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Signed-off-by: Robert Günzler <r@gnzler.io>

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+<p>
+	I run <a href="https://github.com/tess1o/geopulse">geopulse</a>
+	and log my
+	current position to it using <a href="https://gpslogger.app/">gpslogger</a>.
+	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.
+</p>
+
+<p>
+	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.
+</p>
+
+<p>
+	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".
+</p>
+
+<h2>challenge 1: get the boundary data</h2>
+
+<p>
+	https://osm-boundaries.com
+</p>
+
+<h2>challenge 2: get the gps logs from gepulse</h2>
+
+<p>
+	geopulse is at the core an instance of <a href="https://postgis.net/">postgis</a>
+	and Java service + frontend. I just have to connect to the database and select
+	mytime window of logs to process.
+</p>
+
+<code>
+	TODO
+</code>
+
+<h2>challenge 3: match to boundary=administrative</h2>
+
+<p>
+	I use <a href="#geopandas">geopandas</a>
+	for the spatial calculations and
+	process the final result into <a href="#protomaps">pmtiles</a>
+	using
+	<a href="#tippecanoe">tippecanoe</a>.
+</p>
+
+<h2>challenge 4: building the map</h2>
+
+<p>
+	maplibre duh
+</p>