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.

    Grey nurse shark Whale shark
    Recording a grey nurse shark (© Justin Gilligan) Stereo measurement of a whale shark

    Devils Hole, Nevada USA Devils Hole, Nevada USA
    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).

  • Tufa image Tufa surface
    Generating surfaces for monitoring applications.
    Tufa image (left image of a stereo pair)
    Corresponding tufa surface, derived from stereo measurement with automatic image matching

    Last updated 6th December 2012   SeaGIS homepage
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