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Exploiting longer wavelength SAR data for the improvement of surface modelling

Löw, Alexander und Hajnsek, Irena und Hoekman, Dirk (2008) Exploiting longer wavelength SAR data for the improvement of surface modelling. Projektbericht. 19569-06-NL-HE, 305 S. ESA-ESTEC.

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Kurzfassung

Accurate land surface process modelling might be limited due to lack of reliable model input data. Key surface variables as land cover information or soil moisture conditions have been proven to be observable by remote sensing systems. The integration of remote sensing data into land surface process models might therefore help to improve their simulations skills. Longer wavelength microwave data has a higher sensitivity to soil moisture content than higher frequency systems. Recent (ALOS) and planed (e.g. SMOS, TerraSAR-L) systems are therefore expected to provide valuable information about soil moisture dynamics. However the impact of integrating remote sensing data into process models will depend on the parameters that can be observed and their sensitivity to the model predictions on the one hand side and on the uncertainty of these retrievals on the other hand. The latter depends on the sensor configuration and retrieval methodology. Data assimilation techniques have become a favourable tool to integrate uncertain observations into models and use them to constrain the model predictions. The present study investigates the potential to retrieve land cover information and geophysical parameters from L-band SAR data. New techniques for the inversion of land surface parameters from L-band SAR data are developed and used to retrieve surface soil moisture information based on a multitemporal SAR image database collected throughout the ESA AGRISAR campaign. Different supervised and unsupervised land cover mapping techniques are developed. The potentials and limits to integrate remote sensing products into a state-of-the-art land surface model is beeing assessed and the merit of the remote sensing data for hydrological modelling is quantified.

Dokumentart:Berichtsreihe (Projektbericht)
Titel:Exploiting longer wavelength SAR data for the improvement of surface modelling
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Löw, AlexanderLudwig Maxilillians Universität
Hajnsek, IrenaNICHT SPEZIFIZIERT
Hoekman, DirkUniversity of Wageningen
Datum:April 2008
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:1
Seitenanzahl:305
Verlag:ESA-ESTEC
Name der Reihe:Final Report
Status:veröffentlicht
Stichwörter:soil moisture estimation, agrisar, svat model
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Prosmart, Smart-SAR (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > Radarkonzepte
Institut für Hochfrequenztechnik und Radarsysteme
Hinterlegt von: Dr.rer.nat. Irena Hajnsek
Hinterlegt am:16 Dez 2008
Letzte Änderung:27 Apr 2009 15:37

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