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 Topographie 031_681 Date de création : 1950 Support de l'original: Dimensions : 1126mm x 761mm

Image numérique scannée non géoréférencée de la Bathymétrie 2007_043_02 Date de création : 2007 Support de l'original: Film polyester Dimensions : 1250mm x 866mm Description : SMF 10-2, rapport particulier n° 20 SHOM/GHA/NP du 04/09/2007.

Image numérique scannée non géoréférencée de la Traster Topo 1991_21_06 Date de création : 1991 Support de l'original: Film polyester Dimensions : 770mm x 1046mm Description : P 91_10_3-6, rapport descriptif n° 519 EPSHOM/CH/GG/NP du 04/06/1991, voir aussi minute 1999_33_13

Image numérique scannée non géoréférencée de la Bathymétrie 300_10_1533 Date de création : 1969 Support de l'original: Dimensions : 760mm x 824mm

Image numérique scannée non géoréférencée de la Bathymétrie 1981_20_02 Date de création : 1981 Support de l'original: Dimensions : 1155mm x 765mm

Image numérique scannée non géoréférencée de la Traster 1992_72_36 Date de création : 1989 Support de l'original: Film polyester Dimensions : 1100mm x 755mm Description : P 89_10_5-36, rapport n° 413 EPSHOM/E/GG/NP du 26/06/89; rapport particulier n° 96 MOP MOP/NOU/NP du 15/05/92

Image numérique scannée non géoréférencée de la Bathymétrie Sonal 1985_04_03 Date de création : 1985 Support de l'original: Dimensions : 790mm x 1126mm