Retrieval of Soil Moisture and Vegetation Water Content From Passive Microwave Remote Sensing: A Local-Scale Evaluation via Ground-Based Multichannel Radiometry
文献类型: 外文期刊
作者: Ma, Chunfeng;Li, Xin;Wang, Shuguo;Zhang, Yang;Liu, Xiaoyang;Hu, Yanxing;Dai, Liyun;Jin, Rui;Wang, Zengyan;Che, Tao
作者机构:
关键词: Microwave radiometry;Microwave measurement;Estimation;Vegetation mapping;Radiometers;Satellite broadcasting;Machine learning algorithms;Accuracy;Temperature measurement;Passive microwave remote sensing;Forward modeling;passive microwave remote sensing;soil moisture (SM) retrieval;variable channel algorithms
期刊名称: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
ISSN: 0196-2892
年卷期: 2025 年 63 卷
页码:
收录情况: SCIE(2025版) ; ; EI(2025版)
摘要: The single-channel algorithm (SCA), dual-channel algorithm (DCA), and multichannel algorithm (MCA) are commonly utilized in passive microwave remote sensing for estimating soil moisture (SM) and vegetation water content (VWC). However, determining the most effective algorithm(s) remains a challenge as there is a lack of comparative research on these algorithms. To this end, a comprehensive evaluation of these algorithms is presented using multifrequency radiometry data collected during a ground-based experiment. SM and VWC are separately estimated through a single-objective estimation (SOE) or simultaneously estimated through a dual-objective estimation (DOE) framework. The study reveals that SOE yields better results than the DOE framework in estimating SM and VWC using the SCA, DCA, and MCA algorithms, with decreasing accuracy performance as follows: MCA-SOE>DCA-SOE>SCA-SOE>MCA-DOE>SCA-DOE>DCA-DOE. Within the MCA-SOE scheme, the utilization of five-channel TBs (i.e., combination of V-polarized TB at L-band, dual-polarized TBs at Ku- and Ka-bands) leads to the most accurate SM and VWC retrievals, with an R value of 0.824 and a root mean square error (RMSE) (unbiased RMSE, ubRMSE) of 0.039 (0.037) m(3)/m(3) for SM, and an R value of 0.771 and an RMSE (ubRMSE) of 0.707 (0.705) kg/m(2) for VWC. An exceptional case shows that SM retrieval from a single Ku-band TB slightly exceeds that from MCA-SOE in $R$ value (0.831 versus 0.824), due to the less sensitive Ka-band TBs introduced in MCA-SOE. This evaluation underscores the benefits of employing SCA, DCA, and MCA algorithms for SM and VWC estimation, providing insights for enhancing SM retrieval methodologies and selecting optimal frequency and polarization.
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