Monument maps for entire Schleswig-Holstein and its single districts:
The maps are based on the Open Data Day 2025 map by Thomas Tursics. As data source, the maps use the prebuilt GeoJSON distributions from my side project opendata.tomkyle.net: Historische Kulturdenkmale in Geo-Formaten
as authored by Thomas Tursics
We met in Flensburg on the International Open Data Day 2025 on March 1st. After a few keynote speeches in the morning, we built online maps from Scratch in the afternoon. I took up the idea of the new list of monuments from Schleswig-Holstein and visualized it on a map.
as authored by Thomas Tursics
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The basic structure of a map was set up with HTML, JS, CSS and a little boilerplate. I chose MapLibre GL JS because it allows you to use vector maps that can be zoomed, rotated, tilted as desired and thus also display 3D buildings.
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In order to display data on the maps, I looked for GeoJSON files in the Open Data Portal of Schleswig-Holstein, which also contain data from Flensburg. I found these: https://opendata.schleswig-holstein.de/dataset/geodaten-denkmalliste-sh-2025-03-01
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Unfortunately, the contents of the GeoJSON file are not displayed on the map. In QGIS I changed the projection from UTM 32 to WGS 84 and thus converted all coordinates.
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The resulting file was still too large to upload to GitHub. That's why I only filtered out the monuments in Flensburg in QGIS.
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Finished.
The raster data map layer from OK Lab Flensburg (https://tiles.oklabflensburg.de/fosm/{z}/{x}/{y}.png) was presented and used in the workshop. I couldn't manage that and switched to the vector layer from Basemap.de.
