• Source: Ocean data acquisition system

An ocean data acquisition system (ODAS) is a set of instruments deployed at sea to collect as much meteorological and oceanographic data as possible. With their sensors, these systems deliver data both on the state of the ocean itself and the surrounding lower atmosphere. The use of microelectronics and technologies with efficient energy consumption allows to increase the types and numbers of sensor deployed on a single device.




Definition


According to Intergovernmental Oceanographic Commission and World Meteorological Organization (WMO), "ODAS means a structure, platform, installation, buoy, or other device, not being a ship, together with its appurtenant equipment, deployed at sea essentially for the purpose of collecting, storing or transmitting samples or data relating to the marine environment or the atmosphere or the uses thereof."




Use


Each hour, the data gathered by the system is transferred to the WMO's Global Telecommunications System by a geostationary satellite after having gone through a number of quality checks. Real-time data with information on the maritime environment can then be used for forecasts of physical states like weather, ocean currents or wave conditions which, in turn, may serve to warn seafarers of unfavourable conditions in the area.




ODAS types



ODAS can be mounted on the following structures:

Lighthouses
Lightvessels
Towers
Offshore platforms
Buoys
ODAS buoys are not navigational aids but have been included into the IALA Maritime Buoyage System. The structures have a fixed geographical position.




Data


Data gathered by an ODAS may include the following parameters:

Air temperature
Atmospheric pressure at sea level
Wind direction
Wind speed including gusts
Sea state
Wave height
Sea surface temperature




Disadvantages


ODAS buoys are expensive to obtain and need to be deployed by specialised vessels.




References

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