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Surface Topography and Mixed-Pixel Effects on the Simulated L-Band Brightness Temperatures

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6 Author(s)
Talone, M. ; Univ. Politecnica de Catalunya, Barcelona ; Camps, A. ; Monerris, A. ; Vall-llossera, M.
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The impact of topography and mixed pixels on L-band radiometric observations over land needs to be quantified to improve the accuracy of soil moisture retrievals. For this purpose, a series of simulations has been performed with an improved version of the soil moisture and ocean salinity (SMOS) end-to-end performance simulator (SEPS). The brightness temperature generator of SEPS has been modified to include a 100-m-resolution land cover map and a 30-m-resolution digital elevation map of Catalonia (northeast of Spain). This high-resolution generator allows the assessment of the errors in soil moisture retrieval algorithms due to limited spatial resolution and provides a basis for the development of pixel disaggregation techniques. Variation of the local incidence angle, shadowing, and atmospheric effects (up- and downwelling radiation) due to surface topography has been analyzed. Results are compared to brightness temperatures that are computed under the assumption of an ellipsoidal Earth.

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:45 ,  Issue: 7 )