INFOMAR Seabed Survey Acoustic Backscatter (seafloor hardness)

Category: Science
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The INtegrated Mapping FOr the Sustainable Development of Ireland's MArine Resource (INFOMAR) programme is a joint venture between the Geological Survey of Ireland (GSI) and the Marine Institute (MI). The programme is the successor to the Irish National Seabed Survey (INSS) and concentrates on creating integrated mapping products related to the seabed.

Backscatter is the reflection of waves back to the direction they came from. By analyzing the amplitude of the returning sound wave it is possible to extract information about bottom structure and hardness, allowing for identification of bottom types. The bottom reflectivity properties depend on the hardness and the roughness of the seafloor surface. In simple terms a strong return signal indicates a hard surface (rocks, gravel), and a weak return signal indicates a soft surface (silt, mud).

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Theme Science
Date released 2013-06-20
Date updated 2021-05-17
Dataset conforms to these standards This Regulation sets out the requirements for the creation and maintenance of metadata for spatial data sets, spatial data set series and spatial data services corresponding to the themes listed in Annexes I, II and III to Directive 2007/2/EC.
Rights notes ['Creative Commons Attribution 4.0 International (CC BY 4.0) licence', '\n\nRights (can)\nShare- copy and redistribute the data in any medium or format\nAdapt- remix, transform, and build upon the material for any purpose, even commercially\n\nRequirements (must)\nAttribution- Give appropriate credit, provide a link to the licence, and indicate if changes were made. Do so in any reasonable manner, but not in any way that suggests the license endorses you or your use\nNo additional restrictions - may not apply legal terms or technological measures that legally restrict others from doing anything the license permits\n\nUnder the CC-BY Licence, users must acknowledge the source of the Information in their product or application.\n\nPlease use this specific attribution statement: "Contains Irish Public Sector Data (Geological Survey Ireland & Marine Institute) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence".', 'license']
Update frequency Annual
Language English
Landing page
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-17.1, 50.01],[-17.1, 57.1], [-5.01, 57.1], [-5.01, 50.01], [-17.1, 50.01]]]}
Spatial Reference Systems (SRS) WGS 84 (EPSG:4326)
Vertical Extent {"verticalDomainName": "sea level", "minVerticalExtent": "-4879", "maxVerticalExtent": "-1"}
Provenance information Backscatter processing within Caris software from multi-beam and single-beam echosounders.
Period of time covered (begin) 1996-01-01
Period of time covered (end) 2021-01-19