Where do you get the terrain elevation data? What resolution is it? I've been looking for good elevation data for another project.
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Nextzen has freely available DEM tile data to zoom level 15, so about 5 meters/pixel. You need a free API key [1]
Mapbox has paid DEM data to zoom level 20, but I think it's just zoom level 15 scaled up (but the data is cleaner and more recent) [2]
Nextzen also open-sourced their elevation tile generator, but I haven't tried to generate my own tiles [3]
[1] https://www.nextzen.org/#terrain-tiles
[2] https://docs.mapbox.com/help/troubleshooting/access-elevatio...