Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.

Bathymetric datasets, collected before 1970, are historical surveys acquired with leadlines (and single-beam echosounders after 1930-1940). Quality controls and qualification, conducted by the Shom, on these datasets are not exhaustive. Datasets may present significant uncertainties and errors may remain.

Datasets with homogeneous quality (the meaning of IHO) composed of datasets done by Shom.