. don't be out here half-covering your scene, it's giving chaos. 😭

optionally, if your elevation data is scaled (not real values yet), you can convert it to real elevation values by specifying a mathematical expression. cute, convenient, we stan. 💅

👑 SEE ALSO 👑

  • i.ortho.photo
  • i.ortho.camera
  • g.gui.photo2image
  • g.gui.image2target
  • i.ortho.init
  • i.rectify

the whole squad, fr fr. go read them too, they're all iconic in their own way 🫶

⭐ AUTHORS ⭐

  • Mike Baba, DBA Systems, Inc.
  • Bugfixes and enhancements for GRASS GIS 7 by Markus Metz

legends, both of them. 💜

🌸 SOURCE CODE 🌸

Available at: i.ortho.elev source code (history)

Accessed: Saturday Jan 17 05:41:43 2026

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and that's the page bestie!! this whole thing lives in the GRASS GIS 8.4.2 Reference Manual, brought to you by the GRASS Development Team, © 2003-2025. and yeah, the version tag at the bottom says GRASS 8.4.2 too, so you know it's fresh. now go orthorectify something gorgeous 💅✨💖

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