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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 2009_14_05 Date de création : 2009 Support de l'original: Dimensions : 1070mm x 730mm
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Image numérique scannée non géoréférencée de la Rédaction de recherches de roches 300_10_1485 Date de création : 1968 Support de l'original: Dimensions : 1180mm x 763mm
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Image numérique scannée non géoréférencée de la Définitive 036_B_0324_4 Date de création : 1948 Support de l'original: Dimensions : 1180mm x 755mm
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Image numérique scannée non géoréférencée de la Ecriture de sondes 036_H_0874 Date de création : 1960 Support de l'original: Dimensions : 800mm x 1123mm
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Image numérique scannée non géoréférencée de la Ecriture de sondes 036_J_1045 Date de création : 1961 Support de l'original: Dimensions : 1180mm x 766mm
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Image numérique scannée non géoréférencée de la Topographie 036_B_0327 Date de création : 1949 Support de l'original: Dimensions : 1180mm x 761mm
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Image numérique scannée non géoréférencée de la Bathymétrie 1977_10_24 Date de création : 1977 Support de l'original: Dimensions : 759mm x 1170mm