Related Research Areas
Water & Energy Cycles

Three areas of PI expertise for the SMAP Science Definition Team (SDT) are described: a primary focus on radio frequency interference (RFI) issues as well as physical modeling capabilities for the soil moisture and freeze/thaw algorithms and interfacing with related PALSAR investigations. RFI is one of the major risk factors identified for SMAP, and could severely limit soil moisture retrievals from the microwave radiometer. The PI has been leading NASA sponsored studies of RFI mitigation since 2002, including participation in two IIP projects and a current Airborne Instrument Transition project. Capabilities for the SDT include expertise in all RFI mitigation technologies proposed for Earth sensing, prediction of the expected performance of such techniques, datasets from several field campaigns that provide information on the RFI environment, and participation in an expected PALS soil moisture airborne campaign in Fall 2008. These capabilities will be utilized to provide objective assessment of RFI risk and to support RFI considerations in SMAP science and sensor requirements analyses. Although it is expected that empirical retrieval algorithms will be utilized for the radar and radiometer soil moisture and freeze thaw products, physically-based models of electromagnetic effects remain useful for guiding the development of and interpreting the results of such models. The PI has extensive experience in the theory of scattering and emission from soil surfaces as well as vegetation and Faraday rotation issues, and will utilize this expertise to support the SMAP retrieval algorithm team. L-band SAR systems can provide valuable empirical information on radar soil moisture and freeze/thaw retrieval techniques. The PALSAR sensor of JAXA has already acquired a useful dataset, and retrieval analyses are beginning to be reported. It is proposed to serve as an interface to related PALSAR research and to augment such studies as required by the SDT.

Project PI: Joel Johnson/The Ohio State University

The ElectroScience Laboratory Rm.221 The Ohio State University 1320 Kinnear Rd. Columbus, OH 43212

Phone: (614) 292-159

Fax: (614) 292-7297



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Started: Aug 10, 2010

Last Activity: Dec 16, 2010


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