13 Results

INFOMAR Sound Velocity Profile

Geological Survey Ireland

Environment

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

INFOMAR Sub-bottom Profile

Geological Survey Ireland

Environment

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

INFOMAR Gravity

Geological Survey Ireland

Environment

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

INFOMAR Bathymetry

Geological Survey Ireland

Environment

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

INFOMAR Backscatter

Geological Survey Ireland

Environment

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

KRY11_03 Achill & Geo11_04, Mayo Bathymetry

Geological Survey Ireland

Environment

This is a 5 m resolution bathymetry tif in WGS84 projection. The survey was carried out on the R.V. Keary using a hull mounted EM3002 multibeam echosounder. Data was subsequently processed using CARIS HIPS and SIPS software. Depths in the survey area ranged from 0m to 55m, all de

INFOMAR Side Scan Sonar

Geological Survey Ireland

Environment

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