Show HN: Alidade – an open-source Web-GIS where the map is one JSON document

Category: other

Tags: web-gis, maplibre, postgis, geospatial, typescript, react, fastapi, vector-tiles

Score: 7.3/10 (Innovation: 7, Technical: 8, Documentation: 8, Utility: 6)

Alidade is an open-source Web-GIS platform that treats the map as a single JSON document, diffing state changes and adapting them to MapLibre for a renderer-agnostic core. It supports PostGIS vector tiles, satellite imagery mosaicking, 3D terrain and models, WebSocket live assets, and geodesic drawing, all without any API keys. Its clean architecture (core/maplibre/three separation) and thorough testing make it a strong reference for declarative geospatial rendering.

Target audience: full-stack and GIS developers, geospatial engineers, data engineers

Repository: https://github.com/AysanZ/alidade · TypeScript · Apache-2.0 · 10 stars

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