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 Traster 1995_45_05 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1098mm x 770mm Description : p 95_10_9-5, rapport descriptif n° 1146 EPSHOM/CH/GG/NP du 2/09/1995.

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 2000_48_16 Date de création : 1995-1998 Support de l'original: Film polyester Dimensions : 1150mm x 754mm Description : R 10-4, rapport particulier n° 52 MOP/UHNC/NP du 19/02/1999.

Image numérique scannée non géoréférencée de la Planicomp 1999_13_03 Date de création : 1999 Support de l'original: Film polyester Dimensions : 1097mm x 850mm Description : P 99_10_1-3, rapport descriptif n° 249 EPSHOM/CH/GG/NP du 26/04/1999

Image numérique scannée non géoréférencée de la 3285 Date d'édition : 1898 Date de publication : 1874 Support de l'original: papier Dimensions : 430mm x 271mm Description : Levé en 1869 par M. E. Mouchez, capitaine de vaisseau, commandant le Travailleur, assisté de M.M. Turquet, Charnoz, Boistel, Vincent, Bonnaffé et Sellier, officiers de ce bâtiment.

Image numérique scannée non géoréférencée de la Ecriture de sondes 035_C_0429 Date de création : 1950 Support de l'original: Dimensions : 1150mm x 764mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 013_2_266 Date de création : 1892 Support de l'original: Dimensions : 1100mm x 705mm

Image numérique scannée non géoréférencée de la Planicomp 1999_13_02 Date de création : 1999 Support de l'original: Film polyester Dimensions : 1098mm x 850mm Description : P 99_10_1-2, rapport descriptif n° 249 EPSHOM/CH/GG/NP du 26/04/1999