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 Ecritures de sondes 004_4_13_01 Date de création : 1937 Support de l'original: Dimensions : 1061mm x 759mm

Image numérique scannée non géoréférencée de la Traster 1995_45_03 Date de création : 1995 Support de l'original: Film polyester Dimensions : 1096mm x 770mm Description : p 95_10_9-3, rapport descriptif n° 1146 EPSHOM/CH/GG/NP du 2/09/1995.

Image numérique scannée non géoréférencée de la Traster 1993_21_30 Date de création : 1991 Support de l'original: Film polyester Dimensions : 1100mm x 753mm Description : P 91_10_8-7, rapport descriptif n° 909 EPSHOM/HY/GG/NP du 24/10/91.

Image numérique scannée non géoréférencée de la Topographie 1974_13_20 Date de création : 1974 Support de l'original: Dimensions : 1055mm x 767mm

Image numérique scannée non géoréférencée de la Bathymétrie 2004_19_03 Date de création : 2003 Support de l'original: Film polyester Dimensions : 1280mm x 843mm Description : SMFN 10-3, rapport particulier n° 20 MHA/NP du 13/01/2004

Image numérique scannée non géoréférencée de la Bathymétrie 1994_29_06 Date de création : 1991-1993 Support de l'original: Film polyester Dimensions : 754mm x 1100mm Description : B 10-8, rapport particulier n° 109 MHA/NP du 14/04/94, lettre n° 460 EPSHOM/CH/GG/NP du 05/11/03

Image numérique scannée non géoréférencée de la Bathymétrie 1992_67_022 Date de création : 1990-1991 Support de l'original: Film polyester Dimensions : 1100mm x 755mm Description : B 10-4, minute bathymétrie