Before and After Satellite Imagery

The impact of the catastrophic tsunami that inundated the coast of Japan in the aftermath of the 11th March earthquake is plain to see on comparison satellite images made before and after the disaster. The images, mostly being sourced from Google Earth and using imagery from various providers, are displayed in several ways such as a slideshow where the recent images are following the older ones and images containing a slider dividing the old and new situation, making the comparison interactive.   (read more)
2011-03-14 10:31:55

Satellite-based Radar Imagery in Europe

From 21 to 25 January 2008, the 2nd International SAR oceanography workshop SEASAR-2008 was held in the ERS research institute ESRIN of the European Space Agency on the perspectives of SAR imagery of oceans from space. The workshop was attended by 150 participants from 25 countries from Europe, America and Asia, including Russia - from international Nansen Center (St. Petersburg), ScanEx R&D Center and Space Research Institute of Russian Academy of Sciences.   ESA Director of Earth Observation (D/EOP) Volker Liebig opened the workshop, announcing that Europe plans to put into orbit 16 new different Earth observation satellites within the... (read more)
2008-02-11 11:00:15

Satellite Imagery Optimising Northern Route Passenger Ferry

Russian ice-breakers using satellite images are escorting ferry boat Georg Ots through the Northern Sea Route. She is designed for navigation through ice and became the first passenger boat in the history that passed through the waters of the Arctic seas from Murmansk to the Dezhnev Strait and further on along the eastern borders of Russia. It is expected that the passenger ferry boat will arrive to the port of Vladivostok on 10th October.   FSUE Atomflot, guiding the ferry boat and handling the Russian nuclear-powered ice-breaker fleet, used radar images to assess the ice satiation and to choose the... (read more)
2010-10-04 02:19:49

Satellite Imagery in Aid of Typhoon Cleanup Operation

The United Kingdom Hydrographic Office (UKHO) is providing satellite images to help with the cleanup operation following typhoon Haiyan. A request came from the Royal Navy warship, HMS Daring, for high-resolution satellite images to help identify the areas worst hit by the 235mph winds and 20ft waves that devastated the Philippines earlier this month. The images will show whether there has been any significant changes to the sea after typhoon Haiyan struck. This will assist the vessel in safely navigating the waters whilst on its humanitarian relief deployment. Satellite images have also been sent to the Philippines Hydrographic Office for... (read more)
2013-11-26 02:30:58

Fugro Expands Survey Services and Satellite Imagery Capabilities

Fugro has extended its integrated survey services to help improve efficiency in coastal management and enable more informed decision making. A new agreement with global specialist EOMAP enables the creation of integrated bathymetric survey products that comprise elements from Satellite Derived Bathymetry (SDB), Airborne Lidar Bathymetry (ALB) and traditional acoustic survey technologies. The integrated data and product solutions will provide clients with outstanding value and unmatched coverage. According to hydrogrpahic business development manager Don Ventura, teaming with EOMAP augments Fugro’s survey and satellite imagery capabilities and will allow a timely and cost-effective nearshore bathymetry review facility for clients whose own... (read more)
2015-08-14 08:45:00

Hydrographic Use of Satellite Imagery in South Pacific

The French Hydrographic Office (SHOM) uses remotely sensed visible imagery for the cartography of atolls and reefs. It is considered as an efficient and relatively inexpensive method to collect information where data is sparse. Remotely sensed visible imagery is used in Pacific French Overseas territories for the cartography of atolls, reefs et cetera. All shallow-water areas may be involved, in particular when the cost of usual hydrography would be out of proportion with maritime traffic. Remotely sensed imagery is mixed with all field information available (bathymetry, buoys, seamarks) and a ‘spatiocarte’ (spatio-chart) is produced, which provides information on: Land: coastline,... (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

Satellite Positioning

Within the last twenty years Global Positioning System (GPS) receivers have revolutionised navigation. Integrated devices are capable of providing time, position, height, direction, heave and attitude to accuracies of a few nanoseconds time, 1cm position or 0.01 degree heading. All potentially displayed on a digital chart background with radar and auto-identification system overlays. In this first of two articles we look at current Satellite Positioning systems, how they work and how we can make them better. In a second article, to appear next month, we explore the future development of Satellite Positioning and the implications for navigation. How does Satellite... (read more)
2008-01-01 01:00:00

Satellite Navigation

Over the last twenty years Global Positioning System (GPS) receivers have revolutionised navigation. Integrated devices are capable of providing time, position, height, direction, heave and attitude, to accuracy of a few nanoseconds time, 1cm position or 0.01-degree heading. This article explores the future development and implications of Satellite Positioning. Satellite Positioning dominates navigation at sea, in the air and on land and is now available in our cell phones and wristwatches. How it currently works was explored in the October 2006 issue of Hydro international in an article titled ‘Satellite Positioning’ (pp 35-39). But how will it work in the... (read more)
2007-01-12 12:00:00

Imagery-derived Bathymetry Validated

Imagery-derived Bathymetry Validated Dear Sir, I was startled by an article in the January/February 2013 issue entitled ‘Imagery-derived Bathymetry and Seabed ­Classification Validated’, which took me back to 25 years ago when I was busy validating our first official satellite chart following the launch of SPOT 1. Our ground survey had been preceded even earlier by a push-broom scanner simulation performed with a Navy P2 aircraft. What disturbs me in this remarkable display of hydrographic excellence is that the authors are attempting to cajole readers into thinking that Satellite Derived Bathymetry (SDB) is a revolution, whilst it has been in... (read more)
2013-04-02 03:09:03
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