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Remote Sens. 2010, 2(5), 1273-1286; doi:10.3390/rs2051273
Article

Sensitivity Analysis of b-factor in Microwave Emission Model for Soil Moisture Retrieval: A Case Study for SMAP Mission

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Received: 10 February 2010; in revised form: 28 April 2010 / Accepted: 29 April 2010 / Published: 4 May 2010
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Abstract: Sensitivity analysis is critically needed to better understand the microwave emission model for soil moisture retrieval using passive microwave remote sensing data. The vegetation b-factor along with vegetation water content and surface characteristics has significant impact in model prediction. This study evaluates the sensitivity of the b-factor, which is function of vegetation type. The analysis is carried out using Passive and Active L and S-band airborne sensor (PALS) and measured field soil moisture from Southern Great Plains experiment (SGP99). The results show that the relative sensitivity of the b-factor is 86% in wet soil condition and 88% in high vegetated condition compared to the sensitivity of the soil moisture. Apparently, the b-factor is found to be more sensitive than the vegetation water content, surface roughness and surface temperature; therefore, the effect of the b-factor is fairly large to the microwave emission in certain conditions. Understanding the dependence of the b-factor on the soil and vegetation is important in studying the soil moisture retrieval algorithm, which can lead to potential improvements in model development for the Soil Moisture Active-Passive (SMAP) mission.
Keywords: soil moisture; passive microwave; L-band; b-factor soil moisture; passive microwave; L-band; b-factor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Seo, D.; Lakhankar, T.; Khanbilvardi, R. Sensitivity Analysis of b-factor in Microwave Emission Model for Soil Moisture Retrieval: A Case Study for SMAP Mission. Remote Sens. 2010, 2, 1273-1286.

AMA Style

Seo D, Lakhankar T, Khanbilvardi R. Sensitivity Analysis of b-factor in Microwave Emission Model for Soil Moisture Retrieval: A Case Study for SMAP Mission. Remote Sensing. 2010; 2(5):1273-1286.

Chicago/Turabian Style

Seo, Dugwon; Lakhankar, Tarendra; Khanbilvardi, Reza. 2010. "Sensitivity Analysis of b-factor in Microwave Emission Model for Soil Moisture Retrieval: A Case Study for SMAP Mission." Remote Sens. 2, no. 5: 1273-1286.


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