Simon Willison’s Weblog

OpenStreetMap: QuadTiles. Fascinating explanation of a proposal for replacing lat, lon pairs in the OpenStreetMap database with a QuadTile-based addressing system.

Posted 10th September 2009 at 3:54 pm

Recent articles

Talking AI and jobs with Natasha Zouves for News Nation - 30th May 2025
Large Language Models can run tools in your terminal with LLM 0.26 - 27th May 2025
Highlights from the Claude 4 system prompt - 25th May 2025

quadtiles 1 openstreetmap 50 algorithms 15 gis 56

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