Passive L-band microwave soil moisture retrieval error arising from topography in otherwise uniform scenes |
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Authors: | Melody J. Sandells Ian. J. Davenport Robert. J. Gurney |
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Affiliation: | 1. Environmental Systems Science Centre, The University of Reading, Harry Pitt Building, 3 Earley Gate, Whiteknights, Reading RG6 6AL, UK |
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Abstract: | Soil moisture is an important component of the water cycle and will be measured for the first time on a global scale by a dedicated passive L-band microwave radiometer that is planned for launch in 2008. Here, the contribution of topography to the error budget is examined for a vegetated scene with uniform microwave emission. Dual-polarization brightness temperature curves were generated over a range of look angles for 1-D scenes with simple geometrical features, and the soil moisture was retrieved assuming a flat surface. The errors were small for the scenarios considered. Theoretical errors were tested for realistic topography with a DEM transect of a mountainous region, and were found to be comparable. Knowledge of the mean slope from high-resolution DEM data can be used to improve the accuracy of the retrieval. |
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Keywords: | Passive microwave Soil moisture Topography Vegetation SMOS Remote sensing |
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