Show HN: Landcheck – is coordinate is on land?

Category: library

Tags: dggs, geospatial, quadtree, icosahedron, exact-nesting, triangular-grid, python-library, javascript-sdk, cloudflare-worker, global-grid

Score: 7.8/10 (Innovation: 8, Technical: 9, Documentation: 8, Utility: 6)

Trifold T3 is a hierarchical triangular DGGS (discrete global grid system) with exact nesting, enabling lossless multi-resolution aggregation of geospatial data using a quadtree over an icosahedron. It includes a Python library, JavaScript SDK, Cloudflare Worker, and a live demo, supporting compact base32 addresses and efficient hierarchical operations. The project stands out for its rigorous mathematical foundation, practical tooling, and potential to simplify global-scale geospatial analysis and land/sea classification.

Target audience: backend devs, data engineers, geospatial analysts, data scientists

Repository: https://jaakla.github.io/trifold/landcheck.html · Python · MIT

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