New Generation Hydrographic Databases

Enhancing data availability
The importance of data availability is increasingly being recognised, not just as an important topic for an exclusive section of the geospatial community but all over the geospatial spectrum, including the hydrographic community. If data is not available it’s no use! Traditionally, hydrographic production systems have data spread over multiple (chart) files and might be set up to include (relational) databases e.g. to store point features such as navigational aids. This has, for instance, been done for more than a decade with CARIS GIS, a widely used tool for chart production at Hydrographic Offices (HOs) and in combination with other... (read more)
2008-01-01 01:00:00

Searching for HMS Terror

Knowledge Gained in the Search for Franklin
“We know where the target is not located” is the only guaranteed result of any search expedition. This statement does not make for exciting headlines, however, the value of knowledge gained during the search itself and its many benefits to a variety of end-users, cannot be easily dismissed. The 2015 Franklin Expedition search coordinated by Parks Canada was the continuing multi-year, multi-partner effort that saw the discovery of HMS Erebus in September of 2014. In this article we will discuss the knowledge gained and multiple uses of the data collected toward our conclusion of verifying where HMS Terror is not... (read more)
2016-04-04 09:52:54

Flexible High-resolution Seismic Method

Used for Qualification of the Seabed
Traditionally, the upper part of the shallow seabed is investigated using low frequency echo sounders to enable safe navigation, and even lower frequency profilers for seabed structure mapping. However, the results of these systems often lack accuracy and, as a consequence, seabed properties are not known. A more accurate method, which results in seabed parameters, is obtained by the addition of the ultra-high resolution seismic sub-bottom system package Silas. It will be shown that Silas can be added to any echo sounding or profiling system. High-quality data acquisition is possible with only minor changes to standard survey practices. The data... (read more)
2016-02-01 03:46:20

Satellite Derived Bathymetry Migration

From Laboratories to Chart Production Routine
Much has been said about Satellite Derived Bathymetry (SDB), but with the exception of SHOM, which led to the introduction of a number of SDB charts into the French chart series, next to nothing has been implemented within the international hydrographic community. This article aims to update readers as SDB, thanks to new generation satellites and modelling, seeing the light after going through a thirty years’ tunnel. In 2014, detailed tests and analysis conducted by government hydrographers, cartographers and recognised satellite scientists operating for a number of projects initiated by the European Space Agency, the WWF and other stakeholders, were completed,... (read more)
2015-10-12 04:09:41

Hydrography in Japan

Interview with D.Sc. Shoichi Oshima of the Japan Hydrographic Association
In spite of modern communications and connections by air, Japan still is for most people from Europe and America, a ‘far away country’. Hydro international is in the fortunate position to have very good contacts in Japan via dr. Shoichi Oshima, who served as Editorial Advisory Board (EAB) member since the start of Hydro international. The term of an EAB member is officially limited to two years and therefore dr. Shoichi Oshima is now leaving the EAB. On the occasion of his withdrawal he agreed to be interviewed and inform readers on some more details of hydrography in Japan. Can... (read more)
2008-01-01 01:00:00

Hydrographic Data Science

The Art and Craft of Making Useful Hydrography
We are seeing the introduction and application of automated technologies everywhere that supplant the common and accepted ways of doing jobs, writes Paul Cooper. Indeed, the pages of Hydro International are often dominated by examples of such applications, and most of us can think of concrete situations or comparisons between ‘then and now’. Modernisation and new thinking are dramatically changing the way hydrography is collected, processed and made available to users. As the focus is shifting from data collection to data analysis, hydrographic data scientists are becoming increasingly important. When I reported on board at the Naval Oceanographic Office in 1971, we had just... (read more)
2018-01-09 08:44:12

A Flooded Landscape Revealed

3D Hydrodynamic Model Developed for Sustainable Water Abstraction
During the last week of a hydrographic survey of Lough Derg, Ireland’s third largest lake, the remnants of a preserved flooded landscape were unveiled beneath the surface with each passing swath. In early 2015, Geomara was commissioned by the utility company, Irish Water, to undertake a bathymetry and side-scan sonar survey of Lough Derg as part of the planning and design process for the Water Supply Project, Eastern and Midlands Region. This project aims to find a new water source to supply the future needs of the Midlands and Greater Dublin Area.  Over the course of a typically wet and... (read more)
2016-04-04 10:00:41

The Drifters

“Although the Currents of the Ocean form a most important part of hydrography, yet it is only since the introduction of chronometers, and of celestial observations for the longitude at sea, (that is, not much more than forty years ago,) that a competent idea of their [currents] direction and force, in any kind of detail, could be obtained.” Thus wrote Major James Rennell in 1820 in the opening lines of his posthumously published (1832) An Investigation of the Currents of the Atlantic Ocean. Although the existence of oceanic currents had been known since the time of Columbus, the inability of... (read more)
2014-05-19 02:21:58

Lines in the Sea

Maritime Boundary Delimitation
Under the 1982 United Nations Convention on the Law of the Sea (UNCLOS) coastal states may claim rights over the resources of the sea and seabed up to 200 nautical miles (M) from their coasts, and seabed jurisdiction out to 350M where the continental margin is wider than 200M. But many boundaries are ill defined and even disputed. With the oil and gas industry operating in ever-deeper waters, the need for geodetically precise maritime boundaries has become increasingly pressing. This article explores the challenges involved. More than 30% of the world’s oceans now fall under state jurisdiction, with overlapping maritime... (read more)
2007-04-04 12:00:00

An Introduction to EGS

From modest beginnings with just a handful of employees in Hong Kong and the United Kingdom twenty-eight years ago, the EGS Group has now grown into an international group of companies with well over two hundred permanent staff. EGS provides global, specialist multidisciplinary services and products to the civil engineering, construction, telecommunications, power, maritime, hydrocarbon and mining industries. The group head office, EGS (Asia) Ltd, is based in Hong Kong. EGS International is located in the United Kingdom and services the western hemisphere, including Africa and the Middle East. Regional offices are located throughout South East Asia, including Singapore, Malaysia,... (read more)
2008-01-01 01:00:00
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