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Long-term Monitoring of water dynamics in the Sahel region using the Multi-SAR-System

Bertram, Adina und Wendleder, Anna und Schmitt, Andreas und Huber, Martin (2016) Long-term Monitoring of water dynamics in the Sahel region using the Multi-SAR-System. In: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, Seiten 9-16. ISPRS Congres, 2016-07-12 - 2016-07-19, Prag, Tschechien. doi: 10.5194/isprsarchives-XLI-B8-313-2016. ISSN 1682-1750.

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Kurzfassung

Fresh water is a scarce resource in the West-African Sahel region, seasonally influenced by droughts and floods. Particularly in terms of climate change, the importance of wetlands increases for flora, fauna, human population, agriculture, livestock and fishery. Hence, access to open water is a key factor. Long-term monitoring of water dynamics is of great importance, especially with regard to the spatio-temporal extend of wetlands and drylands. It can predict future trends and facilitate the development of adequate management strategies. Lake Tabalak, a Ramsar wetland of international importance, is one of the most significant ponds in Niger and a refuge for waterbirds. Nevertheless, human population growth increased the pressure on this ecosystem, which is now degrading for all uses. The main objective of the study is a long-term monitoring of the Lake Tabalak’s water dynamics to delineate permanent and seasonal water bodies, using weather- and daytime-independent multi-sensor and multi-temporal Synthetic Aperture Radar (SAR) data available for the study area. Data of the following sensors from 1993 until 2016 are used: Sentinel-1A, TerraSAR-X, ALOS PALSAR-1/2, Envisat ASAR, RADARSAT-1/2, and ERS-1/2. All SAR data are processed with the Multi-SAR-System, unifying the different characteristics of all above mentioned sensors in terms of geometric, radiometric and polarimetric resolution to a consistent format. The polarimetric representation in Kennaugh elements allows fusing single-polarized data acquired by older sensors with multi-polarized data acquired by current sensors. The TANH-normalization guarantees a consistent and therefore comparable description in a closed data range in terms of radiometry. The geometric aspect is solved by projecting all images to an earth-fixed coordinate system correcting the brightness by the help of the incidence angle. The elevation model used in the geocoding step is the novel global model produced by the TanDEM-X satellite mission. The advantage of the Multi-SAR-System is that it comprises ortho-rectification, radiometric enhancement, normalization and Kennaugh decomposition, independent from sensors, modes, polarizations or acquisition date of SAR data. In addition, optical satellite data can be included as well, to fill gaps where SAR data are missing due to the special normalization scheme. This kind of pre-processing is exclusively implemented at the Earth Observation Center of the German Aerospace Center in Oberpfaffenhofen, Germany. Therefore, the dynamic change of the open water of the Lake Tabalak could be classified over dry and rainy seasons and years, using different SAR data. The study provides a unique database and contributes to a better understanding of wetland systems in the Sahel region influenced by human pressure and climate change.

elib-URL des Eintrags:https://elib.dlr.de/148264/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Long-term Monitoring of water dynamics in the Sahel region using the Multi-SAR-System
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Bertram, AdinaAdina.Bertram (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wendleder, AnnaAnna.Wendleder (at) dlr.dehttps://orcid.org/0009-0005-1534-4732NICHT SPEZIFIZIERT
Schmitt, AndreasAndreas.Schmitt (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Huber, MartinMartin.Huber (at) dlr.dehttps://orcid.org/0000-0003-2665-2149NICHT SPEZIFIZIERT
Datum:2016
Erschienen in:International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.5194/isprsarchives-XLI-B8-313-2016
Seitenbereich:Seiten 9-16
ISSN:1682-1750
Status:veröffentlicht
Stichwörter:SAR, Geocoding, Kennaugh, Sahel Region, Water Dynamics, Long-term Monitoring
Veranstaltungstitel:ISPRS Congres
Veranstaltungsort:Prag, Tschechien
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:12 Juli 2016
Veranstaltungsende:19 Juli 2016
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 - TSX/TDX Missionsbetrieb, R - SAR-Methoden
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Dynamik der Landoberfläche
Deutsches Fernerkundungsdatenzentrum > Leitungsbereich DFD
Hinterlegt von: Bertram, Adina
Hinterlegt am:13 Jan 2022 12:12
Letzte Änderung:24 Apr 2024 20:46

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