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Squadron of Biplane Spectators

Welcome to our TOP award! Having collected 6,000 or more points, you are all topflight volunteers! We know you by (user) name. Thank you for contributing so much to The National Map. Our squadron may not be big, but it packs an awesome punch!

World War I saw the first use and rapid development of airplane-based photographic reconnaissance. Proving to be more agile and reliable than balloons, pigeons, or rockets. Both sides of the conflict used aerial photographs to monitor the expansion of trenches and troop movements. From these activities during war time evolved the science of photogrammetry.

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