Asian Surveying & Mapping
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Singapore Geospatial Festival 2021
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Rajnath Singh unveils South Asia’s largest Genomics research centre in Hyderabad
Hyderabad: Nucleome on Thursday unveiled South Asia’s largest and most...
New satellite system could improve Australia’s water quality management
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Egyptian Space Agency says Egypt to launch 4 satellites in 2022
Chief Executive Officer of the Egyptian Space Agency Mohamed...
Government launches new portal to facilitate geospatial planning of MGNREGA assets
The portal will serve as a repository of assets...

June 16th, 2011
Gunshot Echoes Used to Map Caves’ Interior

A portable system, created by David Bowen of Acentech in Cambridge, Massachusetts, consists of two microphones placed at the entrance of a cave or tunnel, which are hooked up to a laptop loaded with software designed to decode acoustic signals. A gun is fired four or five times, with about 5 seconds between each shot. Fifteen to 20 seconds later the map appears on the laptop’s screen, with simple graphs that display the area of the cave at different distances, and written explanations of the data, such as “30 feet ahead is a large opening”. A portable subwoofer can be used in place of a firearm as the source of the sound waves. Read More