Model-based Inversion of Soil Parameters under Vegetation using Ground-to-Volume Ratios

Konferenz: EUSAR 2010 - 8th European Conference on Synthetic Aperture Radar
07.06.2010 - 10.06.2010 in Aachen, Germany

Tagungsband: EUSAR 2010

Seiten: 4Sprache: EnglischTyp: PDF

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Jagdhuber, Thomas; Hajnsek, Irena (Microwaves and Radar Institute, German Aerospace Center (DLR), PO BOX 1116, 82234 Wessling, Germany)
Hajnsek, Irena (Institute of Environmental Engineering, ETH Zurich, Schafmattstr. 6, 8093 Zurich, Switzerland)

An innovative model-based inversion of soil moisture and soil roughness under vegetation cover is developed using polarimetric ratios from the X-Bragg model and the modified three component decomposition. Normalized ground-to-volume ratios are incorporated for a substantial improvement of the estimation for soil parameters by splitting the cross-polarized scattering component SXX into a roughness and a vegetation contribution. Results for soil moisture and soil roughness estimation under a variety of vegetation types covering the vegetation growth period are presented for the multi-temporal L-band data set of the AgriSAR campaign conducted in 2006. For the soil roughness and the soil moisture a root mean square error for all investigated dates and crop types of 0.1 and 6.7Vol.% is achieved. Despite the promising results for inversion of the soil parameters the standard deviation of the inversion estimates report a significant uncertainty, which has to be further investigated.