Technology in Focus: Bathymetric Lidar

With sea level rise and increases in the severity of extreme natural events, there has been a renewed push to further our understanding of the coastal zone. Fundamental to understanding risk in areas of high vulnerability is capturing the near-shore land and sea surface. Bathymetric Lidar is the most effective and cost-efficient technology to capture both the land and seafloor simultaneously to provide a continuous, detailed 3D elevation model along the coastline. Its ability to successfully capture elevation on both sides of the coastline, over areas stretching more than 100km along the coast, has made bathymetric Lidar the ‘gold standard’... (read more)
2016-10-19 10:46:47

Unsurveyed Oceans Linked to Over-ocean Flights

A big part of the oceans is still unmapped, which is why efforts are undertaken to reduce the amount of ‘blank’ areas in the ocean from the perspective of available data. Walter H.F. Smith, Karen M. Marks and Thierry Schmitt have calculated that 60% of all unique overseas flight routes travel over unmapped areas, and the quality of the areas that are mapped varies widely. This lack of quality shows when an aircraft is missing as this hinders searches. At the time that Flight MH370 went missing, only 5% of the southeast Indian Ocean seafloor had been surveyed. Between the... (read more)
2017-03-27 01:52:06

Ocean Infinity to Continue Search for Missing Malaysian Airlines Flight MH370

The proposal by Ocean Infinity, a specialist in collecting high-resolution geophysical seabed data, to continue the search for the missing Malaysian Airlines flight MH370 has been accepted by the Government of Malaysia. The search will focus initially on the zone identified by the Australian Transport Safety Bureau. The 'Seabed Constructor' vessel is now close to the search area, which will enable work to commence imminently. The project is expected to last for 90 days. Ocean Infinity will take on the economic risk of the renewed search, only receiving payment if the aircraft wreckage is located. Commenting on the announcement, Ocean Infinity’s... (read more)
2018-01-10 01:05:30

Submerged Flying Boat Wreck Survey

SRD (Sonar Research & Development Ltd) have completed a detailed sonar survey of the submerged wreck of a Sunderland flying-boat in Pembroke Dock (South Wales, UK). The survey of the RAF Sunderland, which sank at her moorings on a stormy night in November 1940, will be used by the Pembroke Dock Sunderland Trust in their efforts to recover, restore and eventually display this unique World War Two aircraft.   To undertake the survey, SRD deployed its Subsea Visualisation System (SVS3) from a locally-available vessel. The digital multibeam sensors, operating at a frequency of 240kHz, were able to image the wreck... (read more)
2008-02-20 11:05:54

Third Fugro Vessel with AUV Joins Search for Missing MH370

An additional Fugro vessel has been commissioned to carry out underwater search activities for missing Malaysia Airlines MH370. Fugro Supporter, a multi-purpose offshore survey vessel, is currently on its way to the Southern Indian Ocean search area, having conducted trials in Bali. The vessel is equipped with a Kongsberg HUGIN 4500 autonomous underwater vehicle (AUV) which will be used to scan those portions of the search area that cannot be searched effectively by the equipment on other vessels. The addition of the Fugro Supporter, which is expected to commence search activities in late January, is jointly funded by the governments... (read more)
2015-01-19 09:00:20

Fugro’s Airborne Technology Deployed in Response to New Zealand Earthquake

Fugro’s LADS technology is being deployed in New Zealand to assist in relief efforts following the damaging 7.9 magnitude earthquake near Christchurch on 14 November 2016. At the request of the New Zealand government, the Royal Australian Navy (RAN) Laser Airborne Depth Sounder (LADS) flight is to conduct a rapid hydrographic survey of the seafloor in the coastal margins of the north-east coast of the South Island. RAN LADS commanding officer, Flight Lieutenant Commander Susanna Hung, explained the mission. “We will fly over the area and collect hydrographic survey data, which will reveal what has happened below the waterline, and... (read more)
2016-12-08 08:57:28

New Zealand Navy Increase REMUS AUV Capability

The Royal New Zealand Navy (RNZN) has recently purchased an additional Hydroid Remus 100 AUV. This purchase will bring the fleet to four complete systems. The RNZN purchased two REMUS 100 systems in 2006 and followed up with a third in 2007. Along with the new vehicle, the RNZN has also ordered a number of sensors and upgrades for their existing systems, designed to increase their operational capability. Since entering service, the vehicles have successfully performed a wide range of military and civilian tasks including location of downed aircraft, police and customs operations and military exercises both within New Zealand... (read more)
2010-05-26 02:34:04

Suitability of Airborne Lidar Bathymetry for The Netherlands

Netherlands authorities (Rijkswaterstaat and the Hydrographic Office of the Royal Netherlands Navy) are considering alternatives to singlebeam echosounding and MBES in the shallow water areas of their responsibilities. Airborne Lidar Bathymetry (ALB) is such an alternative system: it measures bathymetry by laser ranging with a pulse frequency of 1000 Hz from an airborne platform. ALB relies on the penetration of the light waves through water to measure distance. The propagation of light in water is hindered by the absorption of light by the elements in the water. Light is attenuated at increasing depth because of diffraction and absorption. The maximum... (read more)
2008-01-01 01:00:00

First Developments of Electronic Navigation Systems

How Television ‘Ghosts’ Contributed to Positioning
Before and during the Second World War, there were several developments in electronics that changed the course of hydrographic history. These aircraft bombing systems were what ultimately led from the medium-frequency systems to super-high-frequency navigation systems that characterised navigational control for hydrographic surveying throughout much of the world for the next 50 years. Not by coincidence did they also lead to many advances in distance measurement in geodetic and plane surveying. Oboe, Gee, Decca and Loran were developed by the British for various types of navigation during the war. Oboe was the equivalent of a super-high-frequency range-range system in which a... (read more)
2009-03-27 12:00:00

Airborne Oil Spill Remote Sensing

Remote sensing of oil spills in conjunction with their prevention and combat has long since evolved into a key element for the protection of the marine environment. The impact of oil spills caused by ship traffic and platform discharges has induced decision makers worldwide to establish airborne pollution surveillance services.<P> Assuming state-of the-artsurveillance equipment onboard the aircraft, these services can provide (1) flexible overviews of survey areas with regard to marine pollution and sea traffic, (2) quick assessments of oil spill sites, and (3) deterrence of potential polluters. Airborne pollution surveillance has proven to be an indispensable tool for the... (read more)
2008-04-02 12:00:00
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