• Metadata catalogue
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Porsmilin bathymetric DEMs

Hydrographic surveys have been conducted using small boats of the Institut Universitaire Européen de la Mer (https://www.flotteoceanographique.fr/en/Facilities/Vessels-Deep-water-submersible-vehicles-and-Mobile-equipments/Station-vessels/Albert-Lucas), which can be equipped with a range of sensors for data acquisition in the nearshore zone. For each survey, we prepared a Digital Elevation Model (DEM) at a fixed sampling distance of 0.5 m.
 
Citation proposal
Bertin Stéphane Bertin Stéphane Bertin Stéphane (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Floc'h France Floc'h France Floc'h France (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Le Dantec Nicolas Le Dantec Nicolas Le Dantec Nicolas (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Jaud Marion Jaud Marion Jaud Marion (UMS 3113 UMS 3113 UMS 3113 ) - Cancouët Romain Cancouët Romain Cancouët Romain (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Franzetti Marcaurelio Franzetti Marcaurelio Franzetti Marcaurelio (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Cuq Véronique Cuq Véronique Cuq Véronique (UMR 6554 LETG UMR 6554 LETG UMR 6554 LETG ) - Prunier Christophe Prunier Christophe Prunier Christophe (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Ammann Jérôme Ammann Jérôme Ammann Jérôme (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Augereau Emmanuel Augereau Emmanuel Augereau Emmanuel (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Lamarche Stevenn Lamarche Stevenn Lamarche Stevenn (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Belleney Déborah Belleney Déborah Belleney Déborah (UMR 6554 LETG UMR 6554 LETG UMR 6554 LETG ) - Rouan Mathias Rouan Mathias Rouan Mathias (UMR 6554 LETG UMR 6554 LETG UMR 6554 LETG ) - David Laurence David Laurence David Laurence (UMR 6554 LETG UMR 6554 LETG UMR 6554 LETG ) - Deschamps Anne Deschamps Anne Deschamps Anne (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Delacourt Christophe Delacourt Christophe Delacourt Christophe (UMR 6538 LGO UMR 6538 LGO UMR 6538 LGO ) - Suanez Serge Suanez Serge Suanez Serge (UMR 6554 LETG UMR 6554 LETG UMR 6554 LETG ) (2021) . Porsmilin bathymetric DEMs. https://services.mspdata.eu:/geonetwork/srv/api/records/58ca9626-a0d3-410a-b775-51b29400f854

Simple

Date ( Publication )
2021-03-11
Identifier
https://portail.indigeo.fr/geonetwork/srv/metadata/58ca9626-a0d3-410a-b775-51b29400f854
Credit
UMR 6538 LGO - UMR 6554 LETG
Status
Completed

  Author

UMR 6538 LGO - Bertin Stéphane Bertin Stéphane Bertin Stéphane  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Floc'h France Floc'h France Floc'h France  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Le Dantec Nicolas Le Dantec Nicolas Le Dantec Nicolas  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMS 3113 - Jaud Marion Jaud Marion Jaud Marion  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Cancouët Romain Cancouët Romain Cancouët Romain  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Franzetti Marcaurelio Franzetti Marcaurelio Franzetti Marcaurelio  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6554 LETG - Cuq Véronique Cuq Véronique Cuq Véronique  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Prunier Christophe Prunier Christophe Prunier Christophe  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Ammann Jérôme Ammann Jérôme Ammann Jérôme  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Augereau Emmanuel Augereau Emmanuel Augereau Emmanuel  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Lamarche Stevenn Lamarche Stevenn Lamarche Stevenn  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6554 LETG - Belleney Déborah Belleney Déborah Belleney Déborah  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6554 LETG - Rouan Mathias Rouan Mathias Rouan Mathias  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6554 LETG - David Laurence David Laurence David Laurence  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Deschamps Anne Deschamps Anne Deschamps Anne  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6538 LGO - Delacourt Christophe Delacourt Christophe Delacourt Christophe  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

  Author

UMR 6554 LETG - Suanez Serge Suanez Serge Suanez Serge  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

Keywords ( Theme )
  • SNO DYNALIT , Beach profile , Digital Elevation Model , Coastal monitoring , Nearshore waves , Astronomical tides , Bathymetry , Orthoimage
Keywords ( Place )
  • Brittany , Finistere , Porsmilin
GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Orthoimagery , Elevation
Access constraints
Other restrictions
Other constraints
Pas de restriction d'accès public Pas de restriction d'accès public No limitations to public access
Use limitation
Free use subject to mentioning the source (at least the name of the producer) and the date of its last update
Use constraints
Other restrictions
Other constraints
Supplier partner is not able to guarantee the accuracy, update, integrity, completeness of data and in particular that they are free of errors or inaccuracies, including location, identification or qualification. No warranty as to the fitness of the data for a particular purpose is made by the supplier partner. Users use the data under their full responsibility, without recourse against the supplier partner whose liability can be incurred due to damage resulting directly or indirectly from the use of this data. In particular, it is up to users to decide, on their own responsibility: the opportunity to use the data; File compatibility of their computer systems; adequacy of the data to their needs; that they have sufficient competence to use the data. The partner supplier is in no way responsible for external elements including data analysis tools, hardware, software, networks ... used to view and / or process data. The user ensures verify the timeliness of the information provided is compatible with the use of it.
Spatial representation type
Grid
Spatial representation type
Text, table
Distance
0.5  m
Metadata language
Français French
Character set
UTF8
Topic category
  • Geoscientific information
N
S
E
W


