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.

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.

Image numérique scannée non géoréférencée de la Bathymétrie 1996_59_08 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1045mm x 747mm Description : SMFN 10-8, rapport particulier n° 154 MHA/NP du 19/07/1996.

Image numérique scannée non géoréférencée de la Bathymétrie 1993_20_09 Date de création : 1990 Support de l'original: Film polyester Dimensions : 1100mm x 753mm Description : B 10-9, rapport particulier n° 131 MHA/NP du 11/04/91.

Image numérique scannée non géoréférencée de la Topographie 1991_07_04 Date de création : 1988 Support de l'original: Film polyester Dimensions : 752mm x 1100mm Description : T 10, rapport particulier n° 131 MOP/PPT du 19/07/1989.

Image numérique scannée non géoréférencée de la Bathymétrie 300_10_1535 Date de création : 1969 Support de l'original: Dimensions : 780mm x 828mm

Image numérique scannée non géoréférencée de la Bathymétrie 1986_29_019 Date de création : 1986 Support de l'original: Dimensions : 850mm x 1120mm

Image numérique scannée non géoréférencée de la Bathymétrie 1986_09_012 Date de création : 1986 Support de l'original: Dimensions : 850mm x 1163mm

Image numérique scannée non géoréférencée de la Bathymétrie 1986_09_015 Date de création : 1986 Support de l'original: Dimensions : 850mm x 1121mm