elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Datenschutz | Kontakt | English
Schriftgröße: [-] Text [+]

Capability of ASCAT and ASAR, C-band active microwave sensors, for monitoring of extreme flood and drought events in lower Mekong countries

Naeimi, Vahid und Leinenkugel, Patrick und Frey, Corinne und Künzer, Claudia und Dech, Stefan (2012) Capability of ASCAT and ASAR, C-band active microwave sensors, for monitoring of extreme flood and drought events in lower Mekong countries. ISPRS 2012, XXII International Society for Photogrammetry & Remote Sensing, 2012-08-25 - 2012-09-01, Melbourne.

Dieses Archiv kann nicht den Volltext zur Verfügung stellen.

Offizielle URL: http://www.isprs2012.org/abstract/1384.asp

Kurzfassung

The Mekong River is the longest river in Southeast Asia with a drainage basin of 795,000 km². It rises in the Tibetan highlands and flows through six states, the southeast Chinese province of Yun-Nan, Myanmar, Laos, Thailand, Cambodia and Vietnam. The climate of the Mekong region is influenced by the Southwest and Northeast monsoons. The strong seasonal variation in rainfall leads frequently to extreme flood and drought conditions. Occurrences of large-scale and long-lasting floods alternating with periods of drought and water shortage significantly affect the people living in Mekong watershed and cause severe economic and civil damages. Therefore accurate information on the frequency and the extent of extreme events is critical for preparedness, prevention and management of the disaster. Satellite remote sensing has become valuable for monitoring surface parameters related to floods and droughts by providing comprehensive and multi temporal coverage of large areas. The active microwave sensors have proven to be applicable instruments for monitoring of surface water and soil moisture due to high sensitivity of radar signal to water. One of the major advantages of active sensors is that they can acquire imagery regardless of solar illumination during day and night and unimpeded by cloud cover, with the latter being of special importance during rainy periods, when wetlands are often easier to discriminate but mostly clouded. In this study we use the backscatter and soil moisture information extracted from the C-band Advanced SCATterometer (ASCAT) onboard Metop and the Advanced Synthetic Aperture Radar (ASAR) onboard Envisat to demonstrate the capability of active sensors for monitoring flood and drought events in lower Mekong region. The method is based on anomaly detection and threshold analysis of backscatter and its relative noise for detection of extreme dry, wet and inundated conditions. It is shown that the analysis of ASCAT backscatter noise helps to remove ambiguities in low backscatter domain for discrimination between extremely dry soil and inundated surface. The results show the potential of active sensors for change detection of surface water bodies and monitoring of soil moisture dynamics in the Mekong region which has applications in agriculture, hydrology, and disaster management.

elib-URL des Eintrags:https://elib.dlr.de/78027/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Capability of ASCAT and ASAR, C-band active microwave sensors, for monitoring of extreme flood and drought events in lower Mekong countries
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Naeimi, Vahidvahid.naeimi (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Leinenkugel, PatrickPatrick.Leinenkugel (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Frey, Corinnecorinne.frey (at) dlr.dehttps://orcid.org/0000-0002-9879-9732NICHT SPEZIFIZIERT
Künzer, ClaudiaClaudia.Kuenzer (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Dech, StefanStefan.Dech (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2012
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:ASCAT, ASAR, flood, drought, Mekong
Veranstaltungstitel:ISPRS 2012, XXII International Society for Photogrammetry & Remote Sensing
Veranstaltungsort:Melbourne
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:25 August 2012
Veranstaltungsende:1 September 2012
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Fernerkundung der Landoberfläche (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Landoberfläche
Hinterlegt von: Naeimi, Dr.techn. Vahid
Hinterlegt am:06 Nov 2012 11:35
Letzte Änderung:24 Apr 2024 19:44

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Gestaltung Webseite und Datenbank: Copyright © Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.