I established GeoSim’s initial foundation and built the very basic data pipeline. I set up the project structure, defined types I will use in the future such as bounding boxes and OSM related stuff, and integrated the OpenStreetMap Overpass API to fetch building related data such as geometry for a predefined test area for now. I also added a simple interface to display the raw data before I actually start converting it into actual 3D buildings.
I also ran into something called CORS issue when calling Overpass directly from the browser, so I added a Vercel serverless API route to request Overpass and that fixed it. Along the way I also came through many other weird API related issues so I eventually switched from the overpass-api.de endpoint to another public Overpass instance hosted by Mail.ru and now stuff seems to be working.
Next, I’ll move from only displaying the raw OSM building data to turning it into actual 3D geometry using Three.js.