Simon Willison’s Weblog

4th January 2008 - Link Blog

Encoded Polyline Algorithm Format. Google Maps does some pretty crazy bit mangling to create compressed versions of lat/long pairs.

Posted 4th January 2008 at 4:12 pm

Recent articles

Vibe coding SwiftUI apps is a lot of fun - 27th March 2026
Experimenting with Starlette 1.0 with Claude skills - 22nd March 2026
Profiling Hacker News users based on their comments - 21st March 2026

This is a link post by Simon Willison, posted on 4th January 2008.

encoding 5 google-maps 53 latlong 1 polyline 1

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe