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by ECOLA last modified Nov 12, 2013 10:56 AM
bathymetry processing

For shelf and coastal ocean modelling, bathymetry is one of the most critical parameter. In along-shore configuration, accuracy of bottom topography needs to be better than 1 meter, and resolution close to 100m.


Digital terrain model construction

DTM are built from three main type of data:

  • depth soundings, multi-beam data, LIDAR
  • elevation DTM (such as SRTM)
  • pre-existing DTMs (to constrain transition at DTM boundaries)

Unstructured mesh techniques (linear triangles) are used to map bathymetry and elevation on a regular (structured) grid. Reference levels (ellipsoid, geoid, mean sea level etc...) can be dealt with to insure metric consistency.

Numerical terrain model construction example

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