Immich Traditional Chinese Geodata, Part 2: The Data Pipeline
The previous post in this series, How Reverse Geocoding Works, took apart the way Immich reads geographic data: a handful of plain text files get imported into PostgreSQL at startup, and a nearest-neighbour query resolves a place name when a photo is uploaded. Since swapping the files is enough to swap what gets displayed, the remaining question is about those “better files” themselves.
This post takes apart the immich-geodata-zh-tw pipeline, from each country’s official map data all the way to the release.tar.gz that users download.