Bathymetric Survey of Cebu Harbor

EGS (Asia) Ltd. has completed a detailed bathymetric survey in Cebu, the Philippines, on behalf of Cebu Port Authority (CPA). Work was completed over a 30 day period, starting on 25 January 2004. To cope with the steadily increasing marine traffic within the Cebu Harbour, CPA has commenced a study on the Cebu Integrated Port Development Plan. As part of master plan of the study, it is essential to carry out a detailed bathymetric survey to map the seabed in great details in order to: To update and upgrade existing charts To map areas where siltation appears to be taking... (read more)
2004-07-26 12:00:00

IMAR Acquires New Kongsberg Maritime Multi-beam Package

Imar Survey Limited has announced the acquisition of its latest suite of shallow and medium depth multi-beam echo sounder systems from Kongsberg Maritime. The new suite includes EM 3002 dual transducer head multi-beam system with Seafloor Information System, EM 1002 and EA 400 SBES. The EM 3002 is an advanced multi-beam echo sounder with extremely high resolution and dynamically focused beams. It is suited for detailed seafloor mapping and inspection with water depths between 0.5 and 150 meters. Due to its electronic pitch compensation system and roll stabilized beams, the system performance is stable even in foul weather conditions. Typical... (read more)
2005-08-12 12:00:00

Australasian Hydrographic Society

News The Deployable Geospatial Support Team (DGST), then called the Hydrographic Office Deployable Survey Unit, was originally created in the 1980s to conduct hydrographic surveying activities in Antarctica. The DGST as a small part of RAN hydrographic capability continues to evolve. It now conducts surveying tasks to meet other national charting requirements, in addition to military Rapid Environmental Assessment (REA) surveys, an activity which now places a Hydro/Metoc ship in an actual battle space as a tactical entity. The DGST is currently commanded, both in the field and at home base, by Lieutenant Commander D.G. Mullins, RAN. It is based... (read more)
2008-01-01 01:00:00

Sandwave Migration

Seabed mobility and shallow-water swathe sounding
The use of swathe systems in a highly mobile, shallow-water environment poses significant problems for the hydrographic surveyor. Several physical factors encountered when gathering swathe data are introduced and described as contributing to degradation of the accuracy model. The extent of influence by physical/environmental characteristics and the tidal solution on bathymetry must be understood so that methods to obtain accurate bathymetry suitable for safe navigation, seabed migration modelling and future research projects can be employed by the surveyor in real time. Lack of space prevents detailed discussion of such factors here, but this by no means reduces their importance, briefly... (read more)
2008-01-01 01:00:00

Gardline Hydro

Hydrographic surveys over the whole world
Gardline has been undertaking hydrographic surveys in the north west of Europe and all over the world since 1974. Large-area nautical charting surveys to UKHO standards have been regularly undertaken since 1982 in UK waters. During this time techniques and equipment have been continually improved and upgraded to meet the changing demands of the hydrographic user community. Gardline has significant experience with regional nautical charting surveys for the UK Government. The company has been particularly successful in fulfilling contracts in UK waters in 1982, 1983, 1984, 1985, 1988, 1990, 1994, 1996 - 2003, and the current 2004/05 contracts in the... (read more)
2008-01-01 01:00:00

Multi-beam Error Management

New data processing trends in hydrography
The hydrographic community has tumbled headlong into a data boom. Hundreds of single-beam soundings are now replaced by millions of high-resolution multi-beam swath soundings. This boom is not free from the problems inherent in how data is to be handled by ever-shrinking staff and ever-increasing demands for ways to store, process and archive gargantuan datasets. Luckily, modern computer hardware and processors can handle the load. However, there is still the issue of affording resources for traditional data processing, where each sounding is scrutinised. What new software approaches are being developed to automate processing? This article describes one new and innovative... (read more)
2008-01-01 01:00:00

We Visited for You

Technical Awareness Seminar 2003, South Africa
In early December 2003 the Hydrographic Society of South Africa held a four-day Technical Awareness Seminar (TAS) hosted by the Institute for Maritime Technology (IMT) in Simon’s Town, South Africa. The theme for the Seminar was ‘New Technologies for a New Century’. Over one hundred delegates from the Southern Africa region attended the TAS, providing a good representation of the regions Offshore Mining Companies, Oil & Gas Industry, South African Navy, Research Institutions, Educational Institutions and Local Marine Suppliers. Delegates generally registered for just one of the four days, as presentations and demonstrations were repeated every day. However, due to... (read more)
2008-01-01 01:00:00

Habitat Mapping - Increasing Importance

Two decades ago as CO of a survey ship, I interpreted the SSS-registrations (still on wet paper) twice. Once was for nautical charting purposes and the second, in my own time, was simply to ‘get the most from data collected at high costs’ (my hobbyhorse) when I made a bottom texture chart for those institutions interested. Since then, for various reasons e.g. a growing concern about the environment, more and more habitat studies are now conducted, ranging from baseline surveys to full-blown scientific studies. The multidisciplinary studies are mostly based on hydrographic charting specifications and data quality methods (which I... (read more)
2008-08-27 12:00:00

Energy for Remote Community

Swathe Services was recently commissioned by Falmouth Divers to assist on a 4km submarine power cable installation to a remote island community on behalf of one of their clients in Pembrokeshire, Wales, UK. Working from the Grey Bear, a landing craft type vessel provided by Falmouth Divers, Swathe Services conducted a heave-compensated singlebeam echo sounder (SBES) survey of the proposed cable route. The SBES data was processed on site and a Digital Terrain Model (DTM) of the cable route was produced. On selection of a route, tidal flow measurements were taken to allow the cable lay vessel to plan the... (read more)
2010-04-23 12:00:00

Technology in Focus: Multi-beam Echosounders

New Technology, New Capabilities and New Markets
The evolution of multi-beam echo sounders (MBES) is leading to systems with enhanced capabilities in their traditional markets, but also provides features to allow the expansion of their use into new areas and applications. This short review highlights some of the features of the latest generation of systems. The attributes of an MBES system are traditionally described by technical specifications, such as operating frequency, pulse length, beamwidth, number of beams and coverage. These technical parameters define the nature of the system, but the fundamental characteristics of greatest interest. By Dave Mann, Gardline Geosurvey, UK. Just as technological advances mean there... (read more)
2013-03-26 02:25:34
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