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EM2040CD Multibeam Echo Sounder water-column data (300 KHz) acquired in
the nearby of an offshore gas platform in Central Adriatic Sea


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Title of the dataset: "EM2040CD Multibeam Echo Sounder water-column data 
(300 KHz) acquired in the nearby of an offshore gas platform in Central 
Adriatic Sea"


Authors: Anna Nora Tassetti, Annalisa Minelli, Gianna Fabi (CNR-IRBIM)


Type of data: Raw data


Files names: "20181112_survey.zip", "20190724_survey.zip"


Abstract: The present data is shared in order to reproduce a study aimed 
to automatically extract and identify targets (gas seeps, fish schools 
and noise) from the water column using machine learning techniques. The 
dataset is composed by two surveys conduced over a square area 1X1 Km 
wide centered on a four-leg gas platform located in the Central Adratic 
Sea at a distance of 65 km from Ancona (Italy). Surveys were conduecd in 
calm sea conditions the 11-12-2018 and the 24-07-2019. The instrument 
used is a hull-mounted Multi Beam Echosounder Simrad Knogsberg EM2040CD, 
acquisition frequency is 300 KHz, the opening angles were 80°/10° (port, 
starboard) for one head and 10°/80° (port, starboard) for the other head 
maintainig 10° of overlap between the two swaths. The seabed depth is 
about 85 meters, the survey was conduced following 10 parallel lines N-S 
oriented with a distance of 150 meters one from the other in order to 
assure at least a superposition of 50% between one row and the other. A 
Trimble SPS855 GNSS Receiver with Omnistar HP/XP/VBS subscription was 
used for ship positioning, while a Kongsberg motion sensor MRU 5 and a 
Anschutz Compass Standard 20 Compact Type 110-222 NG001 gyro corrected 
pitch, roll, heave and yaw movements. Sound velocity profiles were 
systematically collected with an AML Oceanographic Smart SV&P sensor 
before the surveys were started (and repeated when needed), while a 
Valeport MiniSVS probe was mounted close to the transducers to 
continuously measure the sound velocity for the beamforming.


Contact person: annalisa.minelli@irbim.cnr.it


Contact organization: CNR-IRBIM (Italy), Largo Fiera della Pesca 1, 
60125 Ancona (Italy)


Dataset format: bathymetric data (organized in 20 .all files), water
column data (organized in 20 .wcd files), one sound velocity profile in
depth (.asvp file), 19 pressure files registered from the continuous 
velocity probe (.abs files) for each survey.


Dataset composition: The two datasets are shared as two distinct zip 
files, one for each survey


License: CC-BY 4.0


Date of dataset creation: 2021-02-17


Processing methodology: data has been collected using SIS (Seafloor 
Informative System, Kongsberg, Norway) which checked and logged it in 
real time during the acquisition.


Files dimensions: 2.038 GB, 1.936 GB


Bounding box: N,S,E,W = (445362.3,447311.3,4826649.3,4828607.3) [meters] 


Sea Area common name: Central Adriatic Sea


CRS: UTM WGS84 Zone 33 North (EPSG: 62633)