Coastal topo-bathymetric DEM for the Morbihan (TANDEM project)

The coastal topo- bathymetric DEM for the coasts of Morbihan with a resolution of 0.0002° (~ 20 m) was prepared as part of the TANDEM project (Programme Investissements d'Avenir, ANR-11-RSNR-00023-01).

It covers the French administrative department of Morbihan and part of Loire-Atlantique. This DEM runs from the Gâvres peninsula in the north west to La Baule in the south east and covers the Gulf of Morbihan, the Quiberon bay and peninsula, Houat, Hoëdic and Belle-Ile islands and the Vilaine estuary.

The DEM is designed to be implemented in the hydrodynamic models of the TANDEM project in order to estimate the coastal effects of tsunamis for the Atlantic and English Channel, where French nuclear power plants have been installed for about 30 years.

This product is available with the Lowest Astronomic Tide (LAT) or the Mean Sea Level (MSL) as a vertical datum.

Citation proposal
. Coastal topo-bathymetric DEM for the Morbihan (TANDEM project). https://services.data.shom.fr:/geonetwork/WS/api/records/MNT_COTIER_MORBIHAN_TANDEM_20m_WGS84.xml

Simple

Date ( Creation ): 2015-10-19T00:00:00

Identifier: http://www.shom.fr/BATHYMETRIE/MNT_COTIER_MORBIHAN_TANDEM_20m_WGS84

Presentation form: Digital map

Credit: ©Shom

Status: On going

Owner

Shom

13 rue du Chatellier

Brest

29200

France

Maintenance and update frequency: Not planned

GEMET - INSPIRE themes, version 1.0 ( Theme )

Elevation

Keywords ( Theme )

topography
bathymetry
digital elevation model
Product
open data

Keywords ( Place )

Golfe de Gascogne
Atlantique

Keywords ( Discipline )

Geophysic

High-value dataset categories

Observation de la terre et environnement

Use limitation: Data may be freely used providing that the source is mentioned as follows "Shom,2015.MNT topo-bathymétrique côtier de la zone "Morbihan" à 20m (Projet TANDEM). http://dx.doi.org/10.17183/MNT_COTIER_MORBIHAN_TANDEM_20m_WGS84"

Use limitation: Data may not be modified or distributed without the agreement of the distributor.

Use limitation: Do not use for navigation

Use limitation: The product is distributed under an Opendata license (version 2.0, April 2017), defined by the Etalab mission.

Use limitation: Data may not be modified or distributed without the agreement of the distributor.

Access constraints: Other restrictions

Use constraints: License

Other constraints: Data may be freely used providing that the source is mentioned as follows "Shom,2015.MNT topo-bathymétrique côtier de la zone "Morbihan" à 20m (Projet TANDEM). http://dx.doi.org/10.17183/MNT_COTIER_MORBIHAN_TANDEM_20m_WGS84"

Access constraints: Other restrictions

Other constraints: Pas de restriction d'accès public. No public access restrictions.

Classification: Unclassified

Spatial representation type: Grid

Distance: 0.0002 dd

Metadata language: fre French

Character set: utf8 UTF8

Topic category

Elevation

Vertical extent

Minimum value: -81.92

Maximum value: 90.16

Vertical CS

No information provided.

Vertical datum

No information provided.

Vertical extent

Minimum value: -79.09

Maximum value: 93.52

Vertical CS

No information provided.

Vertical datum

No information provided.

Reference system identifier

EPSG

WGS 84 (EPSG:4326)

7.9

Number of dimensions: 2

Dimension name: Row

Dimension size: 2626

Resolution: 0.0002 dd

Dimension name: Column

Dimension size: 4834

Resolution: 0.0002 dd

Cell geometry: Area

Transformation parameter availability: false

Distribution format

ArcGis Grid
(
-
)
BAG
(
-
)
GLZ
(
-
)
GRD
(
-
)

Distributor

Shom

OnLine resource: Shom geoportal

OnLine resource

MNT_COTIER_MORBIHAN_TANDEM_20m_PBMA_3857_WMSR

Bathymetric DEM Morbihan raster WMS

OnLine resource: Download service LAT

OnLine resource: Download service MSL

OnLine resource: Shom distribution space

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 ): 2013-12-10

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

Pass: true

Statement: In addition to the Shom data, the surveys of external organisms have been exploited, the contributors of which are as follows: IGN, DDE Morbihan, Institution d'Aménagement de la Vilaine, Port Atlantique-Nantes-Saint-Nazaire, Syndicat Mixte de la Ria d'Etel.

Description

The main tasks involved in producing this range of solutions are based on 4 key aspects, each intended to reduce uncertainty for the DEM:

1) collecting, evaluating, pre-processing and selecting data from multiple sources after acquisition using survey systems from various eras;

2) homogenising the vertical and horizontal datums for data sets;

3) using interpolation algorithms suitable for a heterogeneous distribution and the variable density of data, and

4) evaluating and qualifying the final product and preparing documentation.