We have no meanings for "urban canyons" in our records yet.
1 Soldiers are more easily ambushed in urban canyons and inside buildings.
2 The Pentagon's brains would like to see swarms of tiny drones zipping through urban canyons , looking for enemies.
3 And that means more than just next-generation sensors that can penetrate foliage or peer inside " urban canyons . "
4 This is especially true because the systems will also have to function perfectly in urban canyons and in inclement weather.
5 A three-signal world will mean always-on GPS that's accurate to within 3 feet, even indoors and in concrete urban canyons .
6 Urban canyons formed between tall buildings, trapping heat at the street level.
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