HOME >> BIOLOGY >> NEWS
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
mariangela.dacunto@esa.int
39-069-418-0856
European Space Agency
22-Nov-2005


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:4/1/2015)... Apr. 1, 2015  NXT-ID, Inc. (NASDAQ: NXTD ... focused on the growing mobile commerce market, announces the ... wallets is underway to early access pre-order customers. ... usage at retail outlets including Walmart, Target, AT&T, Dunkin, ... Wocket was accepted at all outlets and very easy ...
(Date:3/26/2015)... , March 26, 2015 The ... social, recreation and athletic club, today announced it has ... allow freedom of movement for members and staff, while ... a comprehensive process, we selected FST,s IMID Access system ... convenience for our members and staff, in addition to ...
(Date:3/23/2015)... , March 23, 2015 SoundView Technology Group ... NXT-ID,s (NASDAQ: NXTD ) Wocket smart wallet. SoundView was one ... feedback on their experience with the Wocket in multiple scenarios ... CVS, Whole Foods and other retailers, making both debit and ... Tuttle also says, "If the company meets their plans ...
Breaking Biology News(10 mins):NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 2NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 3NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 4Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 3Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 4
(Date:4/16/2015)... 16, 2015 Regis Technologies looks forward ... for Cancer Research (AACR) annual meeting. Regis will exhibit ... starting Saturday, April 18, in Philadelphia and running through ... title of the oldest and largest organization focused on ... grants, and partners with survivors to promote awareness and ...
(Date:4/16/2015)... (PRWEB) April 16, 2015 The ... that the prestigious 2015 Borlaug CAST Communication Award ... member at Tuskegee University in Alabama. Award nominees ... material; public presentations; and/or the use of television, ... all three areas. As a specialist in the ...
(Date:4/16/2015)... 16, 2015  RegeneRx Biopharmaceuticals, Inc. (OTCQB: RGRX) ... joint venture with G-treeBNT (ReGenTree LLC) has retained ... trial for the orphan disorder, neurotrophic keratopathy (NK), ... eye syndrome (DES) in the U.S.  Both trials ... this year.  Each of these eye disorders was ...
(Date:4/16/2015)... A new infographic compiles useful information ... institutions to learn how Appleā€™s new framework can change ... is ideal since Apple made Research Kit ... open-source framework for developing medical research apps that Apple ... researchers to collect secure clinical data and communicate via ...
Breaking Biology Technology:Regis Technologies Joins American Association for Cancer Research Annual Meeting 2The 2015 Borlaug CAST Communication Award Goes to Channapatna Prakash 2RegeneRx JV Retains Ora, Inc. to Conduct Phase 3 Trial for NK and Phase 2b/3 Trial for Dry Eye Syndrome in U.S. 2RegeneRx JV Retains Ora, Inc. to Conduct Phase 3 Trial for NK and Phase 2b/3 Trial for Dry Eye Syndrome in U.S. 3RegeneRx JV Retains Ora, Inc. to Conduct Phase 3 Trial for NK and Phase 2b/3 Trial for Dry Eye Syndrome in U.S. 4RegeneRx JV Retains Ora, Inc. to Conduct Phase 3 Trial for NK and Phase 2b/3 Trial for Dry Eye Syndrome in U.S. 5Infographic Illustrates Potential for Research Kit to Impact Clinical Research 2Infographic Illustrates Potential for Research Kit to Impact Clinical Research 3
Cached News: