Coastal topo-bathymetric DEM for the Pertuis of Charente(HOMONIM project)

The update of the coastal topo-bathymetric DEM of the Pertuis charentais at a resolution of 0.0002° (~ 20 m) was carried out in the third phase of the HOMONIM project.

The DEM extends from the terrestrial domain to about 60 meters depth over all the pertuis (pertuis Breton, pertuis d’Antioche and pertuis of Maumusson).

The DEM is intended to be implemented in hydrodynamic models in order to produce forecasts as accurate as possible of water heights and sea states at the coast to improve the relevance of the Wave-Submergence Vigilance.

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

Citation proposal
Shom. Coastal topo-bathymetric DEM for the Pertuis of Charente(HOMONIM project). https://services.data.shom.fr:/geonetwork/srv/api/records/MNT_COTIER_PERTUIS_HOMONIM_20m_WGS84.xml

Simple

Date ( Revision ): 2022-06-13

Edition: Edition 2.0

Identifier: http://www.shom.fr/BATHYMETRIE/MNT_COTIER_PERTUIS_HOMONIM_20m_WGS84

Presentation form: Digital map

Credit: ©Shom

Status: On going

Author

Shom

Maintenance and update frequency: Not planned

GEMET - INSPIRE themes, version 1.0 ( Theme )

Altitude

Keywords ( Theme )

Bathymetry
Digital Elevation Model
Open data
Product

Keywords ( Place )

Pertuis Charentais
Golfe de Gascogne

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,2022. MNT topo-bathymétrique côtier des Pertuis Charentais (HOMONIM project). http://dx.doi.org/10.17183/MNT_COTIER_PERTUIS_HOMONIM_20m_WGS84."

Use limitation: Do not use for navigation

Use limitation: Data may be freely used providing that the source is mentioned as follows : "Shom,2022. MNT topo-bathymétrique côtier des Pertuis Charentais (HOMONIM project). http://dx.doi.org/10.17183/MNT_COTIER_PERTUIS_HOMONIM_20m_WGS84."

Use limitation: Do not use for navigation

Access constraints: License

Use constraints: Other restrictions

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

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: -58

Maximum value: 62

Vertical CS

No information provided.

Vertical datum

No information provided.

Vertical extent

Minimum value: -61

Maximum value: 59

Vertical CS

No information provided.

Vertical datum

No information provided.

Number of dimensions: 2

Dimension name: Row

Dimension size: 3501

Resolution: 0.0002 dd

Dimension name: Column

Dimension size: 3751

Resolution: 0.0002 dd

Cell geometry: Area

Transformation parameter availability: false

Distribution format

ArcGis Grid
(
inapplicable
)
BAG
(
inapplicable
)
GLZ
(
inapplicable
)
GRD
(
inapplicable
)

Distributor

Shom

OnLine resource

Shom geoportal

OnLine resource: MNT_COTIER_PERTUIS_HOMONIM_20m_PBMA_4326_WMSR
Access point / WMS DEM LAT

OnLine resource: Download service LAT

OnLine resource: Download service MSL

OnLine resource

Shom distribution space

Shom distribution space to download DEMs

Hierarchy level: Dataset

Conformance result

Date ( Publication ): 2013-12-10

Explanation: Information on compliance with INSPIRE specifications for the Altitude theme.

Pass: true

Conformance result

Date ( Publication ): 2010-11-23

Explanation: Information on compliance with the Geographic Data Sets and Services Interoperability Regulation.

Pass: true

Statement

In addition to the Shom data, the surveys of external organizations were exploited. Those contributors are the following :

Délégation à la Mer et au Littoral de la Vendée

DDTM de Charente-Maritime

Grand Port Maritime de Bordeaux

Grand Port Maritime de La Rochelle

IGN (RGEALTI® V2.0)

Laboratoire Central d'Hydraulique de France

Description

The main production tasks of this product line are based on 4 major axes each aiming at reducing the DTM uncertainties:

1) the collection, evaluation, pre-processing, and selection of data from multiple sources whose acquisition is from different sensors and time periods;

2) homogenization of the vertical and horizontal reference of the data sets;

3) the use of interpolation algorithms adapted to the heterogeneous distribution and variable density of the data, and

4) the evaluation and qualification of the final product and the elaboration of its documentation