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

Precise RTK GPS Water Levels

Incline plane models in geoid-ellipsoid separation calibration
As more people adopt RTK GPS technology for measuring water levels, the issue of ellipsoid-geoid separation is increasingly being discussed. This article outlines various projects undertaken to calibrate this separation, and presents information to consider when using RTK GPS for measuring relative to an orthometric (geoid) datum. RTK GPS is increasingly being used for measuring water-level corrections during hydrographic survey, as for water levels in general. Measuring this third vertical dimension usually requires local site calibration to correct for separation between WGS84 ellipsoidal height and geoidal elevation, enabling conversion of WGS84 heights to orthometric heights such as mean seal level... (read more)
2008-01-01 01:00:00

Centralised Data for Hamburg Port Authority

From Ping to Chart
The Port of Hamburg is the third-largest container port in Europe and among the biggest in the world. There are almost 300 berths with a total of 43 kilometres of quay servicing around 9,000 ships per year. The Hamburg Port Authority (HPA) is responsible for the management of the harbour and has its own hydrographic survey department. This department collects its own multibeam and laser data which is augmented with additional data collected by the land survey department of the HPA and with data from external organisations. All bathymetric data is stored in a central Bathymetric Database (BDB) and from there disseminated... (read more)
2017-06-13 02:19:51

Oceans of Colour

Connecting Past and Present
Natural water colour measurements are based on multi- and hyper-spectral measurements performed in the field and from space. A simpler approach to determine the colour of natural waters is by means of the Forel-Ule colour comparator scale. This scale has been applied globally and extensively by oceanographers and limnologists since the 19th century. Colour classification according to the Forel-Ule method, through participatory science, i.e. with the help of the public, as developed within the EU project Citizens’ Observatory for Coast and Ocean Optical Monitoring (Citclops), will facilitate this need by connecting the present and the past. What Gives Colour to... (read more)
2015-05-29 11:14:45

Seamless Multibeam Data Analysis and Management

Seamless handling of large multibeam datasets
How to tackle problems traditionally associated with the management of multibeam data? A management tool has been developed which offers concrete operative solutions by eliminating lengthy manual editing stages and considering the entirety of survey swaths as a single dataset whilst maintaining control of each single sounding. The revolution created by the introduction of remote sensing in ways of perceiving, studying, interpreting, representing and operating in a land environment has been mirrored in the marine, river and lake environment by the introduction of multibeam soundings. There is an important difference between the two technologies: systematic checking on the grounds of... (read more)
2008-01-01 01:00:00

The ISO Standard for the ECS Database

ISO 19379
The Electronic Chart situation has developed in an unexpected way. When the first standards for chart systems were being written, the concentration was on those installations which would become the legal equivalent of a paper nautical chart. IMO produced a Performance Standard for ECDIS, and IHO prepared a companion standard for the ECDIS display; both were intended to define systems that would replace paper charts on board SOLAS vessels. IEC then produced a test standard to demonstrate compliance with these standards. All of these were completed in the late 1990s, and one would expect that by 2002 the world's shipping... (read more)
2008-01-01 01:00:00

Research-driven Tools for Ocean Mappers

Fighting Repetitive, Manual and Error-prone Routines the Smart Way
Current technologies can help ocean mappers and cartographers to fight repetitive, manual and error-prone routines the smart way. In a world where artificial intelligence is playing a key role in everyday life, it is disappointing when the everyday routines of an ocean mapper or cartographer involve solutions that are crudely manual, repetitive and error prone. Although the root causes of this situation might be debatable (e.g., constraints from abstruse formats, obscure algorithms, obsolete specifications, or a combination thereof), the advantages to the ocean mapping community of catching up with current-era technologies and moving towards smarter and more automated solutions are... (read more)
2017-10-25 12:39:35

Effective Surveying Tool for Shallow-water Zones

Satellite-derived Bathymetry
A recent article provides an overview of satellite-derived bathymetry methods and how data can be integrated into survey campaigns, and showcases three use cases. Bathymetric data in shallow-water zones is of increasing importance to support various applications such as safety of navigation, reconnaissance surveys, coastal zone management or hydrodynamic modelling. A gap was identified between data demand, costs and the ability to map with ship and airborne sensors. This has led to the rise of a new tool to map shallow-water bathymetry using multispectral satellite image data, widely known as satellite-derived bathymetry (SDB). Strictly speaking, the methods to derive information... (read more)
2017-01-04 04:13:14

The International Polar Year

Opportunities for Ocean Mapping at the Ends of the Earth
Bathymetric mapping remains incomplete in the Arctic and Southern Oceans. Some proposed International Polar Year activities could help improve the situation by collecting new soundings during vessel transits to and from their operating areas, and by making their observations available for inclusion in existing international databases Introduction The Arctic and Southern Oceans present significant challenges to marine scientists whose investigations require detailed maps of the seabed. For example, physical oceanographers need fine-scale portrayals of seafloor roughness and topography, to understand and predict the transport of water through deep, intermediate and shallow regions. Benthic ecologists need to know the detailed morphology... (read more)
2007-04-04 12:00:00

Trends in Hydrography

Taking Lessons from Today's Technical Developments
It’s often a cliché to say that everything offshore has changed since the introduction of GPS, but there have certainly been many changes since back then in the 1980s. The other obvious transformational technology has been computers and computer processing that, like the rest of the world, has totally and radically changed our lives. It didn’t happen immediately of course – no, that would never do in the ultra conservative environment of hydrography and offshore surveying. However, it’s clear when comparing mid-20th century surveying with today that they have totally and fundamentally impacted our projects. Nowadays, such technologies are often taken... (read more)
2016-12-06 02:02:15
Search Filter