Dragon over water: Envisat monitors China's largest lake, rivers flooding

Envisat ASAR Global Monitoring Mode rapid-revisit images employed as part of ESA's Dragon Programme have charted the hydrological cycle of China's largest freshwater body, Poyang Lake, whose area fluctuates more than threefold annually.

Poyang Lake is situated in Jiangxi Province, around 50 kilometres north of the city of Nanchang. The Lake's basin is one of the People's Republic of China's most important rice-producing regions, but local inhabitants must contend with massive seasonal changes in water level, topped by regular severe floods.

Poyang Lake is connected to the Yangtze (Chiang Jiang) River through a narrow channel. In the dry season of a normal year, the area of the Lake shrinks to less than 1000 square kilometres, but by the end of the rainy season its size can grow up to 3500 square kilometres.

Improved understanding of Poyang Lake's annual dynamic could help with flood mitigation as well as improved ecological characterisation of the surrounding landscape. Accordingly a radar sensor aboard Envisat was used to regularly monitor the Lake during 2004 to 2005.

Envisat's Advanced Synthetic Aperture Radar (ASAR) instrument records the signal reflectivity of the Earth's land, sea and ice surfaces, and works on even through clouds, rain or local darkness. ASAR functions in various different modes Global Monitoring Mode (GMM) data being acquired continuously over the land as part of the satellite's background mission.

GMM images have a comparatively low spatial resolution of one kilometre, but with a swath of 400 kilometres they have very wide coverage and a frequent revisit time, useful for tracking dynamic features.

Up until now GMM has mainly been utilised for monitoring icebergs but Strasbourg-based rapid mapping specialists SERTIT began investigation of its potential for following seasonal water level changes on Poyang Lake as part of the Flood Rapid Mapping element of the Dragon Programme, a joint und

Contact: Mariangela D'Acunto
European Space Agency

Page: 1 2 3 4

Related biology news :

1. Dragonflys metabolic disease provides clues about human obesity
2. Dragon Symposium highlights success of projects
3. Dragonfly migration resembles that of birds, scientists say
4. Software tool helps protect Nations drinking water: Now available in all 50 states
5. Envisat captures first image of Sargassum from space
6. Envisat Symposium 2007 kicks off in Switzerland
7. Scientists meet to review Envisat results after 5 years of operations
8. Danish expedition ship tracked by Envisat satellite
9. Envisat radar surveillance protects endangered prehistoric fish
10. MERIS/AATSR Workshop: Focus on Envisat sensors measuring heat and light
11. Spanish forest fire aftermath surveyed by Envisat

Post Your Comments:

(Date:10/12/2015)... Hoyos Labs , ... will introduce its new biometric four-finger (4F) ... providing an unprecedented level of security / ... new biometric standard for secure transactions (BOPS). ... financial services to healthcare are implementing Hoyos, ...
(Date:10/8/2015)... 8. Oktober 2015 Die Track ... Unternehmen des Bereiches Tracking, hat heute bekannt ... Gefängnisbehörde Virginias (Department of Corrections – DOC) ... für alle Strafen geliefert werden, die der ... Präsident für den Amerikanischen Kontinent der Track ...
(Date:10/6/2015)... MATEO, Calif. , Oct. 6, 2015 /PRNewswire/ ... company, today announced enhancements to its software portfolio ... expression analysis kit for differential expression in eukaryotes. ... Platform, which is a cloud-based genomic analysis solution ... advance scientific discovery from next-generation sequencing efforts. ...
Breaking Biology News(10 mins):
(Date:10/12/2015)... cell surface marker detection market ... to a new report by Grand View Research, Inc. This ... of oncology diseases and other cell-associated disorders. --> ... USD 6.49 billion by 2022, according to a new report ... be attributed to rise in incidence of oncology diseases and ...
(Date:10/12/2015)... /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS) (TSX: AEZ) ... and commercializing novel treatments in oncology, endocrinology and women,s ... , the Company,s former Senior Vice President, Chief Financial ... Quebec City office.  David ... of the Company commented, "After a comprehensive review, the ...
(Date:10/12/2015)... -- LabStyle Innovations Corp. (OTCQB: DRIO), ... its Medical Director, Dr. Moshe Kamar , will ... EAI International Conference on Wireless Mobile Communication and Healthcare ... and wireless technologies," the conference will take place in ... - 16, 2015. The conference is endorsed and organized ...
(Date:10/12/2015)... , Oct. 12, 2015 VolitionRx Limited ... completed clinical study of its NuQ ® blood-based test ... online issue of Clinical Epigenetics , the official journal ... in collaboration with Lund University, ... , MD, PhD, Professor of Surgery and Vice-Dean, Faculty of ...
Breaking Biology Technology:
Cached News: