Seafloor litter - Density per trawl normalized per km² 2011/2024 v2025
This visualization product displays the density of seafloor litter per trawl.
EMODnet Chemistry included the collection of marine litter in its 3rd phase. Since the beginning of 2018, data of seafloor litter collected by international fish-trawl surveys have been gathered and processed in the EMODnet Chemistry Marine Litter Database (MLDB).
The harmonization of all the data has been the most challenging task considering the heterogeneity of the data sources, sampling protocols (OSPAR and MEDITS protocols) and reference lists used on a European scale. Moreover, within the same protocol, different gear types are deployed during bottom trawl surveys.
In cases where the wingspread and/or the number of items were/was unknown, it was not possible to use the data because these fields are needed to calculate the density. Data collected before 2011 are concerned by this filter.
When the distance reported in the data was null, it was calculated from:
- the ground speed and the haul duration using the following formula: Distance (km) = Haul duration (h) * Ground speed (km/h);
- the trawl coordinates if the ground speed and the haul duration were not filled in.
The swept area was calculated from the wingspread (which depends on the fishing gear type) and the distance trawled:
Swept area (km²) = Distance (km) * Wingspread (km)
Densities were calculated on each trawl and year using the following computation:
Density (number of items per km²) = ∑Number of items / Swept area (km²)
Percentiles 50, 75, 95 & 99 were calculated taking into account data for all years.
More information on data processing and calculation are detailed in the attached document.
Warning: the absence of data on the map does not necessarily mean that they do not exist, but that no information has been entered in the Marine Litter Database for this area.
Simple
- Alternate title
- sl_totalabundance
- Date ( Creation )
- 2024-12-12T00:00:00+01:00
- Edition
- 1.0
- Identifier
- DOI:10.13120/ef82b847-44f9-47a7-b9e7-d8bde3f2dc2d
- Credit
- EMODnet Chemistry
Point of contact
+33 (0)2 98.22.46.44
http://www.ifremer.fr/sismer/
+33 (0)2 40.37.40.01
https://wwz.ifremer.fr/Recherche-Technologie/Departements-scientifiques/Departement-Oceanographie-et-Dynamique-des-Ecosystemes/VIGIES
+33 (0)2 40.37.40.01
https://wwz.ifremer.fr/Recherche/Departements-scientifiques/Departement-Oceanographie-et-Dynamique-des-Ecosystemes/VIGIES
+33 (0)2 98.22.46.44
http://data.ifremer.fr/SISMER
http://www.ubt.edu.al
http://www.cefas.co.uk/
https://www.coispa.it/index.php?option=com_content&view=article&id=14:about-us&catid=11&lang=en&Itemid=124
https://www.aqua.dtu.dk/English
http://era.org.mt
+372 6 718 900
http://www.sea.ee
+30-22910-76347
https://www.hcmr.gr/
+34 942 275 072
http://www.ieo.es/santander
+33 (0)3 21.99.56.01
https://wwz.ifremer.fr/manchemerdunord/Environnement/LER-Boulogne-sur-Mer
+33 (0)2 97 87 38 01
https://wwz.ifremer.fr/lermpl/
+33 (0)3 21 99 56 01
https://wwz.ifremer.fr/manchemerdunord/
+33 (0)2 98 22 45 47
https://wwz.ifremer.fr/sciences_technologies_halieutiques
+33 (0)2 31 51 56 01
https://wwz.ifremer.fr/manchemerdunord/
+33 (0)4 99 57 32 94
https://wwz.ifremer.fr/mediterranee/implantations/Sete
http://www.izvrs.si/?lang=en
+46-(0)173-464 90
http://www.slu.se/kustlaboratoriet
+382 32 33 45 70
https://www.ucg.ac.me/ibm/
+47 55 23 85 31
http://www.imr.no
