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.

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_41_01 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1091mm x 770mm Description : P 95_10_8-1, rapport descriptif n° 1035 EPSHOM/CH/GG/NP du 01/09/1995.

Image numérique scannée non géoréférencée de la Définitive 017_2_39 Date de création : 1897 Support de l'original: Dimensions : 440mm x 442mm

Image numérique scannée non géoréférencée de la Bathymétrie 2001_45_08 Date de création : 1996-1999 Support de l'original: Film polyester Dimensions : 1150mm x 754mm Description : B 10-50, rapport particulier n° 270 MOP/UHNC/NP du 01/09/1999. (Complète minutes 91_56_15 et 93_61_01)

Image numérique scannée non géoréférencée de la Bathymétrie 1996_59_01 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1043mm x 744mm Description : SMF 10-1, rapport particulier n° 154 MHA/NP du 19/07/1996.

Image numérique scannée non géoréférencée de la Dessin de topographie 014_5_10 Date de création : 1957 Support de l'original: Dimensions : 1057mm x 751mm

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 Dessin de topographie 012_4_081 Date de création : 1967 Support de l'original: Dimensions : 900mm x 1126mm