The Seabed Survey Data Model

An Industry Data Model for Managing Seabed Survey Data
Exploration and Production (E&P) companies spend millions of dollars every year undertaking seabed surveys to acquire data to help in many exploration and production activities such as: determining potential well locations, identifying geophysical hazards (geohazards), the selection of potential pipeline routes and offshore facility locations, and asset maintenance. E&P companies utilise hydrographic survey companies to collect, process and deliver seabed survey data to improve project planning and manage risk. However, to extract the true value from the acquired data there is a need to ensure consistency in how the data is structured and delivered so that it is more efficiently... (read more)
2011-09-08 02:24:40

STEMA Survey Services bv

New techniques to reveal crucial sub-bottom details
After working for eighteen years with the trailer department of a dredging company, Stef Mars started his own hydrographic survey company in 1985. Working on board of hopper trailer suction dredgers and later as hydrographic surveyor with project management he came across two main problems: a lack of reliable sub-bottom information, and the elusiveness of liquid sediment, or silt. Stema is known mostly as a hydrographic and geophysical survey company; it is less known as a manufacturer of software. However, we have developed our own tools that may be of interest to readers. The Company A team of geologists, hydrographers... (read more)
2008-01-01 01:00:00


A survey vessel for shallow waters
The survey vessel <i>Capella</i> was commissioned at the Federal Maritime and Hydrographic Agency of Germany (BSH) in January this year. <i>Capella</i> has been developed especially for navigation in shallow waters and is a valuable complement to the other four BSH survey vessels, any operatively economical hydrographic shallow area survey of the Wadden Sea, narrow coastal inlets and Baltic coastal lagoons having been unavailable up until then. Traditional deep-draught survey vessels can only anchor in deep water, far from the shallow areas to be surveyed, necessitating survey launches having to cover considerable distances to their destination. This article introduces a shallow-draught... (read more)
2008-01-01 01:00:00

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

Offshore Wind Farm Developments and Scouring Effects

One of the chief risks for offshore wind farm developments is that associated withscouraround the pile bases and along the length of the cable which carries power between monopiles and to the shore. Consideration of the scour risk early in a project can provide a basis for structural designs to be modified, and for the assessment of appropriate preventive (as opposed to remedial) measures. Underpinning and running concurrently with this planning stage is the collection of information and data inputs relevant to scour risk assessment.<P> The Marine Renewables Energy Sector is an emerging force in energy provision globally and recent... (read more)
2008-10-15 12:00:00

First Assembly of the International Hydrographic Organization (IHO)

People Pass, Institutions Remain
The first Assembly of the International Hydrographic Organization was held in the Auditorium Rainer III of Monaco, from 23 to 28 April 2017. I have entitled my report after a quotation by Jean Monnet, French politician and one of the European Community’s founders: Les hommes passent, les institutions demeurent. The director Gilles Bessero mentioned it in his farewell speech at the end of the Assembly. Jean Monnet’s sentence is perfectly applicable to the IHO, an organization founded in 1919 that has, since then, not stopped growing in number of Member States and continues to ensure that all the world's seas,... (read more)
2017-05-15 09:08:20

The Public-private Dilemma

Interview with Dr Cees Laban, marine project developer, Business Unit Geology, TNO
Privatisation as an answer to the financial challenges of survival has become a trend among public organisations, and hydrography is no exception. Private enterprise, worried about ‘unfair competition’, often looks with suspicion upon this. How are public-knowledge institutions currently organised and operating? Dr Cees Laban of the Geological Survey of The Netherlands agreed to be interviewed about his own organisation. Please outline for our readers how you as a geologist became involved in hydrography. From its inception, one of the main tasks of the Geological Survey of The Netherlands was mapping the subsoil of the Dutch land area. In 1968... (read more)
2008-01-01 01:00:00

Geosurvey Techniques in Offshore Diamond Mining

De Beers Marine routinely acquires ultra high-resolution geophysical data in support of its offshore mining and exploration programmes for diamondiferous placer deposits situated on the continental shelf off the West Coast of southern Africa. Geosurveys are conducted over a wide range of water depths, each with a unique geological seabed terrain and associated survey requirements. Detailed mapping of complex and varied geological terrain demands the use of leading-edge survey technology. To this end, we have for the past four years been routinely operating an AUV (Autonomous Underwater Vehicle) as our principal ultra-high resolution geophysical survey platform. The continental shelf off... (read more)
2008-01-01 01:00:00

ECDIS – Caveat Navigator

Is the Paperless Bridge a Hazard to Navigation?
Hydrographic data is at the core of ECDIS. The International Hydrographic Organization (IHO) is of the opinion that the quantity and coverage of good hydrographic data around the world is mostly unsatisfactory. Meanwhile, the overall hydrographic data acquisition capacity of its member States is declining. Is there a proper appreciation of the quality and reliability of the data behind the image displayed on the screen? Does the digital presentation of nautical charts give a false sense of security? The paper chart or Raster Navigational Chart (RNC) displays all safety critical navigational information at once. The Electronic Navigational Chart (ENC) is... (read more)
2012-07-26 02:51:48

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
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