Bathymetric Data, EM122 AOI (Mediterranean, M144-1)

Bathymetry data was acquired during R/V Meteor cruise M144/1 in the aegean region of the Mediterranean Sea between 27.12.2017 and 18.01.2018. The cruise aimed to clarify the causal links between climate and ecosystem change on the one hand by sociocultural evolution on the other hand by climatic and environmental change that can be aligned with the archeological record. CI Citation: Paul Wintersteller ( seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of data source: During the M144/1 cruise, the hull-mounted KONGSBERG EM122 multibeam ecosounder (MBES) was utilized to perform bathymetric mapping in medium to deep waters. Two linear transducer arrays in a Mills Cross configuration transmit acoustic signals of a nominal sonar frequency of 12 kHz. With 432 soundings per swath, the emission cone has a dimension of max 150° across track and 1° along track. With a reception obtained from 288 beams, the actual beam footprint is 1° by 2°. Depending on the roughness of the seafloor and the water depth, the swath width on a flat bottom is maximum six times the water depth. For further information on the system, consult https://www.km.kongsberg.com/. The position and depth of the water column is estimated for each beam by using the detected two-way-travel time and the beam angle, ray-traced through the water column, utilizing a proper sound speed profile. Throughout this cruise the swath width was mainly at 120° and did not exceed 130°. Responsible person during this cruise / PI: unstated .

Simple

Alternate title

EMODNET-IFR-WESTMED-2012
Date (Creation)
2019-12-16
Date (Revision)
2020-12-07
Citation identifier
1568_2017_M144-1_EM122_Mediterranean
Point of contact
Organisation name Individual name Electronic mail address Role

GEOMAR Helmholtz Centre for Ocean Research Kiel

info@geomar.de

Originator

PANGAEA - Data Publisher for Earth & Environmental Science

info@pangaea.de

Custodian

SeaDataNet device categories

  • multi-beam echosounders

Parameter Discovery Vocabulary (P02)

  • Bathymetry and Elevation

GEMET - INSPIRE themes, version 1.0

  • Hydrography
Access constraints
Creative Commons Attribution 4.0 International
Use constraints
Other restrictions
Other constraints

DO NOT USE FOR NAVIGATION
Spatial representation type
Grid
Denominator
5000
Distance
15  meter
Language
English
Character set
UTF8
Topic category
  • Oceans
Begin date
2018-01-14
End date
2018-01-16 After
N
S
E
W
thumbnail




Geographic identifier
http://vocab.nerc.ac.uk/collection/C19/current/3_1_2_4/
Description

Map projection parameters, values and units :

Axes units :
Codespace

EPSG
Version

7.4
Reference system identifier
EPSG / WGS 84 (EPSG:4326) / 7.4
Number of dimensions
3
Dimension name
Column
Dimension size
3
Dimension name
Row
Dimension size
147481653
Dimension name
Time
Dimension size
1
Resolution
10  year
Cell geometry
Point
Transformation parameter availability
No
Checkpoint Availability
No
Point in Pixel
  • Center
Distribution format
Name Version

XYZ Ascii
Distributor contact
Organisation name Individual name Electronic mail address Role

PANGAEA - Data Publisher for Earth & Environmental Science

info@pangaea.de

Distributor
Transfer size
662.9
OnLine resource
Protocol Linkage Name

WWW:LINK

 		https://doi.pangaea.de/10.1594/PANGAEA.887862

PANGAEA

WWW:LINK

 		https://doi.pangaea.de/10.1594/PANGAEA.913074

PANGAEA

WWW:DOWNLOAD

 		https://downloads.emodnet-bathymetry.eu/high_resolution/3234_1568_2017_M144-1_EM122_Mediterranean.emo.zip

WWW:LINK

 		https://tiles.emodnet-bathymetry.eu/

EMODnet Bathymetry WMTS service

WWW:LINK

 		https://emodnet.ec.europa.eu/geoviewer/

EMODnet viewer
Hierarchy level
Dataset

Vertical extent

Minimum value
186.28
Maximum value
1070.74

Vertical CS

Vertical datum

Statement

no information
Hierarchy level
Feature
Dataset

accuracy

Gridded data positional accuracy

Name of measure

horizontal accuracy
Measure identification
horizontal accuracy of coordinate
Measure description

Kongsberg SeaTex AS - Seapath 320
Evaluation method description

Estimation based on positioning system of the vessel

Quantitative result

Value type
horizontal accuracy
Value
3

Quantitative attribute accuracy

Name of measure

depth
Measure identification
depth accuracy
Measure description

Multibeam 12 kHz system, Kongsberg EM122
Evaluation method description

Visual quality evaluation

Quantitative result

Value
not defined

Conformance result

Title

Shoal bias
Date
Explanation

Offset up to 2 m
Pass
Yes
Hierarchy level
Software
Other

software
Hierarchy level
Property type
Description

parameters of data processing

Attributes

No information provided.
Statement

Description of data processing : EMODnet processing methodology using Globe software
Description

Description of processed data sources : Postprocessing and products were conducted by the Seafloor-Imaging & Mapping group of MARUM/FB5, responsible person Paul Wintersteller ( seafloor-imaging@marum.de). The open source software MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, https://www.mbari.org/products/research-software/mb-system, 2017) was utilized for this purpose. Tide and a sound velocity profile were applied to the M144/1 data; there were no corrections for roll, pitch and heave applied. Using Mbeditviz, artefacts were cleaned manually. NetCDF (GMT) grids of the edited data as well as statistics were created with mbgrid. The published bathymetric EM122 grid of the cruise M144/1 has a resolution of 35 m. No total propagated uncertainty (TPU) has been calculated to gather vertical or horizontal accuracy. A higher resolution is, at least partly, achievable. The grid extended with _num represents a raster dataset with the statistical number of beams/depths taken into account to create the depth of the cell. The extended _sd -grid contains the standard deviation for each cell. The DTMs projections are given in Geographic coordinate system Lat/Lon; Geodetic Datum: WGS84. All grids produced are retrievable through the PANGAEA database (www.pangaea.de). The

Hierarchy level
Dataset

Absolute external positional accuracy

Name of measure

emodnet-bathymetry.QI.Horizontal
Value
3 - < 20 m

Absolute external positional accuracy

Name of measure

emodnet-bathymetry.QI.Vertical
Value
2 - MBES low frequency (lower than 100kHz) (similar than 1+2%d)

Domain consistency

Name of measure

emodnet-bathymetry.QI.Purpose
Value
2 - Bathymetric/morphologic survey

Metadata

File identifier
SDN_CPRD_3234_1568_2017_M144-1_EM122_Mediterranean XML
Metadata language
English
Character set
UTF8
Hierarchy level name

Product record
Date stamp
2025-04-14T11:44:04.648543Z
Metadata standard name

ISO 19115:2003/19139 - EMODNET - BATHYMETRY
Metadata standard version

1.0
Metadata author
Organisation name Individual name Electronic mail address Role

Marum - Center for Marine Environmental Sciences, University of Bremen

info@marum.de, seafloor-imaging@marum.de

Author
 
 

Overviews

overview

Spatial extent

thumbnail

Keywords

GEMET - INSPIRE themes, version 1.0

Hydrography
Parameter Discovery Vocabulary (P02)

Bathymetry and Elevation
SeaDataNet device categories

multi-beam echosounders


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