During World War I, this stretch was one of the most heavily bombed, gassed, burned, and bullet-riddled places along the Western Front. A century later, laser-shooting planes are uncovering its past. (From 2018)
—each beam of light bounces off the landscape below, and some of its photons return to the aircraft. By timing how long it takes those photons to make the round trip, the sensor calculates the elevation of whatever those photons touch. Geographers knit the resulting clouds of results into a 3-D map. The one the Belgian government released—for free!—in 2013 was accurate down to 30 centimeters.
This 12 percent is pristine stuff. Many of these wooded areas hadn’t been messed with since the war. In one of the more remarkable lidar finds, Gheyle identified traces of where a small group of Allied soldiers made camp for the night, including the protective sandbags around the tents, in a copse of trees some seven miles behind the front.
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