Bathymetry From Space

Global grids of synthetic bathymetry make it a simple matter to portray generalised ocean depths in all parts of the world, except the central Arctic Ocean. Derived from measurements of satellite height above the sea surface, synthetic bathymetry lacks the resolution and accuracy of acoustic soundings, plus it contains flaws that arise from measurement and computational processes. Users must therefore exercise care in the analysis and presentation of such information. In Part II of his satirical account Gulliver’s Travels into Several Remote Nations of the World, Jonathan Swift described his protagonist’s thoughts after a close-up observation of the flawed complexions... (read more)
2008-01-19 12:00:00

Excited by Automation Driven by Autonomous Vehicles

Hydro International Interviews Capt. Shep Smith
NOAA is one of the bigger organisations in the world that has surveying and charting in its portfolio. It’s an immense task as the USA has about 95,000 miles of coastline, important ports and a wide range of users – from recreational boaters to the biggest container vessels and tankers. The country also has to deal with environmental disasters like hurricanes and oil spills. NOAA is undergoing changes as the chart portfolio is ‘going digital’ and new initiatives such as using Maritime Autonomous Systems (MAS) for surveys. Hydro International interviews Capt Shep Smith, who generously gave an insight behind the scenes. NOAA is one of the bigger organisations in the world that has surveying and charting in its portfolio. It’s an immense task as the USA has about 95,000 miles of coastline, important ports and a wide range of users – from recreational boaters to the biggest container vessels and tankers. The country also has to deal with environmental disasters like hurricanes and oil spills. NOAA is undergoing changes as the chart portfolio is ‘going digital’ and new initiatives such as using Maritime Autonomous Systems (MAS) for surveys. Hydro International has interviewed Capt Shep Smith, who generously gave an insight behind... (read more)
2015-12-01 09:18:32

Sea Levels and the Coast

The oceans are a central part of the global climate system. As Roger Revelle, one of the early directors of the Scripps Institute of Oceanography, said, “The oceans exert a profound influence on mankind and indeed upon all forms of life on Earth. The oceans are inexhaustible sources of water and heat, and control the climate of many parts of the world.” He also recognised that “human beings are now carrying out a large-scale geophysical experiment of a kind that could have not have happened in the past nor be reproduced in the future”. Roger Revelle’s thoughts have even more... (read more)
2007-10-27 12:00:00

Candidates Presenting for IHO Office

First IHO Assembly to Elect Secretary-General and Directors
During the first IHO Assembly taking place from 24 to 28 April 2017 in Monaco, the represented Member States will elect the new Secretary-General and directors. There are currently nine candidates. 'Hydro International' posed the same 5 questions to all of them. Read on for a multi-interview in which they present themselves. The full interviews are available at www.hydro-international.com/iho-2017 . Giuseppe Angrisano and Joost Boers, Hydro International Some coastal states are not yet members of the IHO. How do you envisage improving the number of the IHO Member States? Bessero I would continue to focus on raising awareness of governments and other decision-makers... (read more)
2017-03-13 11:22:59

Wave Radars

A comparison of concepts and techniques
Radar Remote Sensing of ocean surface waves may in general be defined as measuring characteristics of the sea surface by means of electromagnetic waves so that the sea surface is itself not disturbed. The electro-magnetic waves transmitted by the radar antenna are scattered back from the sea surface, modulated in amplitude and phase or frequency by the interaction with the sea surface in motion. This modulation carries information about sea-surface characteristics, surface waves and currents. Oceanographic data is extracted from the backscatter signal by sophisticated signal processing and data analysis. Why remote sensing? Surface ocean waves may be measured by... (read more)
2008-01-01 01:00:00

Meet the Hydro International Team at Oceanology International (R-Y)

In the third week of March, the entire marine world will be gathering in London, as this is where the biannual Oceanology International event is taking place. The exhibition and the conference bring together technological and scientific developments. With over 550 exhibitors and a state of the art conference programme OI12 is definitely the place to be. OI12 will be held from 13 to 15 March at the ExCel Exhibition and Conference Centre in Londonfs Docklands. The organisers are expecting at least 7,000 visitors to attend. Hydro international will of course be present. We not only have a stand (No.... (read more)
2012-03-08 10:09:21

Meet the Hydro International Team at Oceanology International (G-P)

In the third week of March, the entire marine world will be gathering in London, as this is where the biannual Oceanology International event is taking place. The exhibition and the conference bring together technological and scientific developments. With over 550 exhibitors and a state of the art conference programme OI12 is definitely the place to be. OI12 will be held from 13 to 15 March at the ExCel Exhibition and Conference Centre in Londonfs Docklands. The organisers are expecting at least 7,000 visitors to attend. Hydro international will of course be present. We not only have a stand (No.... (read more)
2012-03-08 10:02:38

Preparing the European Fleet of Research Vessels for the Future

Greater Use of Autonomy Will Influence the Numbers of Personnel Required on Board
Recently, the European Marine Board published a report on the current status of the European fleet of research vessels. This Position Paper describes how the fleet will need to develop in the future to ensure that it will continue to provide the same high level of support to science and hydrography globally, as well as highlighting ways in which management could be made more efficient. This article is an extract of the report. Recently, the European Marine Board published a report on the current status of the European fleet of research vessels. This position paper describes how the fleet will need to develop in the future to ensure that it will continue to provide the same high level of support to science and hydrography globally, as well as highlighting ways in which management could be made more efficient. This article is an extract of the report. Many of the global challenges facing the world today – climate change, food and water security, health and well-being, sea-level rise and economic development – are driving... (read more)
2020-04-06 12:17:06

Technology for Hydrographic Purposes

Interview with Erik Hammerstad, Kongsberg Maritime AS
Hardware (and to a lesser extent software) for the hydrographic survey industry is mostly developed by technical experts not educated as hydrographic surveyors. Nevertheless, manufacturers have come up with equipment that has broadened and hugely opened up the possibilities for hydrographic and oceanographic investigations. What is the link between hydrography, which still very much depends on field experience, and technological developments? Or how is technology directed towards the invention of usable and workable equipment for hydrography? Hydro international interviewed Erik Hammerstad, Senior Principal Engineer /Hydrography Subsea of Kongsberg Maritime AS Norway. Please tell our readers something of your professional education... (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
Search Filter