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 1997_14_06 Date de création : 1993-1996 Support de l'original: Film polyester Dimensions : 1054mm x 752mm Description : B 10-6, rapport particulier n° 177 MHA/NP du 27/08/1996.

Image numérique scannée non géoréférencée de la Ecritures sondes 006_09_09_2 Date de création : 1936 Support de l'original: Dimensions : 1057mm x 757mm

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

Image numérique scannée non géoréférencée de la Traster Bathy 1992_65_02 Date de création : 1992 Support de l'original: Film polyester Dimensions : 755mm x 1100mm Description : Minute P 92_10_17-2, tracé d' isobathes, rapport descriptif n° 1352 EPSHOM/CH/GG/NP du 15/12/92

Image numérique scannée non géoréférencée de la Ecriture de sondes 036_J_1043 Date de création : 1961 Support de l'original: Dimensions : 1180mm x 762mm

Image numérique scannée non géoréférencée de la Ecriture de sondes 300_10_1251 Date de création : 1966 Support de l'original: Dimensions : 800mm x 1125mm

Image numérique scannée non géoréférencée de la Définitive 035_G_0627 Date de création : 1952 Support de l'original: Dimensions : 1300mm x 890mm