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Summary of Proposal LAN3176

TitleWetland monitoring using X- and C-band SAR data
Investigator Riedel, Tanja - Friedrich-Schiller-University, Institute of Geography / Earth Observation
Team Member
Dr. Roth, Achim - German Aerospace Center, Earth Observation Center
Mrs. Weise, Kathrin - Jena-Optronik GmbH, N/A
Prof. Dr. rer. nat. Schmullius, Christiane - Friedrich-Schiller-University, Institute of Geography, Earth Observation
SummaryThe overarching goal of the proposed project is the integration of X- and C-band SAR data into the satellite based monitoring of wetlands, of wetland threats and trends of wetlands ecological character. All work related to this AO-proposal will be done within the WetlandRadar project, funded by the DLR within the joint C/X Band Initiative of CSA & DLR (FKZ 50EE1511, FKZ 50EE1512). The project team will build upon the experiences and techniques of previous projects. TerraSAR-X,Radarsat-2 and Sentinel-1 data shall be used within this project. The SAR data preprocessing will be done by DFD applying a novel technique that is able to combine several SAR acquisitions (multitemporal) in arbitrary polarizations (multi-polarized) and even of different sensors (multifrequency). To demonstrate the potential of X- and C-band SAR data for the monitoring of wetlands seperability and time series analyses will be performed. LULC products with varying input SAR parameters will be generated and evaluated focusing on the value of X-band vs. C-band vs. combination of X-/C-band data, dual-pol. vs. full-pol datasets, backscatter intensities vs. polarimetric parameters and so on. Additionally, comparison of LULC products based on SAR data with optical LULC maps is planned in this context. One further objective of this study is the adaption and further development of the object-based approaches for the generation of reliable LULC maps developed within GW-II and the DLR/BMWi Enviland-2 project. For the basic land cover classes of the GW-II legend an automatic classification system is desired. Algorithm development is restricted to three test sites. The transferability of the proposed methodology will be demonstrated on base of the remaining three test sites. The final classification scheme will be implemented in the Geoclassifier Toolbox of JOP within this project. For the LULC classification the usage of dual-pol TerraSAR-X stripmap mode data is planned. The detection of water level changes is another very important parameter for the monitoring of wetlands and will be addressed in this proposal. Previous studies demonstrated the suitability of the InSAR technique for water level monitoring in wetlands.Within this proposal, X (HH-polarized stripmap mode) - and C-band differential phase differences will be exploited to map water level changes. A simultaneous usage of both frequencies is planned to further improve the results. The project results will be presented to the wetland user community to support the installation of an SAR-based wetland mapping service in future. A long-term outlook for the exploitation of the project results will be not just the installation of a common service but also the common distribution of the GEOclassifier Toolbox of JOP in the future.

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