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The imaging Center

THE IMAGING CENTER

 

 

The Imaging Center coordinates the acquisition, management and applied uses of images and other output from underwater and air-borne remote sensing and satellites for research, monitoring and teaching.

 

Imaging Center website

Instrumentation and resources

  • The Albert Lucas station vessel
  • Multi-beam echo sounder: 
    The Imaging Centre is equipped with a sonar system for high-resolution mapping of the seabed (e.g. 1 metre resolution for a depth of 15 metres). It has a shallow-water Reson SeaBat 8101 multi-beam echo sounder (0 to 200 meters), which can be used temporarily on non-oceanographic vessels with the use of a removable pole or a shaft in the hull.
  • The DRELIO drone
    This drone was built in collaboration between IUEM’s Oceanic Domains Laboratory [Laboratoire Domaines Océaniques] and Université Claude Bernard de Lyon. Since 2006, the DRELIO drone has been flown over several beaches in the Brest area to obtain very-high-resolution aerial photographs.
  • This device is composed of a model helicopter equipped with a photogrammetric base (video camera, camera, GPS) and can perform image acquisition in very high winds (100km/h). In order to overcome piloting difficulties, an autopilot system was installed, thereby enabling the flight parameters to be set from the ground. Its user-friendly design, relatively low cost and adaption to difficult metrological conditions all make the DRELIO drone highly suitable for coastal zone monitoring. The photographs obtained enable Digital Elevation Models (DEMs) to be generated for studying its topography and morphosedimentary evolution. Repeated flights allow DEMs to be compared over time and, therefore, for sediment movements to be quantified.
  • Terrestrial Laser Scanner (TLS)
    The scanner enables topographic measurements to be made with high spatial resolution and great precision. By repeating these measurements, the morphosedimentary evolution of the coastal strip can be quantified. The TLS emits a laser beam (Infra-Red – 1.55 µm) which reflects off a point in the environment and returns to the TLS. From the signal’s outward and return time, a precise calculation of the distance between the point and the TLS can be made. The TLS sweeps an entire area (horizontally and vertically), measuring the position of ≈10 000 points/second. Once assembled, all of the measured points form a 3D “cloud” of points. The spatial resolution varies from a few millimetres to dozens of centimetres, with precision of a few centimetres. The 3D point cloud must then be correctly placed in a geographical reference frame using targets, whose positions have been measured using differential GPS.
  • The 3D point cloud is interpolated on a regular grid to create a Digital Elevation Model.
Picture of the month

Drague.jpg