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.

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.

Image numérique scannée non géoréférencée de la Bathymétrie et sonal 1995_38_02 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1100mm x 752mm Description : BS 10-2, rapport particulier n° 219 MOP/NOU/NP du 05/07/1995.

Image numérique scannée non géoréférencée de la Bathymétrie Recherches 1996_40_05 Date de création : 1996 Support de l'original: Film polyester Dimensions : 1050mm x 755mm Description : R 10-1, rapport particulier n° 129 MOP/NOU/NP du 19/04/1996.

Image numérique scannée non géoréférencée de la Bathymétrie 2001_45_03 Date de création : 1996-1999 Support de l'original: Film polyester Dimensions : 1150mm x 751mm Description : B 10-7, rapport particulier n° 270 MOP/UHNC/NP du 01/09/1999. (Complète minute 88_18_07)

Image numérique scannée non géoréférencée de la Bathymétrie 1998_54_03 Date de création : 1996 Support de l'original: Film polyester Dimensions : 860mm x 1093mm Description : B 10-2, rapport particulier n° 309 MOP/UHNC/NP du 17/11/1997, rapport particulier complémentaire n° 86 MOP/UHNC/NP du 26/03/1999.

Image numérique scannée non géoréférencée de la Bathymétrie Recherches 1996_40_06 Date de création : 1996 Support de l'original: Film polyester Dimensions : 1043mm x 751mm Description : R10-3, rapport particulier n° 129 MOP/NOU/NP du 19/04/1996.

Image numérique scannée non géoréférencée de la Topographie 1998_37_01 Date de création : 1998 Support de l'original: Film polyester Dimensions : 860mm x 1095mm Description : P 98_10_2-1, rapport descriptif n° 139 EPSHOM/CH/GG/NP du 29/05/1998.

Image numérique scannée non géoréférencée de la Photogramétrie 1999_12_24.1 Date de création : 1997 Support de l'original: Dimensions : 1095mm x 840mm