These days, they (or
any every other power) can get most of it for free from Google Earth (fantastic resolution with the professional version, which used to cost ~$400, but now appears to be free.) One can annotate any or all of it to hearts content, including adding 3D models of buildings (where others have not done so already.) It’s an extremely versatile and dimensionally accurate platform. Satellite mapping having developed to the high art it now is, most of the major military powers would be able to spot a new gopher hole in your back yard before you would, if they were looking for gophers.