I work at a startup that uses similar technology to make large-scale 3D models, but using your own dataset https://www.one3d.ai. You can check a demo here https://app.one3d.ai/twins/9763/?invcode=7asheX17, but the surprising thing is that they have pretty good quality without close-up aerial photography. We need drones to take photos, but a doubt they used anything closer than a plane.