This is still a rough prototype. Roads in particular are pretty messy, and the performance is bad.
Attributions
OpenStreetMap was used to construct buildings, roads, and other features. The copyright for this data is owned by OpenStreetMap contributors. OpenStreetmap is available under the Open Database License. https://www.openstreetmap.org/copyright
OpenStreetMap and other map data is transformed using the following program. This library uses several other open source libraries. https://github.com/MDFL64/cartographer-cli
Elevation data is provided by the United States Geological Survey. This data is availabe free for charge and without use restrictions. https://www.usgs.gov/3d-elevation-program/