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 Ecriture de sondes 016_1_55 Date de création : 1898 Support de l'original: Dimensions : 1145mm x 870mm

Image numérique scannée non géoréférencée de la Bathymétrie 2002_26_02 Date de création : 2000 Support de l'original: Film polyester Dimensions : 1250mm x 831mm Description : SMF 10-8, rapport particulier n° 010 MHA/NP du 09/01/2002.

Image numérique scannée non géoréférencée de la Ecriture de sondes 016_2_36 Date de création : 1898 Support de l'original: Dimensions : 790mm x 623mm

Image numérique scannée non géoréférencée de la Imagerie SMF et nature de fond 2006_01_12 Date de création : 2005 Support de l'original: Film polyester Dimensions : 700mm x 883mm Description : Ima 10-6, rapport particulier n° 002 MHA/NP du 05/01/2006.

Image numérique scannée non géoréférencée de la Bathymétrie 300_10_1534 Date de création : 1969 Support de l'original: Dimensions : 760mm x 827mm

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 1997_18_17 Date de création : 1993 Support de l'original: Film polyester Dimensions : 1200mm x 754mm Description : R 10-5, rapport particulier n° 232 MHA/NP du 31/08/1994.

Image numérique scannée non géoréférencée de la Dessin de topographie 300_10_1396 Date de création : 1968 Support de l'original: Dimensions : 765mm x 1050mm