• Metadata catalogue
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Topographic DEM - Littoral pebble spit - Baie de Somme

DATA :

Topographic DEMs obtained from a LIDAR system or a terrestrial laser scanner (TLS).

(1) LIDAR data :

Topographic DEM with a 1-m resolution and accuracy below 10 cm RMS in altimetry acquired by an airborne scanner (Leica ALS60).

(2) TLS data :

Topographic DEMs with a 10-cm resolution and an accuracy comprised between the mm and some cm (depending on the survey conditions). The DEM is derived from a point cloud obtained with a terrestrial laser scanner (Leica ScanStation C10).

AREA :

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.

 
Citation proposal
Sophie Le Bot (University of Rouen, UMR CNRS 6143 M2C) (2019) . Topographic DEM - Littoral pebble spit - Baie de Somme. SNO DYNALIT https://services.mspdata.eu:/geonetwork/srv/api/records/f75030db-31a7-477e-9430-65e8d929d335

Simple

Date ( Creation )
2019-05-29
Date ( Publication )
2019-05-29
Identifier
DOI:10.12770/f75030db-31a7-477e-9430-65e8d929d335
Credit
UMR 6143 M2C

  Author

University of Rouen, UMR CNRS 6143 M2C - Sophie Le Bot  
Pl. Emile Blondel, Bâtiment Blondel Nord Mont Saint Aignan 76821 France

  Publisher

SNO DYNALIT  
France

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
N
S
E
W


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

Absolute external positional accuracy

Conformance result

Date ( Creation )
2012-01-16
Explanation
Not assessed
Pass
false
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

  Point of contact

SNO DYNALIT - National Observation Service focuses on the dynamic study of the coastline and the coastline  
France

  Point of contact

University of Rouen, UMR CNRS 6143 M2C - Sophie Le Bot  
Pl. Emile Blondel, Bâtiment Blondel Nord Mont Saint Aignan 76821 France

 
 

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