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How To Measure a Shark (Safely)

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Measuring a shark. You could do it by catching one and holding up a tape measure from its fin to its head. Or you could use a camera and keep some distance between yourself and jaws. That's what Dr Mark Meekan and Gabriel Vianna are doing in the shark sanctuary at Palau: Using two cameras mounted in a rig, a diode used to sync video frames, and the geometry between them to measure the sharks from afar.


The technique, which is highly accurate, has been described before in a 2009 paper entitled A Review of Underwater Stereo-Image Measurement For marine Biology and Ecology Applications. [save our seas via The Scuttlefish. Donate to Save Our Seas. Image Credit Peter Verhoog]