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High Value Dataset (HVD): false Publisher: Geological Survey Ireland Resource Format: HTML

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  • 16 views

    This map shows the distribution of seabed substrate classes within Irish waters. High resolution grids of MBES bathymetry and backscatter data have been interpreted into 5 substrate classes: Rock, Coarse sediment, Mixed sediment, Sand and Mud to muddy Sand classes. Backscatter is

  • 4 views

    A grab sample is a sample of sediment taken from the seabed. This is a sediment sample database of samples collected to date by INSS, INFOMAR and related projects. They include ADFish, DCU, FEAS, GATEWAYS, IMAGIN, IMES, INIS_HYRDO, JIBS, MESH, SCALLOP, SEAI, UCC. Each sample poin

  • 8 views

    A sound velocity profile (SVP) indicates the speed of sound in water at different vertical levels. SVPs are taken to calibrate the multibeam systems as they are acquiring data. It can be viewed in tabular form, with pairs of columns corresponding to ocean depth and the speed of

  • 7 views

    A Sub-bottom profile aims to identify and characterise layers of sediment or rock under the seabed. These systems also can be helpful in locating hard objects buried beneath the seabed shallow sediment layers. In sub-bottom profiling, a sound source directs a pulse toward the sea

  • 627 views

    This dataset shows the point locations of shipwrecks in Irish Waters surveyed by INSS and INFOMAR national seabed mapping projects. Over 480 surveyed shipwrecks have been recorded in the INFOMAR shipwreck inventory. The database accurately records the location of shipwrecks (know

  • 20 views

    Survey tracklines delineate the line along which the vessel travelled as it was surveying. The vessel collects multibeam echosounder data (MBES) by emitting a fan of soundwaves and recording the reflected signal. The area of seabed ensonified is known as the footprint and the are

  • 36 views

    This dataset shows the area of seabed mapped by both the INFOMAR and Irish National Seabed Survey projects to date. Each survey leg is represented by a unique polygon whose title is coded using the initials of the vessel that did the survey, the year the survey was completed and

  • 106 views

    Gravity is the measure of the force of attraction at any point on the Earth's surface. This force will vary depending on the rock type present. Gravity data is used for interpreting sub-seabed geology often in the context of the hydrocarbon exploration and mining industry, as wel

  • 24 views

    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 a successor to the Irish National Seabed Survey (INSS) and con

  • 620 views

    The term bathymetry refers to the depth of the ocean relative to sea level. It can also be used to describe the submarine topography or underwater terrain. INFOMAR bathymetry data is measured by multibeam echosounders (MBES). MBES transducers transmit multiple high frequency puls

  • 72 views

    The term backscatter refers to the strength of the returning echo emitted from a multibeam echousounder (MBES). MBES transducers transmit multiple high frequency pulses of sound from beneath a vessel in a fan shape down to the seabed. The amount of energy reflected back to the ve

  • 55 views

    Geological survey in Galway Bay. Geological ground truthing survey of equipment in Galway Bay.

  • 12 views

    This inter-institutional survey took place in May 2011, as part of a Geological Survey of Ireland-led ground-truthing programme. The Marine Institute's R.V. Celtic Explorer collected sea bed samples from an East-West transect along the top of the high. Vibrocores, grab sampl

  • 371 views

    A side scan sonar is used when high resolution information on specific seabed features is required (e.g. habitat mapping or wreck investigations). The unit is towed behind the vessel in close proximity to the seabed and transmits high frequency sound pulses that map the seabed on

  • 36 views

    Seabed mapping of the Atlantic Ocean between Ireland and Canada. Mapping the Atlantic. Contributing to the transatlantic mapping strategy and ground truthing at a variety of stations. Recovery of the M6 weather buoy.

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