What you see in the pictures is probably one of the best large scale camouflages ever attempted. In order to protect the Lockheed Burbank Aircraft Plant from air attacks, there was a nee to hide it which is no easy job. So it was covered in netting which made it look like a rural setting when seen from air. Even though this was done a long time ago, the ingenuity and imagination required for the project is still talked about.
These pictures you see were taken in 1940s by the Army Corps of Engineers from US. The netting went over most buildings and had tree like structures on top too, under which there was normal activity all hidden from the outside eyes. As Lockheed was a large center of military aircraft manufacture. It was also an active base for P-38 fighters. They could not afford to lose it to an air attack for which Japan was feared for.