The product "Distribution of the submarine dunes of the French continental shelf" contains digital vector data provided as 2D linear objects representing the crest of submarine dunes digitized from bathymetric surveys conducted by the Shom. When several surveys have been carried out on the same area or dune, the product contains the information from all the surveys. However, the data displayed on data.shom.fr is limited to the information from the most recent survey.

This product includes a map of the peaks of around 3,000 submarine dunes entered using bathymetric surveys by Shom. Each dune is marked out by a line showing its peak summit. Dune locations are precise to between 1 m (MBES data from the 2000-2010 period) and a dozen metres (data acquired prior to 2000 using a side sonar). The precision of the carrier location, the acquisition system and the MBES resolution (the distance between the systems acquired) also affect map precision. Submarine dunes can move at the rate of a few metres per year, but can also exceed 30 m/year. The precision of dune positions will therefore decrease with the age of the measurement.

The product "Distribution of the submarine dunes of the French continental shelf" contains digital vector data provided as 2D linear objects representing the crest of submarine dunes digitized from bathymetric surveys conducted by the Shom. When several surveys have been carried out on the same area or dune, the product contains the information from all the surveys. However, the data displayed on data.shom.fr is limited to the information from the most recent survey.

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Image numérique scannée non géoréférencée de la Bathymétrie Recherche 1991_29_11 Date de création : 1986-1989 Support de l'original: Film polyester Dimensions : 1091mm x 760mm Description : R 10-20, rapport particulier n° 123 MHA/NP du 29/03/1990.

Image numérique scannée non géoréférencée de la Ecritures de sondes 004_4_13_11 Date de création : 1937 Support de l'original: Dimensions : 661mm x 755mm

Image numérique scannée non géoréférencée de la Construction topographie (dessin topo) 003_2_13_1 Date de création : 1929 Support de l'original: Dimensions : 1061mm x 760mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 013_2_272 Date de création : 1892 Support de l'original: Dimensions : 750mm x 1080mm

Image numérique scannée non géoréférencée de la Dessin de topographie 012_4_079 Date de création : 1967 Support de l'original: Dimensions : 900mm x 1130mm

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