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Fish surveys
The major use for SeaGIS hardware and/or software is in fish surveys.
EventMeasure
is used in single-camera applications to annotate footage and determine MaxN (and cumulative MaxN) statistics.
In stereo applications, CAL is used to perform camera calibrations, while
EventMeasure (Stereo) is used for MaxN determination as well as making 3D
length/pose/position measurements. The technique is applied to baited and unbaited remote camera surveys, as well as various
styles of transect survey.
Using appropriate cameras and stereo configurations, animals ranging in size from pupfish to whale sharks can be measured.
See here for further reading.
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| Recording a grey nurse shark (© Justin Gilligan) |
Stereo measurement of a whale shark |
Recording pupfish in Devils Hole, Death Valley National Park, Nevada USA (pictures from United States
National Parks Service)
Others ...
Using stereo imagery to identify species and correlate acoustic return with animal size and orientation
(articles).
Benthic transect analysis with single images (using TransectMeasure),
or using stereo imagery (articles).
Sponge measurement, and volume and surface area estimation
(articles).
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Generating surfaces for monitoring applications.
Tufa image (left image of a stereo pair) |
Corresponding tufa surface, derived from stereo measurement with
automatic image matching |
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