US Navy Hydrography Is Back!

The US Navy has a strong tradition in hydrography and has restated its commitment to this field by naming the Commander of the Naval Meteorology and Oceanography Command as the ‘Hydrographer of the Navy’. This was the culmination of significant focus and effort during the past decade by the US Navy’s meteorology and oceanography (METOC) community to improve not just hydrography, but all forms of environmental data collection. During the Cold War, METOC resources were concentrated on deep-water operations; hydrographic expertise, especially among Naval officers, was not maintained at a sufficient level to support the current naval doctrine of littoral... (read more)
2008-01-01 01:00:00

‘Killer’ AUV Sonar System

In January 2001, C&C Technologies (C&C), a company based in Lafayette (Louisiana, USA), introduced the first commercially successful autonomous underwater vehicle (AUV) to the offshore industry. The AUV’s survey sensor suite, which included an EdgeTech side-scan sonar and sub-bottom profiler, performed well in the Gulf of Mexico and Brazilian offshore environments. However, West Africa proved more challenging – particularly for the sub-bottom profiler. C&C soon began searching for alternative technologies to provide better sub-bottom profiler penetration and higher resolution side-scan sonar imaging.Jim Chance, C&C Technologies (USA) Art Kleiner, EdgeTech (USA)<P> Narrator: Fast forward to the early autumn of 2004… C&C... (read more)
2008-04-02 12:00:00

Automated Side-scan Data Analysis

Side-scan sonar is well accepted as a tool for detection and visualisation of underwater objects and is widely used in support of safety of navigation surveys. Although side-scan sonars produce excellent images, these images are often difficult and time-consuming to review and analyse. These images typically contain spurious features and artefacts due to acoustic phenomena, such as refraction, and bottom characteristics, such as sand waves that result in a large number of false contacts. This article describes a research and development effort at Science Applications International Corporation to develop and apply advanced processing techniques in bottom target detection and image... (read more)
2007-10-03 12:00:00

Quality ENC Production for HOs

The challenges facing the contractor
Hydrographic Offices (HOs) all over the world are going digital in their production environment. New shipboard equipment and improved display techniques embrace all the latest technologies in the interests of ensuring the Safety of Life at Sea (SOLAS). HOs increasingly seek to produce and distribute ENCs to standards specified in IHO Special Publication S57 (edition 3.1). The production and validation of ENC datasets to achieve these stringent quality requirements are outlined here. The International Maritime Organization (IMO) has amended SOLAS articles relating to carriage requirements for the use of ECDIS in certain types of vessels. When production is outsourced manufacturers... (read more)
2008-01-01 01:00:00

Proliferation SeaSonde Coastal Current-Mapping Radars

HF interference to improve coverage performance
For several decades while coastal HF current-mapping radars were under development, they radiated rarely and only for a few weeks at a time. Now 120 commercial SeaSonde units have been sold and seventy operate continuously in permanent locations. Their numbers are presently increasing at a rate of about 35 per year and they are used for a variety of maritime purposes. Although emitting only 50 watts of power they can map currents to 200km on the lower frequencies; these signals may also travel half way around the world, thanks to overhead reflecting ionospheric layers. After all, these same layers have... (read more)
2008-01-01 01:00:00

Completion of the JICA Group Training Course

10 training course participants received IBSC Category B certification
On 17 December 2015, the closing ceremony of the JICA group training course for hydrographic surveying was held at JICA Tokyo International Center in Tokyo, Japan. At the closing ceremony, an IBSC Category B certification for Hydrographic Surveying was presented to 10 training course participants by Vice Admiral Shigeru Kasuga, chief hydrographer of Japan. The participants came from eight countries, namely the Ivory Coast, Egypt, Guyana, Indonesia, Myanmar, the Philippines, Tonga and Vietnam, and completed the course in six months. By Norio BABA, Akio YAMAMOTO, JHOD, Japan and Tomomi HIRATA, JICA Tokyo, Japan Considering this training course has now been conducted 45 times... (read more)
2016-02-11 04:01:07

Invited Reply

Hydrography or Hydrogeomatics?
In common with all sciences, hydrography too is undergoing rapid change with regard to data acquisition and processing, instrumentation, application and many other aspects. Differing ideas may be found within the hydrographic community concerning these developments, which direction to take, change in the nature of the science, etc. and some opinions are to some extent controversial. Hydro international would like to draw attention to such diverse opinions when and in whatever context they arise by modifying her traditional interview in this issue by a column entitled ‘Invited Reply’. The pertinent question will here be answered by six prominent figures from... (read more)
2008-01-01 01:00:00

Introducing GIS to Support Maritime Accessibility

Hydrographic Surveying in the Port of Rotterdam
The Port of Rotterdam is Europe’s largest port and is one of the world’s key logistic hubs. Hydrographic data is critical to the Harbour master’s department for the operation of the Port of Rotterdam, to support the nautical accessibility of the deep-sea vessels by electronic nautical chart. The introduction of PortMaps enables the Port of Rotterdam to produce a wide variety of information products, including ENCs, from the Port’s survey data, in less than 48 hours. With over 500 line connections to and from more than 1,000 ports around the globe, the Port of Rotterdam in The Netherlands is the cornerstone of international freight transport. It is the perfect base for import and export and a gateway to the European market and its more than 500 million consumers. However, this favourable location has one downside, namely siltation. Therefore, hydrographic surveys are conducted on a daily basis in the Port of Rotterdam using a survey programme based on siltation rates, dredging operations, port operations and client requests. Facts & figures about the Port of Rotterdam: Port area: 12,500ha (land... (read more)
2015-11-18 03:49:43

Lidar Bathymetry on the Alaskan North Slope

Inventory and Characterisation of More than 4,500 Shallow-water Bodies
In June 2014, the Bureau of Economic Geology, a research unit at the University of Texas at Austin, was contracted to conduct an airborne bathymetric Lidar survey on the Alaskan North Slope. The purpose of the project was to further determine, understand, and map the local landscape and thaw-lake attributes of an area west of the Dalton Highway and Sagavanirktok (Sag) River, approximately 30km southwest of Deadhorse, Alaska. Researchers from the Bureau had visited the area in 2012 and found bathymetric Light Detection and Ranging (Lidar) to be an effective tool for measuring the area’s lakes. The group returned in... (read more)
2016-04-04 10:08:41

AEM Bathymetry

Using geophysical exploration techniques to map shallow seawater depths
Airborne Electro Magnetic Bathymetric (AEMB) mapping is useful in turbid and surf-zone waters where lidar systems are not fully effective. Coastal areas of hydrographic importance containing turbidity, shoals and channels have been surveyed. This article describes AEM systems, gives highlights from surveys in Sydney Harbour and mentions refinements that would improve bathymetric accuracy. For several decades geophysicists have been using a transmitter loop fixed to an aircraft or towed by a helicopter to emit a magnetic field into the ground to search for mineral deposits. Currents thus induced in the ground generate a return magnetic field that can be detected... (read more)
2008-01-01 01:00:00
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