Where do we get it? Only publicly available sources. Usgs has a great portal. Private data is too expensive to get. I was quoted 6 figures for a larger area. They were going to fly a plane and capture it :)

What resolution? Totally depends on the area the customer would like to cover. If it’s their ranch or property, we usually need 1-meter. If it’s a mountain range than 30-Meter works.

It mainly depends on the resolution limit for 3D printing. So it also depends on the size of the model they want.

Unfortunately not all areas are covered with high res