In the United States, people can fly model aircraft without approval from the Federal Aviation Administration if they keep the drone in line of sight, lower than 400 feet above ground and away from airports and air traffic.

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The anti-aircraft weapon I used was a 1940s era model from the Soviet Union.

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The Navy model will operate from aircraft carriers, while the Air Force version will be based on land.

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This digital elevation model (DEM) will be put to myriad uses - everything from improving the safety of aircraft navigation to understanding better which areas of ground are most at risk during a flood.

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He and his colleagues have made a start on this at Army City, where they are creating a system that will swallow, digest and combine data from satellites, aircraft and ground-based sensors, aligning them in a single, computer-based model of the site.

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