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

Writing about Agentic Engineering Patterns - 23rd February 2026
Adding TILs, releases, museums, tools and research to my blog - 20th February 2026
Two new Showboat tools: Chartroom and datasette-showboat - 17th February 2026

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

encoding 5 google-maps 53 latlong 1 polyline 1

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