Unique resource identifier
RGF93 / Lambert-93 + NGF-IGN69 height (EPSG:5698) RGF93 / Lambert-93 + NGF-IGN69 height (EPSG:5698) RGF93 / Lambert-93 + NGF-IGN69 height (EPSG:5698)
Distribution format
  • ASC (1.0 )

    Specification

  • GeoTIFF (1.0 )

    Specification

  • MATLAB (2018b )

    Specification

OnLine resource
Porsmilin_DEMs_bathy.zip  

Porsmilin bathymetric DEM (2000-2019)

OnLine resource
MNT-Bathy_Porsmilin_2003-2019  

Bathymetric DEMs - Porsmilin beach - 2003-2019 (WMS-T)

OnLine resource
SNO DYNALIT  

SNO DYNALIT

Hierarchy level
Dataset

Conformance result

Date ( Publication )
2010-12-08
Explanation
Article 7, paragraph 1, of Directive 2007/2 / EC corresponds to the technical procedures for interoperability: this is the regulation on interoperability: regulation n ° 1253/2013 of 21 October 2013 amending and supplementing Regulation n ° 1089/2010 of 23 November 2010
Pass
true
Statement
24 bathymetric DEMs have been obtained over the period 2008-2019 from hydrographic surveys using a boat-mounted multi-beam echo-sounder (survey method MES). Bathymetric surveys are generally undertaken during spring high tides to increase surface coverage. A topographic survey is often planned the same day at low tide, providing independent data for quality verification and data fusion. The hydrographic equipment aboard the ship consists in a multi-beam echo sounder (RESON SeaBat 8160 until end 2011, KONGSBERG EM 3002 thereafter) connected to RTK-GNSS and inertial measurement unit sensors. Using the EM 3002 (similar specifications prevail for the SeaBat), data were recorded by 254 equidistant beams emitting sound pulses at 300 kHz. Angular resolution was set to 120°, resulting in a maximum lateral coverage of approximately 50 m per track and inter-beam distances of 0.2 m at 15 m water depth (the maximum depth at the study site). In addition, for each survey, probe soundings recorded sound celerity profiles throughout the water column. Planning, collection and processing of bathymetric data were performed using QPS Qinsy software suite (https://qps.nl/qinsy/), which after guided correction of inertial movements of the boat, sound celerity gradients and tidal effects, allowed producing bathymetric DEMs with sub-metre spatial resolutions. Using stable regions of the study site (bedrock reef), bathymetric DEM quality was estimated to be represented by accuracy (mean error) and precision (standard deviation of error) of 0.04 m and 0.07 m, respectively.
Description
To facilitate reuse of the DEMs and to allow direct comparisons, consistent grids and a standard sampling resolution of 0.5 m were chosen to fit the entire dataset. Where necessary, DEM resampling was performed using linear interpolation (function griddata in MATLAB). To reduce operators’ influence on decisions such as filtering outliers and filling gaps in initial data, also contributing to homogenising survey precision across the dataset, all DEMs were applied the same post-processing routine that consists in (i) using the mean elevation difference parameter to filter DEM elevations outside the range μ ± 5σ, with  and σ calculated for each surface grid cell using a three-by-three moving window, and (ii) reasonably filling missing data by averaging at least three known elevations. For the latter, search is done within circles centred on the missing DEM cell with radii increasing incrementally (increment = grid spacing) until at least three known values are found or until a size limit is attained (1 and 10 m over reef and sand, respectively). Reef/sand classification was performed using a combination of orthoimage and roughness analyses. As a final step, DEMs were assessed for systematic and random errors using multi-temporal ground truths, obtained by averaging available surveys over stable terrain, with eventual corrections applied through horizontal and vertical registrations. DEMs are provided in separate folders in geotiff (.tif), Arcgrid ASCII (.asc) and MATLAB (.mat) formats. They are accompanied by detailed metadata text files and figure plots summarising the results of post-processing and error evaluation. The following naming convention is used: yyyymmdd_Porsmilin_MES_L93_IGN69_0.5, where yyyymmdd is the survey date.
Rationale
DEM harmonization

Metadata

File identifier
58ca9626-a0d3-410a-b775-51b29400f854   XML
Metadata language
Français French
Character set
UTF8
Parent identifier
74ecce0a-e650-4c41-9970-97e4602f1cd8
Hierarchy level
Dataset
Hierarchy level name
Parent
Date stamp
2021-09-30T14:15:10
Metadata standard name
ISO 19115
Metadata standard version
1.0

  Point of contact

UMR 6538 LGO - Bertin Stéphane Bertin Stéphane Bertin Stéphane  
European Institute for Marine Studies, Technopôle Brest-Iroise, Rue Dumont d'Urville Plouzané 29280 France

 
 

  Overviews

Porsminlin bathymetric DEM

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