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United States Department of Agriculture

Agricultural Research Service


item Lakshmi, Venkat
item Jackson, Thomas
item Njoku, Eni
item Bolten, John
item Guijarro, L

Submitted to: American Geophysical Union
Publication Type: Abstract Only
Publication Acceptance Date: 12/16/2005
Publication Date: 12/18/2005
Citation: Lakshmi, V., Jackson, T.J., Njoku, E.G., Bolten, J.D., Guijarro, L.N. 2005. Validation of AMSR-Derived soil moisture: Lessons from SMEX02, SMEX03 and SMEX04 [abstract]. EOS Transactions, American Geophysical Union. 86(52) Fall Meeting Supplements, Abstract H23H-04.

Interpretive Summary:

Technical Abstract: The Advanced Microwave Scanning Radiometer has provided us with multi-channel data from mid 2002 to present. Numerous field campaigns have been conducted to carry out simultaneous measurements of soil moisture on the ground and by using aircraft-borne radiometers. These experiments have been carried out in three differing hydro-climatic regimes and land cover. Soil Moisture Experiment (SMEX) 2002 (SMEX02) was conducted in the Walnut river watershed in Iowa with predominantly corn and soyabean canopy. SMEX03 was conducted in the humid and highly vegetated region of Little River Georgia and SMEX04 was carried out in Walnut Gulch Arizona and Sonoran region in Mexico. In this paper we compare the soil moisture collected in-situ with the standard AMSR products. We also use the collected in-situ data such as soil moisture, surface temperature, vegetation water content, surface roughness and bulk density to input into a radiative transfer model to simulate the brightness temperatures at the satellite and aircraft radiometer for comparison. Insights into the forward problem will help us in the retrieval process. The comparisons from the three sites are analyzed and compared with each other to see if there is a correlation between the hydro-climatic regimes and land cover and the results.

Last Modified: 06/23/2017
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