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 Sondes écrites 006_11_18 Date de création : 1889 Support de l'original: Dimensions : 1060mm x 720mm

Image numérique scannée non géoréférencée de la Topographie 005_6_10 Date de création : 1963 Support de l'original: Dimensions : 753mm x 535mm

Image numérique scannée non géoréférencée de la Définitive 006_11_30 Date de création : 1888 Support de l'original: Dimensions : 729mm x 1084mm

Image numérique scannée non géoréférencée de la Dessin de topographie 014_5_10 Date de création : 1957 Support de l'original: Dimensions : 1057mm x 751mm

Image numérique scannée non géoréférencée de la Construction topographie (dessin topo) 003_2_13_2 Date de création : 1929 Support de l'original: Dimensions : 1060mm x 762mm

Image numérique scannée non géoréférencée de la Ecritures de sondes 003_1_55_03 Date de création : 1934 Support de l'original: Dimensions : 762mm x 1062mm

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