Show HN: Serverless reverse geocoding for WebMCP, ESP32, and RP2040

Category: library

Tags: reverse-geocoding, embedded, offline, gis, microcontroller

Score: 6.7/10 (Innovation: 7, Technical: 7, Documentation: 5, Utility: 6)

Galuchat is a serverless reverse-geocoding system that stores administrative boundary data as a compressed raster segmentation image, enabling offline lookups on devices ranging from browsers to microcontrollers like ESP32 and RP2040. It avoids external API calls by embedding datasets as small as 52 KiB for Japan, making location resolution possible without connectivity.

Target audience: embedded developers, backend devs, GIS engineers, IoT developers

Repository: https://nyatla.github.io/galuchat/

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