Simon Willison’s Weblog

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

Feed a video to a vision LLM as a sequence of JPEG frames on the CLI (also LLM 0.25) - 5th May 2025
Two publishers and three authors fail to understand what "vibe coding" means - 1st May 2025
Understanding the recent criticism of the Chatbot Arena - 30th April 2025

google-maps 53 latlong 1 polyline 1 encoding 5