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 002_2_26_9 Date de création : 1932 Support de l'original: Dimensions : 790mm x 1130mm

Image numérique scannée non géoréférencée de la Définitive 016_2_39 Date de création : 1898 Support de l'original: Dimensions : 830mm x 1083mm

Image numérique scannée non géoréférencée de la Ecriture de sondes 010_4_198 Date de création : 1962 Support de l'original: Dimensions : 700mm x 761mm

Image numérique scannée non géoréférencée de la Planicomp 1998_05_05 Date de création : 1998 Support de l'original: Film polyester Dimensions : 850mm x 1093mm Description : P 98_10_1-5, rapport descriptif n° 43 EPSHOM/CH/GG/NP du 11/02/1998.

Image numérique scannée non géoréférencée de la Bathymétrie 2001_20_06 Date de création : 1999 Support de l'original: Film polyester Dimensions : 1200mm x 769mm Description : SMF 10-16, rapport particulier n° 249 MHA/NP du 15/05/2000.

Image numérique scannée non géoréférencée de la Minute 1989_11_01 Date de création : 1989 Support de l'original: Film polyester Dimensions : 775mm x 1100mm Description : Minute photogrammétrie P89_10_9

Image numérique scannée non géoréférencée de la 1977_20_21 Date de création : 1977 Support de l'original: Dimensions : 1200mm x 759mm