Distribution of dunes over the French continental shelf

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.

Citation proposal
Shom (2013) . Distribution of dunes over the French continental shelf. https://services.data.shom.fr:/geonetwork/WS/api/records/HOM_GEOL_DUNES_V1_1.xml

Simple

Date ( Publication ): 2013-11-20

Edition: V1.1

Identifier: http://www.shom.fr/HOM/GEOL_DUNES_V1_1

Author

Shom

13 rue du Chatellier

BREST

29200

France

Maintenance and update frequency: As needed

Maintenance note: Les nouvelles acquisitions à la mer et les levés des autres régions seront intégrés progressivement dans le cadre des mises à jours annuelles.

Keywords ( Theme )

geology
dunes

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geology

Use limitation: Fees apply to user rights for this data. A specific contract must be signed for the commercial re-use of data.

Use limitation: Do not use for navigation

Use limitation: Fees apply to user rights for this data. A specific contract must be signed for the commercial re-use of data.

Access constraints: Restricted

Use constraints: Restricted

Access constraints: Other restrictions

Other constraints: Fees apply to user rights for this data. A specific contract must be signed for the commercial re-use of data. https://diffusion.shom.fr/pro/ressources/courants-de-maree.html

Classification: Unclassified

Spatial representation type: Vector

Denominator: 10000

Metadata language: fre French

Character set: utf8 UTF8

Topic category

Oceans

Supplemental Information: SEach dune is identified by: - DuneCodes: a dune identification number (e.g. 20050020054), consisting of the date of the survey (the first four figures), the survey reference for the year (the next 3 figures), the dune number (the next 4 figures); - Source: reference code linking to the source data - DUNE_clas: dune classification by depth based on the following classes: 0-5 m, 5-10 m, 10-15 m, 15-20 m, 20-25 m, 25-30 m; - DUNE_dir: the direction indicates the direction of travel of the dune. Values are shown moving anti-clockwise (ArcGIS codes). E.g. DUNE_dir = 270 means that the dune is moving east). The value -1 means that no measurement is available for this parameter; - DUNE_WL: WL is the wavelength for the dune, i.e. its width (maximum distance between the dune bases) at its peak, or the distance between two peaks for dune fields. This information is not available in this initial version; - DUNE-date: date of the bathymetric survey for the dune, or the last survey date by default; - SysAcquis: name of the acquisition system used; - DUNE_H: Depth of the dune at its peak in metres. This parameter is equal to the difference between the depth of the highest point and the depth of the base of the short limb of the dune. The value -1 means that no measurement is available for this parameter.

Distribution format

Shape
(
inapplicable
)
GML
(
3.2
)

Point of contact

Shom

OnLine resource

Shom Geoportal

OnLine resource: GE.GeomorphologicFeature.Natural.SubMarineDunes
Access Point

OnLine resource: DUNES_BDD_4326_WMSV
Access Point - WMS

Hierarchy level: Dataset

Conformance result

Date ( Publication ): 2010-11-23

Explanation: Information sur la conformité au règlement d'interopérabilité des séries et des services de données géographiques.

Pass: true

Conformance result

Date ( Publication ): 2013-02-04

Explanation: Information sur la conformité de la ressource à une spécification.

Pass: true

Statement: The product was prepared by processing the side sonar data and MultiBeam EchoSounder (MBES) data listed, converted and integrated in the Dunes GIS between 2006 and 2013. If several surveys are completed in the same zone, the most recent dune location is shown. The product is based on shape files: Dunes_Data_Shom_19112013, validated on 20/11/2013.