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High-resolution LiDAR and IFSAR. You can download some US elevation data for free from the USGS[1], other countries may have similar datasets available.

[1]: https://viewer.nationalmap.gov/basic/?basemap=b1&category=ne...



Australia has a high res lidar available for free, about 300gb, I've been wanting to import it into blender but need a new hdd/more space to do it.

I think the data was found here http://www.ga.gov.au/scientific-topics/national-location-inf...


http://elevation.fsdf.org.au/ is starting to get data from LIDAR on a more local level, NSW/Sydney has some point cloud data up (presumably not just elevation but buildings/man made structures?) with more coming online every month until July 2018


Sorry was about 300gb for nsw, not sure of other states/territories


and probably photogrammetry from the arial photos.


Which is what Google and Apple do. Pretty good, but it doesn't work well with trees




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