r.latlong(1grass)

✨ r.latlong ✨

okay bestie, gather round, because we're talking about r.latlong(1grass) — the GRASS module that makes you a latitude/longitude raster map and honestly? it's giving underrated icon. 💖

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🌸 NAME 🌸

r.latlong — creates a latitude/longitude raster map 🗺️✨

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👑 KEYWORDS 👑

raster, latitude, longitude, projection

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🎀 SYNOPSIS 🎀

r.latlong
r.latlong --help
r.latlong [-l] input=name output=name  [--overwrite]  [--help]
[--verbose]  [--quiet]  [--ui]

🦋 Flags

• -l — Longitude output. like, you want longitude instead of latitude? this is the girl. 💅
• --overwrite — Allow output files to overwrite existing files. no cap, it will just bulldoze whatever's already there.
• --help — Print usage summary
• --verbose — Verbose module output
• --quiet — Quiet module output
• --ui — Force launching GUI dialog

🍓 Parameters

• input=name [required] — Name of input raster map
• output=name [required] — Name for output latitude or longitude raster map

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💜 DESCRIPTION 💜

so here's the tea ☕: r.latlong creates a latitude (degree decimal) map — or a longitude map if you pass the -l flag — from any map in any projection, and it does it using the PROJ library. literally any projection, bestie, it does not care. 🌈

and the reason you'd want this? it's an input to r.sun and i.evapo.potrad. so if you're doing solar or evapotranspiration stuff, this map is your backstage pass. 🎟️✨

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📝 NOTES 📝

The PROJ website. (yes that's the whole note. short queen. 👑)

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💀 TODO 💀

Datum transform is not implemented — the same datum is taken as output. so, like, don't come for it about datums, it's simply not doing that rn. 🫶

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🔥 EXAMPLE 🔥

g.region raster=elevation -p
r.latlong input=elevation output=latitude

look at her go ✨ region set, latitude map made, main character energy only.

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🌟 SEE ALSO 🌟

r.sun, r.sunhours

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🫶 AUTHOR 🫶

Yann Chemin, International Rice Research Institute, The Philippines

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💅 SOURCE CODE 💅

Available at: r.latlong source code (history)

Latest change: Saturday Nov 15 06:40:22 2025 in commit: e9e31a04af129ae3fcac227885cbbd77ce70d803

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

© 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual

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and that's the whole page, no notes 💖

k bye bestie, that was r.latlong(1grass) from GRASS 8.5.0 — go make some latitude rasters and slay the day ✨🌸🦋 periodt. 💅