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 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 Bathymétrie 2001_43_02 Date de création : 1996-1998 Support de l'original: Film polyester Dimensions : 1150mm x 752mm Description : B 10-68, rapport particulier n° 426 MOP/UHNC du 17/12/1998.

Image numérique scannée non géoréférencée de la Ecritures de sondes 012_2_083 Date de création : 1901 Support de l'original: Dimensions : 755mm x 1081mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 004_4_13_15 Date de création : 1937 Support de l'original: Dimensions : 1058mm x 765mm

Image numérique scannée non géoréférencée de la Ecriture de sondes et dessin topographique 005_3_46 Date de création : 1946 Support de l'original: Dimensions : 758mm x 1005mm

Image numérique scannée non géoréférencée de la Ecriture de sondes 014_5_11 Date de création : 1957 Support de l'original: Dimensions : 1052mm x 756mm

Image numérique scannée non géoréférencée de la Topographie 006_11_29 Date de création : 1889 Support de l'original: Dimensions : 1073mm x 717mm