+385 21 358650
+353-91-387201
http://www.marine.ie
+44 (0)1224 295511
40 241 831274
http://www.rmri.ro
http://www.nmfri.gdynia.pl
https://www.marenostrum.ro/
+46-(0)18-67 20 00
https://www.slu.se/
+49 471 94460 199
https://www.thuenen.de/en/sf/
https://www.wur.nl/nl/Onderzoek-Resultaten/Onderzoeksinstituten/marine-research.htm
- Thèmes Sextant ( Theme )
-
- /Human Activities/Pollution
- GEMET - INSPIRE themes, version 1.0 ( Theme )
- Parameter Discovery Vocabulary (P02) ( parameter )
- SeaVoX salt and fresh water body gazetteer ( reference-geographical-area )
- Keywords ( Theme )
-
- EMODnet Chemistry
- Matrix Categories ( parameter )
- EMODnet Chemistry chemical groups ( parameter )
- Mission Atlantic - Resources ( Theme )
-
- Data
- Mission Atlantic - Case Studies ( Theme )
-
- Celtic Seas
- Mission Atlantic - Work Package ( Theme )
-
- WP4 Benthic Mapping
- Mission Atlantic - BODC Parameters ( Theme )
-
- /Environment/Pollution
- Mission Atlantic - Data type (DMP) ( Theme )
-
- Spatial data products
- Ocean Hackathon - City and challenge ( Place )
-
- /Boulogne-sur-Mer/BOL04
- /Boulogne-sur-Mer/BOL02
- /Boulogne-sur-Mer/BOL06
- /Concepción/CON06
- /Bournemouth/BOR01
- /Kuala Lumpur/KUL08
- /Peniche/PEN01
- /La Rochelle/LAR01
- /Boulogne-sur-Mer
- /Brest
- /Toulon
- /Bournemouth
- /La Rochelle
- /Cherbourg
- /Plymouth
- GDI-Vlaanderen Trefwoorden ( Theme )
- Use limitation
- CC BY 4.0: https://creativecommons.org/licenses/by/4.0/
- Access constraints
- unrestricted
- Use constraints
- Other restrictions
- Other constraints
- Usage is subject to mandatory citation: "This resource was generated in the framework of EMODnet Chemistry, under the support of DG MARE Call for Tender EASME/EMFF/2020/3.1.11/European Marine Observation and Data Network (EMODnet) - Lot 5 - Chemistry"
- Spatial representation type
- Vector
- Metadata language
- eng
- Topic category
-
- Oceans
- Description
- bounding box
))
- Begin date
- 2011-05-03
- End date
- 2024-03-21
Vertical extent
- Reference system identifier
- EPSG / WGS 84 (EPSG:4326)
- Geometric object type
- Point
- Distribution format
-
-
(
)
-
(
)
- OnLine resource
-
sl_totalabundance
(
OGC:WMS
)
Seabed litter - Density (Nb. Items/km2)
- OnLine resource
-
Description of the layer's fields
(
WWW:LINK
)
Description of the layer's fields
- OnLine resource
-
Direct Download
(
WWW:DOWNLOAD-1.0-link--download
)
Direct Download
- OnLine resource
-
EMODnet Map Viewer
(
WWW:LINK
)
EMODnet Map Viewer
- OnLine resource
-
Visualization products for Beach and Seafloor Litter data
(
WWW:LINK
)
Methodologies applied to create the maps
- OnLine resource
-
Guidelines and forms for gathering marine litter data
(
WWW:LINK
)
Guidelines and forms for gathering marine litter data
- Hierarchy level
- Series
Conformance result
- Date ( Publication )
- 2010-12-08
- Explanation
- See the referenced specification
- Statement
- The original datasets can be searched and downloaded from EMODnet Chemistry Chemistry CDI Data and Discovery Access Service: https://cdi-chemistry.seadatanet.org/search
- File identifier
- ef82b847-44f9-47a7-b9e7-d8bde3f2dc2d XML
- Metadata language
- en
- Character set
- UTF8
- Hierarchy level
- Series
- Hierarchy level name
- Product record
- Date stamp
- 2025-02-27T14:24:14.447461Z
- Metadata standard name
- ISO 19115:2003/19139 - EMODNET - SDN
- Metadata standard version
- 1.0
Overviews

Spatial extent
))
Provided by
