A5: A Global, Millimeter-Accurate Geospatial Index
2025-05-13
A5 is a geospatial index partitioning the world into pentagonal cells at 32 resolution levels, with the smallest cell under 30mm² and near-equal area across levels. It simplifies spatial data representation and analysis, enabling calculations of correlations between variables (e.g., elevation and crop yield) and aggregation of point data to understand spatial distribution (e.g., holiday rental density). Implemented in TypeScript, A5 is open-source under the Apache 2.0 license. Compared to other DGGS systems, A5 boasts uniform cell sizes, extremely high resolution (30mm²), and minimal global cell area distortion. This stems from its unique pentagonal tiling of a dodecahedron, minimizing geometric distortion during projection.
Tech
Geospatial Index