3D Web-Mapping

Integrating Marine Data into NASA World Wind
While Google Earth is the best known 3D web-mapping viewer currently in the public domain, there are alternative virtual globe viewers available. In particular, this article focuses on the NASA World Wind viewer, using OGC data-dissemination standards and multi-beam sonar data from the Irish National Seabed Survey to illustrate its potential. The creation of a range of innovative GIS tools and systems is enabling the harmonisation and electronic sharing of geospatial data and services across distributed networks. 3D web mapping viewers, such as NASA World Wind, are perhaps some of the most visible of these products. OGC Standards Such developments... (read more)
2008-01-01 01:00:00

AUVs in Hydrography

Integrating Autonomous Underwater Vehicle Capability into Hydrographic Operations
The US Navy and the Naval Oceanographic Office (NAVOCEANO) are committed to realising the vision that Autonomous Underwater Vehicles (AUVs) are available, affordable, and can play a critical role for many applications. Working in partnership with NAVOCEANO and the Office of Naval Research, the Remote Environmental Monitoring UnitS (REMUS) was developed at Woods Hole Oceanographic Institution and has improved positional accuracy due to newly developed technology. NAVOCEANO recently procured a REMUS 600 with a commercial shallow-water multibeam system onboard that meets the stringent accuracy requirements for hydrographic applications. NAVOCEANO hydrographic survey missions can now be augmented by LBS-AUV operations. However,... (read more)
2016-07-26 11:41:02

Different Approach to Surveying Antarctica

Operation Rock Bottom
Navigation data is poorly available in Antarctica. If navigational data is available it often dates back to the early 1900s with many lead line surveys. An initiative was undertaken by Stephen Wilkins of Xplore Expeditions to collect bathymetry with a multi-beam survey system making use of the sailing vessel Xplore. Together with Yoann Boulaire from SHOM, France and Fernando Landeta, hydrographic technician from Skyring Marine Chile, an IHO qualified survey was performed in Antarctica on an expedition sailing yacht. As all mariners navigating in Antarctica know , one must use a combination of all available means to enable safe travel... (read more)
2013-05-22 04:59:22

Satellite Observations to Retrieve Tidal Sea Level and Tidal Currents

Prediction of tides is important for many things, including safe navigation, coastal engineering and surveying. To determine tidal constituents, a sea level time series from a tide gauge can be used. Satellite altimeters are able to measure sea level differences. These measurements have been used to describe the large-scale tides in the open ocean. This article describes a technique for obtaining tidal information in coastal areas by combining satellite data with in situ measurements.<P> Tides are responsible for a large part of the movement of water in oceans and seas. The ability to predict tides is important not only for... (read more)
2008-04-02 12:00:00

Qatar Petroleum

The single buoy mooring (SBM) digital radio shutdown system is the latest ‘state-of-the-art’ digital radio communication system/network, consisting of a fixed radio base station installation at Halul Island (State of Qatar). It operates with a mix of handheld, mobile and fixed mobile radio units provided to authorised personnel for the berthing of oil tankers prior to oil loading operations at SBM-1 and SBM-2 buoys.<P> The main purpose of thissystem is two-way reliable voice communication. A second purpose is to enable authorised personnel to remotely shutdown the turbine oil pump facilities for safety reasons, should an emergency occur during oil loading... (read more)
2008-04-02 12:00:00

A Triptych on Standards of Competence

The current status of hydrography is relatively new and one of the consequences is an ongoing search for appropriate standards of competence for personnel involved. It is not possible to lay down a single uniform set of standards as a strong relationship exists between standards and type/nature of activity. Hydro international interviewed three representatives of segments within hydrography, each with a differing approach to standards of competence. These views cover general hydrographic education, training and experience of offshore contract personnel and the outlook of a company providing such personnel. Svante Astermo, FIG/IHO/ICA Advisory Board on Standards of Competence for Hydrographic... (read more)
2008-01-01 01:00:00

GIB Portable Tracking Systems

The underwater use of GPS
Why has a new positioning system been designed? What are the requirements? What are the drawbacks of traditional solutions? Why are a new concept and system architecture necessary? What applications are addressed? What performances can be achieved? In the field of underwater positioning, many solutions exist and people are often satisfied with the traditional solutions they are used to. LBL and USBL are widely used for underwater positioning in various applications, though they present some installation and calibration constraints and operational limitations. Their performance can be over estimated and in some cases are not justified. If you push surveyors towards... (read more)
2008-01-01 01:00:00

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

Computer-aided Paper Chart Production in Japan

‘Was all of this produced with the computer system?’
The Japan Hydrographic Department began developing a computer-aided production process about twenty years ago, but this proved difficult due to limitations in computer technology. Subsequent progress in this area has helped development of a computer-aided chart compilation method, resulting in unimagined improvements in efficiency. This article describes events of the past twenty years. Because of their indispensability for maritime navigation it is important that navigational charts be produced within as short a time period as possible and that their contents be constantly updated with the latest information. Despite this, the fact of most chart production processes being carried out by... (read more)
2008-01-01 01:00:00

3D Web-mapping

Integrating Marine Data into Google Earth
Google Earth has become a popular 3D web-mapping viewer, mainly due to the richness of satellite imagery in its primary database. However, the database contains very limited marine data. While the addition of marine data would be welcome, this article explores the use of Web Map Service (WMS) and Keyhole Markup Language (KML) to overlay large-scale multi-beam imagery datasets from the Irish National Seabed Survey into the Google Earth viewer. Over the last seven years the Irish National Seabed Survey (INSS) has returned many terabytes of multi-beam sonar and ancillary data, providing detailed bathymetry data and knowledge of seabed characteristics.... (read more)
2008-01-01 01:00:00
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