Just wondering, how does this impact national security? When most of the planet is well-covered by Satellite imagery, isn't finding an installation with 500m difference a matter of searching images?
After all, launching all those mapping satellites was expensive. They did it for some reason. ;)
The goal is to prevent uprisings or riots from having accurate data, not to prevent the US, for example, from having accurate data.
This is about citizenry control for internal threats, not external ones.