Hydrographic survey is the mapping of the seabed or water bed to detect foreign objects and soil layers. T&A Suveys' hydrographic an geophysical experts perform these survey using hydrographic and geophysical measurement techniques and survey vessels.
Examples of hydrographic surveys performed bij T&A are:
Obstacle investigation: detection of objects, cables or tubes in the seabed or water bed.
Sludge layer thickness determination of sediment layers.