I run geopulse and log my current position to it using gpslogger. while the details might change i always want something like this: a way to know where i've been at any given point in time.

Some years ago i was gifted a map which would have you scratch out countries you had visited. I wanted something like that, but digital and ideally created automatically.

Since I had an upcoming trip to Japan, my goal was simple: setup enough of a system to turn my gps logs into "unlocked prefectures".

challenge 1: get the boundary data

https://osm-boundaries.com

challenge 2: get the gps logs from gepulse

geopulse is at the core an instance of postgis and Java service + frontend. I just have to connect to the database and select mytime window of logs to process.

challenge 3: match to boundary=administrative

I use geopandas for the spatial calculations and process the final result into pmtiles using tippecanoe.

challenge 4: building the map

maplibre duh