Show HN: A5 v1.0

Category: library

Tags: geospatial, grid-system, spatial-indexing, dggs, space-filling-curve

Score: 8.0/10 (Innovation: 8, Technical: 9, Documentation: 8, Utility: 7)

A5 is a Discrete Global Grid System (DGGS) that represents any geographic location, line, or polygon as a pentagonal cell with a compact 64-bit integer ID. Its v1.0 release introduces a new teohedral space-filling curve that enables efficient set operations on compacted cell collections and dramatically faster polygon filling, making it a compelling alternative to H3 and S2 for large-scale geospatial analysis.

Target audience: geospatial developers, data engineers, GIS analysts, researchers

Repository: https://a5geo.org/blog/2026/10/14/a5-v1

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