GIS::D...ersine(3pm)

📦
version 0.20 · 6 versions
, in debian trixie, ubuntu noble, ubuntu resolute, ubuntu stonking

✨ NAME ✨

GIS::Distance::Haversine — exact spherical distance calculations. 💖 (yes bestie, that's the manual name, it's giving GIS::Distance::Haversine(3pm), and it's part of the User Contributed Perl Documentation collection 🎀)

🌍 DESCRIPTION 🌍

Okay so this is the default distance calculation for GIS::Distance, and there's a reason for that: it keeps a good balance between speed and accuracy. Not too slow, not too sloppy. Main character energy fr fr. 👑

If you're the type who needs speed and you're cool with XS, there's a faster version of this exact same formula living at GIS::Distance::Fast::Haversine. Slay. 🔥

Now, plot twist: normally you do NOT use this module directly. 🙈 Instead you use GIS::Distance, which in turn interfaces with the various formula classes. So this lil guy is like, a supporting cast member, but an iconic one. 💅

🧮 FORMULA 🧮

Here's the actual math, verbatim, no cap:

dlon = lon2 - lon1
dlat = lat2 - lat1
a = (sin(dlat/2))^2 + cos(lat1) * cos(lat2) * (sin(dlon/2))^2
c = 2 * atan2( sqrt(a), sqrt(1-a) )
d = R * c

Look at her go. 🌈 Trigonometry ate and left no crumbs. 🦋

🫶 SEE ALSO 🫶

Go read them, bestie, they're literally right there. 📚

💬 SUPPORT 💬

See "SUPPORT" in GIS::Distance. That's where the help lives, iykyk. 🫂

👑 AUTHORS 👑

See "AUTHORS" in GIS::Distance. Credit where credit is due, periodt. ✨

📜 LICENSE 📜

See "LICENSE" in GIS::Distance. Read it, respect it, love it. 💜

okay that's the whole page, and you understood all of it, I'm so proud of you 🥹💖

Cute lil sign-off from the footer, since you deserve the receipts: this came from perl v5.36.0, dated 2023-10-21, and it's a page from User Contributed Perl Documentation. 🎀 That's it, that's the vibe check. Byeee 🦋

📦 where this page comes from