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Olex global bathymetry database

Assembled from thousands of commercial fishing vessels, the Olex global bathymetric database has more than two billion soundings covering an extensive area. All the data are contributed voluntarily and in return for sharing their own data an Olex user will gain access to the shared database. In operation now for more than a decade this cooperative approach has produced one of the largest collections of marine data in the world.

In addition to its broad spatial coverage the Olex data set is of a very high resolution (5 metres), whereas other global bathymetry datasets are typically at a resolution of hundreds or thousands of metres.

The data are collected using standard commercial single-beam echosounders and GPSs. The data produce very good results when compared to hydrographic-standard multibeam. The data are corrected with predicted tides and use local chart datum as their reference level.