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 Traster 1995_58_01 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1095mm x 770mm Description : P 95_10_12-1, rapport descriptif n° 1441 EPSHOM/CH/GG/NP du 08/12/1995.

Image numérique scannée non géoréférencée de la Bathymétrie 2001_43_05 Date de création : 1996-1998 Support de l'original: Film polyester Dimensions : 1150mm x 753mm Description : B 10-71, rapport particulier n° 426 MOP/UHNC du 17/12/1998.

Image numérique scannée non géoréférencée de la Ecriture de sondes 035_P_1597 Date de création : 1963 Support de l'original: Dimensions : 1200mm x 761mm

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 2000_48_14 Date de création : 1995-1998 Support de l'original: Film polyester Dimensions : 1150mm x 753mm Description : R 10-2, rapport particulier n° 52 MOP/UHNC/NP du 19/02/1999.

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 2001_45_14 Date de création : 1996-1999 Support de l'original: Film polyester Dimensions : 1150mm x 751mm Description : R 10-45, rapport particulier n° 270 MOP/UHNC/NP du 01/09/1999. (Complète minutes 91_56_13 et 91_56_34

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 2000_48_17 Date de création : 1995-1998 Support de l'original: Film polyester Dimensions : 1150mm x 751mm Description : R 10-5, rapport particulier n° 52 MOP/UHNC/NP du 19/02/1999.

Image numérique scannée non géoréférencée de la Bathymétrie 1996_08_02 Date de création : 1994-1995 Support de l'original: Film polyester Dimensions : 1055mm x 740mm Description : B 10-64, rapport particulier n° 326 MOP/NOU/NP du 07/11/1995.