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 Recherches de roches (calques collés) 006_05_056_1_1 Date de création : 1921 Support de l'original: Dimensions : 920mm x 1264mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 013_2_271 Date de création : 1892 Support de l'original: Dimensions : 750mm x 1074mm

Image numérique scannée non géoréférencée de la Définitive 017_2_40 Date de création : 1897 Support de l'original: Dimensions : 370mm x 448mm

Image numérique scannée non géoréférencée de la Ecritures de Hauts-fonds 010_2_65 Date de création : 1928 Support de l'original: Dimensions : 1200mm x 761mm

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 1986_09_057 Date de création : 1986 Support de l'original: Dimensions : 1163mm x 850mm

Image numérique scannée non géoréférencée de la Bathymétrie Recherche 2000_48_14 Date de création : 1995-1998 Support de l'original: Film polyester Dimensions : 1150mm x 753mm Description : R 10-2, rapport particulier n° 52 MOP/UHNC/NP du 19/02/1999.

Image numérique scannée non géoréférencée de la Planicomp 1995_01_13 Date de création : 1994 Support de l'original: Calque Dimensions : 790mm x 1121mm Description : P 95_10_1-13, rapport descriptif n° 154 EPSHOM/CH/GG/NP du 31/01/1995.