S2 Cells: Hilbert space filling curves for indexing of spatial data
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Aaditeshwar Seth
Jan 25, 2026, 10:37:58 PMJan 25
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Roughly speaking, a 64-bit representation of every point on earth but adjustable to whatever zoom level you want to operate. The underlying mathematical function is the Hilbert space filling curve with the key property of converting 3D points to a 1D index which has spatial locality. Ends up being useful as a spatial index for optimized storage and retrieval of geospatial data, E.g. https://medium.com/radiant-earth-insights/using-duckdbs-hilbert-function-with-geop-8ebc9137fb8a
Adi
Co-founder, Gram Vaani; Co-founder, CoRE Stack
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