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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.
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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.
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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.
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Image numérique scannée non géoréférencée de la Planicomp 1998_05_11 Date de création : 1998 Support de l'original: Film polyester Dimensions : 850mm x 1093mm Description : P 98_10_1-11, rapport descriptif n° 43 EPSHOM/CH/GG/NP du 11/02/1998.
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Image numérique scannée non géoréférencée de la Dessin de topographie 300_10_1529 Date de création : 1969 Support de l'original: Dimensions : 760mm x 827mm
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Image numérique scannée non géoréférencée de la Dessin de topographie 300_10_1396 Date de création : 1968 Support de l'original: Dimensions : 765mm x 1050mm
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Image numérique scannée non géoréférencée de la Topographie 1977_15_08 Date de création : 1977 Support de l'original: Dimensions : 780mm x 1125mm
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Image numérique scannée non géoréférencée de la Topographie 1970_07_29 Date de création : 1970 Support de l'original: Dimensions : 800mm x 1124mm
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Image numérique scannée non géoréférencée de la Topographie 1977_15_05 Date de création : 1977 Support de l'original: Dimensions : 780mm x 1123mm
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Image numérique scannée non géoréférencée de la Ecriture de sondes 016_1_57 Date de création : 1898 Support de l'original: Dimensions : 1156mm x 870mm