topic_solar(1grass)

🌞 Topic: solar 🌞

okay bestie, gather round, because this is the solar topic page and it's literally the whole sun-girlie starter pack 💛✨ It's giving "I want to know where the sun is, how much of it I'm getting, and who's standing in my light." No cap.

Here's the lineup, all of them living under the solar umbrella 👑

• r.horizon — computes the horizon angle height from a digital elevation model 🏔️ like, it looks at your terrain and goes "yeah the sun's gonna be blocked by that mountain over there at this exact angle, sorry babe."
• r.sun — the solar irradiance and irradiation model ☀️ this is the main character of the whole topic ngl. Sun power in, sun power out.
• r.sunhours — calculates solar elevation, solar azimuth, and sun hours 🕐 it's basically the sun's little calendar-and-compass moment. Where is it, how high is it, how long is it showing up today.
• r.sunmask — calculates cast shadow areas from sun position and an elevation raster map 🌚🗺️ who's in the shade, who's in the spotlight, all decided by where the sun is standing.

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See also the corresponding keyword solar for additional references 🔍 lowkey the best way to keep the rabbit hole going.

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okay that's the whole vibe check, bestie, and yes I'm obsessed — this page is © 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual 💖 so shoutout to the GRASS devs fr fr, and this was the topic_solar(1grass) page from the GRASS User's Manual, straight out of the GRASS 8.5.0 era 🎀 mwah, slay, bye 💅✨