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by bdcravens 540 days ago
My first thought: "introducing? The S2 has been out for a while!"

https://www.sunlu.com/products/new-version-sunlu-filadryer-s...
1 comments
01HNNWZ0MV43FF 540 days ago
Google had it years ago! http://s2geometry.io/devguide/s2cell_hierarchy
link