Developments and Trends in Multibeam Echo Sounders

The multibeam echo sounders available on the market are constantly evolving as technology advances and as sonar producers seek new ways of refining and utilising the products. In this article we will provide a snapshot of current products and trends from the dominant (high-end) sonar producers focused on survey-grade products. Trend #1 – Resolution The neverending trend of getting higher resolution sonar systems is battling the physics of acoustics. Over the past several years, the battle for best-in-class multibeam for medium water depth has been between the Teledyne RESON SeaBat 7125, the Kongsberg EM 2040/2040C and the R2Sonic Sonic 2024.... (read more)
2016-02-01 03:59:24

Geophysical Surveys in West Africa

Detailed marine geophysical surveys are considered a key element in the process of development and construction of new offshore ports and load-out facilities. Specifically, seismic data constitute an essential part as they can reveal many unknown factors. Due to the challenging environment in West Africa and the often very shallow water depths, it requires a flexible and versatile approach from a survey company. This article gives an overview of how this type of project is approached and some of the lessons we have learnt when performing marine geophysical surveys in shallow water in West Africa.<P> West Africa is rich inmineral... (read more)
2009-01-05 12:00:00

Mapping the Seafloor with Remote Sensing and Satellite Imagery

An Analysis of the Techniques and Benefits of These Methods
70% of the Earth is covered by water, but so far just 7% of it has been surveyed (Mars, Venus and the Moon are better surveyed). Hydrography as a science has changed dramatically since the first measurements were made by Alexander Dalrymple and James Cook with lead lines and sextants. Singlebeam echosounders were invented in the 1920s – a technology still used today for mapping the seafloor. This method of using echosounders can produce very high-resolution bathymetric data but the high operational costs and the slow working process make it economically unsuitable for covering large areas. However, with the ongoing expenses of... (read more)
2018-06-19 09:23:54

Hydrography for Offshore Exploration and Exploitation

Hydro international interviews Arne Indreeide
Hydrography began as an activity to collect data for chart production and safe navigation. With the start of offshore oil & gas exploration/exploitation and other civil engineering projects, hydrographic data also came to be of vital importance for another sort of user. A separate type of hydrography was seen to be developing; is there any similarity and/or interchange of knowledge and experience between the two? In our October 2004 issue we interviewed Admiral Maratos from the IHO on the matter. For the present issue, Arne Idreeide, Advisor to Statoil, Norway and former EAB member of HI, agreed to be interviewed... (read more)
2008-01-01 01:00:00

Maiden Voyage Surveyor Interceptor Moved ­Traditional Boundaries

Hydro International Interviews Ola Oskarsson
You have heard of a remotely operated vehicle (ROV), but you might not have heard of the SROV yet. The S stands for Surveyor, meaning that the SROV Surveyor Interceptor is the first ROV built solely for subsea surveys, such as pipeline inspections, seabed mapping and environmental mapping. Compared to the techniques used to date, the outcome of the SROV’s first survey in March 2015 was much higher resolution imagery and multibeam data in less than half of the time, a world first. Hydro International interviews Ola Oskarsson, founder of marine surveying company MMT and project manager for the Surveyor... (read more)
2015-07-28 02:24:16

Citizen Mapping and Charting (part 2)

How Crowdsourcing is Helping to Revolutionise Mapping & Charting
Part 1 of ‘Citizen Mapping and Charting' described the concept of crowdsourcing with examples. From here part 2 will focus on maps and charts. Everybody's a Map Maker The applications mentioned in Part 1 all make extensive use of spatial data and use map applications to display their results. Some (such as website 1 and the AIR (Area's Immediate Reading) project website 2) use graphical displays that most public institutions could only dream about - clearly a benefit from having one or two design students on your team of volunteers. The crowd makes extensive use of maps for display purposes... (read more)
2009-10-05 10:33:27

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

Offshore Windfarm Survey on Gunfleet Sands

In recent years an expansion in the telecommunications cable industry led to an increase in the market for cable route landfall surveys incorporating geophysical surveys at sea and topographic surveys of the landing site. In the last two years, however, the economic conditions in the telecommunications industry have been such that there has been a significant decline in the number of surveys being commissioned. Therefore, it was with great interest that the coastal survey industry in the United Kingdom followed the development of the offshore windfarm market. This was given a considerable boost by the announcement of significant UK government... (read more)
2008-01-01 01:00:00

From Data to Information

A Conceptual View of Data Integration as the Backbone of e-Navigation
The current discussion on e-Navigation focuses on the technical implementation of integrated data streams to increase situational awareness and optimise support for decision making in two key areas: The mariner in charge on the bridge of a vessel and the marine expert on shore, for example in a VTS centre. The real goal is to enable the bridge team to make the right decisions in preparation for their voyage. Data integration for improved situational awareness provides the key to success. As maritime transport becomes more complex, for example due to changes in ship size, increased traffic density and growing economic... (read more)
2012-05-02 04:28:35

Changes to Data Sourcing in Modern Times

The New Data Paradigm
Seaports, waterways and climate are inextricably linked. Weather anomalies change bottom contours and destroy aids to navigation, compromising safety. In the past decade maritime applications, maturing marine technologies and crowdsourcing have given mariners access to near-real-time hydrographic data. The 3D Forward-looking Sonar is one example of the technology navigators are using to create their own 3D local chart database. Thousands of vessel operators are now contributing to online navigation safety databases. This article provides examples of how traditional hydrographic data sourcing continues to change in the wake of apps, intra-vessel communication and 3D sonar hardware/software technology. Crowdsourcing Apps In the... (read more)
2017-02-14 01:47:22
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