Date ( Creation )

2019-05-29

Date ( Publication )

2019-05-29

Identifier

DOI:10.12770/f75030db-31a7-477e-9430-65e8d929d335

Credit

UMR 6143 M2C

Keywords ( Theme )

• SNO DYNALIT

  ,

  Topography

  ,

  TLS

  ,

  DTM

Keywords ( Place )

• France

  ,

  Hauts-de-France

  ,

  Somme

  ,

  Cayeux-sur-Mer

  ,

  Baie de Somme

Thèmes Sextant Thèmes Sextant ( Theme )

• /Physical Environment/Bathymetry/Digital Terrain Model

GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 ( Theme )

• Elevation

Thématiques - SIMM Thématiques - SIMM ( Theme )

• ,

Sous-regions marines Sous-regions marines ( Place )

• Channel-North Sea

Type de jeux de donnée ODATIS Type de jeux de donnée ODATIS ( Theme )

• Données d'observation

Infrastructures de recherche Infrastructures de recherche ( Theme )

• IR-ILICO

Services Nationaux d'Observation Services Nationaux d'Observation ( Theme )

• SNO-Dynalit

ODATIS aggregation parameters and Essential Variable names ODATIS aggregation parameters and Essential Variable names ( Theme )

• Trait de côte

Use limitation

Données sous Licence ouverte / Open licence : http://www.etalab.gouv.fr/pages/licence-ouverte-open-licence-5899923.html

Access constraints

Other restrictions

Use constraints

License

Other constraints

if there is DOI (Digital Object Identifier), respect the citation indicated in the Landing Page of the DOI (link specified in the metadata sheet).

Spatial representation type

grid Grid

Distance

1  meter

Metadata language

English

Character set

utf8 UTF8

Topic category

• Geoscientific information
• Oceans
• Elevation

Reference system identifier

EPSG

/

Lambert 93 (EPSG:2154)

/

7.4

Number of dimensions

0

Cell geometry

Area

Transformation parameter availability

false

Distribution format

• GeoTIFF

  (

  1.0

  )

OnLine resource

SNO DYNALIT  

OnLine resource

DOI of the dataset  

DOI of the dataset

OnLine resource

MNT_BaieDeSomme_2011-auj.  

DEM - Baie de Somme - 2011-now (WMS-T)

OnLine resource

MNT-Topo_BaieDeSomme_20190326  

MNT (TLS) - Baie de Somme - 26/03/2019

OnLine resource

MNT-Topo_BaiedeSomme_20190301  

MNT - Baie-de-Somme - 01/03/2019 (CSV)

OnLine resource

MNT-Topo_BaieDeSomme_20170407  

MNT (TLS) - Baie de Somme - 07/04/2017

OnLine resource

MNT-Topo_BaieDeSomme_20161216  

MNT (Lidar topographique) - Baie de Somme - 16/12/2016 (File)

OnLine resource

MNT-Topo_BaieDeSomme_20150615  

MNT (Lidar topographique) - Baie de Somme - 15/06/2015

OnLine resource

MNT-Topo_BaieDeSomme_20131104  

MNT (Lidar topographique) - Baie de Somme - 04/11/2013

OnLine resource

MNT-Topo_BaieDeSomme_20130401  

MNT (Lidar topographique) - Baie de Somme - 01/04/2013

OnLine resource

MNT-Topo_BaieDeSomme_20121118  

MNT (Lidar topographique) - Baie de Somme - 18/11/2012

OnLine resource

MNT-Topo_BaieDeSomme_20120602  

MNT (Lidar topographique) - Baie de Somme - 02/06/2012

OnLine resource

MNT-Topo_BaieDeSomme_20110928  

MNT (Lidar topographique) - Baie de Somme - 28/09/2011

Hierarchy level

Dataset

Statement

Topographic DEM - Littoral pebble spit - Baie de Somme

AREA:

The DEM concerns a portion of the littoral pebble spit of the Baie de Somme, in the sector of La Mollière (Cayeux-sur-Mer), including the upper part of the sandy intertidal zone and the active barrier spit, over 200 m in the cross-shore direction and 1200 m in the longshore direction

RESOLUTION and ACCURACY:

(1) LIDAR:

Resolution : 1 m

Altrimetric Accuracy : under 10 cm RMS

(2) TLS:

Resolution of the DEM is 10-cm and precision is between the mm and some cm (depending on the survey conditions).

DATA ACQUISITION :

(1) LIDAR:

The DEM is derived from an airborne topographic LiDAR, Leica ALS60. Terrasolid software is used to generate a proper georeferenced point cloud using ground DEMs acquired by DGPS. The bare ground is then classified by automatic and manual extraction. The points are then averaged to create a DEM. The planimetric system used is Lambert 93 and the altimetric measurements are expressed in the IGN -69 system. For the full complex process details, see M2C laboratory.

Data acquisition and processing by Laurent Froideval

(2) TLS:

The DEM is derived from a point cloud obtained with a terrestrial laser scanner (Leica ScanStation C10, © Leica Geosystems). Several scanning positions are operated for each survey. The original data were acquired with a variable resolution, fixed at 10 cm at 100 m from the scanning positions. The data are processed using the Leica Cyclone software (© Leica Geosystems) for scanning points assembling and georeferencing. A manual clean-up of the data is necessary, in particular for the vegetation ; most of the vegetation has been removed when the vegetation density is low and allow to identify individuals. Georeferencing of the topographic data is realised using a DGPS (Leica Viva GS15, © Leica Geosystems). DGPS data are acquired during 1 to 2h at 2 different places during each survey, and are then postprocessed using Leica Geo Office software (© Leica Geosystems). Position is given in the projection Lambert 93 associated to the geodetic system RGF93. The position precision is between the mm and some cm depending on the survey conditions. These 2 places are specifically scanned with a very high resolution (scan windows), and then spotted in the point cloud. Their positions are filled in the Cyclone software (© Leica Geosystems), which calculates then the position of all the points in the cloud in the Lambert 93 projection.

The topographic data are then integrated in the ArcGIS software (© ESRI). Point data are converted into a raster with a 10-cm resolution (mean of the topographic information per 10-cm mesh), then converted into a point layer to be interpolated using kriging (Geostatistical Analyst Tool used with optimized model and parameters).

Data acquisition and processing by Sophie Le Bot

Metadata

File identifier

f75030db-31a7-477e-9430-65e8d929d335   XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

Série de données

Date stamp

2025-05-16T09:37:00.78133Z

Metadata standard name

ISO 19115-3 - SEXTANT ISO 19115-3 - SEXTANT

Metadata standard version

1.0