[1]YANG Gang,GUO Peng,LI Xican,et al.Assessment on Applicability of Soil Moisture Products of Fengyun Satellite Microwave Remote Sensing[J].Research of Soil and Water Conservation,2020,27(01):104-111,118.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 01
Page number:
104-111,118
Column:
Public date:
2020-02-20
- Title:
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Assessment on Applicability of Soil Moisture Products of Fengyun Satellite Microwave Remote Sensing
- Author(s):
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YANG Gang, GUO Peng, LI Xican, WAN Hong, MENG Chunhong
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(College of Information Science and Engineering, Shandong Agricultural University, Taian, Shandong 271018, China)
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- Keywords:
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microwave remote sensing; soil moisture; FengYun; AMSR-2; applicability
- CLC:
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S152.7
- DOI:
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- Abstract:
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Soil moisture is a key variable in hydrological processes, bioecological processes, and biogeochemical processes. Long-term observations of soil moisture over large areas are critical to research on flooding and drought monitoring, water resource management, and crop yield forecasts. This paper is based on the measured data of 35 ground monitoring stations in the Agricultural Research Service(ARS)hydrological monitoring network of Southwest Oklahoma, USA, LWREW(Little Washita Experimental Watershed)and FCREW(Ft. Cobb Reservoir Experiment Watershed). The applicability of moisture products of FY-3B, FY-3C and AMSR-2 soil from May 1, 2016 to May 31, 2018 in this region was analyzed and compared. The results show that the soil moisture products of FY-3B and FY-3C are overestimated compared to the measured soil moisture in LWREW and FCREW areas, the average biases of the FY-3B soil moisture products in the two regions are 0.070 m3/m3 and 0.048 4 m3/m3, and the average biases of the FY-3C soil moisture products in the two regions are 0.060 2 m3/m3 and 0.053 2 m3/m3. In the seasons with more precipitation, the retrieval results of FY-3B and FY-3C products increased significantly, and JAXA soil moisture products underestimated the soil moisture in LWREW and FCREW areas, with an average biases of -0.100 5 m3/m3 and -0.100 3 m3/m3 in both regions. In the LWREW area, the FY-3B ascending orbital soil moisture product performed best, with the higher correlation coefficient(R=0.664 8), the lower root mean square(RMSE=0.075 5 m3/m3)and the average bias(0.061 6 m3/m3). In the FCREW area, JAXA had the best performance, with the highest correlation coefficient(R=0.726 1)and lowest unbiased root mean square(ubRMSE=0.035 7 m3/m3). In general, FY-3B, FY-3C, and JAXA soil moisture products are able to reflect the seasonal changes of soil moisture in the LWREW and FCREW areas.