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 002_2_26_8 Date de création : 1932 Support de l'original: Dimensions : 790mm x 1126mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 002_2_26_9 Date de création : 1932 Support de l'original: Dimensions : 790mm x 1130mm

Image numérique scannée non géoréférencée de la Bathymétrie 2005_11_01 Date de création : 2003-2004 Support de l'original: Film polyester Dimensions : 810mm x 848mm Description : SMF 10-1,, rapport particulier n° 23 MHA/NP du 12/01/2005.

Image numérique scannée non géoréférencée de la Bathymétrie et nature de fond 2002_48_01 Date de création : 2000-2001 Support de l'original: Film polyester Dimensions : 1280mm x 795mm Description : SMFN 10-1, rapport particulier n° 133 MHA/NP du 30/05/2002,

Image numérique scannée non géoréférencée de la Dessin de topographie 300_10_1519 Date de création : 1969 Support de l'original: Dimensions : 900mm x 757mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 013_2_275 Date de création : 1892 Support de l'original: Dimensions : 1100mm x 707mm