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Your search keyword '"Zhou, Fang-Cheng"' showing total 19 results
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19 results on '"Zhou, Fang-Cheng"'

6. A Physical Process-Based Enhanced Adjacent Channel Retrieval Algorithm for Obtaining Cloudy-Sky Surface Temperature

Author

Zhu, Xin-Ming, Song, Xiao-Ning, Li, Xiao-Tao, Zhou, Fang-Cheng, and Guo, Han

Abstract

Acquiring cloudy land surface temperature (LST) is crucial for terrestrial ecosystem monitoring and global climate observation. Although numerous methods have been proposed to retrieve cloudy-sky LST using microwave remote sensing, the physical significance of these methods is inadequate due to their oversimplification of the effects of atmospheric components and clouds. To obtain accurate cloudy-sky LST, by simultaneously considering the influences of water vapor and cloud properties on LST, a physics-based LST retrieval algorithm is developed for cloudy skies with adjacent three brightness temperatures (BTs) at 18.7, 23.8, and 36.5 GHz vertically polarization. We develop this algorithm by building a simulated database, which includes a large range of BTs, surface emissivities, air temperatures, and water vapor contents. Meanwhile, various cloudy atmospheric profiles are constructed to reveal multifarious weather conditions. The test results with the simulated database show that the algorithm has good accuracy with an RMSE of 1.75 K and MAE of 1.33 K under cloudy weather. Sensitivity analysis indicates that precipitable water vapor (PWV) and cloud liquid water (CLW) are indispensable for correcting cloudy LST. In particular, LST accuracy shows an evident sensitivity to PWV, and RMSEs are reduced with an increase in PWV. Meanwhile, the proposed algorithm was applied to AMSR-E BTs and ERA5 profile dataset over the China region in 2008 and validated with ground-based air temperatures. Results indicate that RMSEs between retrieved LSTs and true LSTs are 3.47 K for cloudy weather, and there is better performance at high water vapor status, with an RMSE of 2.05 K.

Published
2024
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18. [Evaluation of comprehensive measures of schistosomiasis control in Caidian District, Wuhan City].

Author

Xu JQ, Zhou FC, Yin QB, and Wu CY

Subjects
Adolescent, Adult, Aged, Agriculture instrumentation, Agriculture methods, Animals, Cattle, Cattle Diseases epidemiology, Cattle Diseases parasitology, Child, China epidemiology, Communicable Disease Control instrumentation, Disease Reservoirs parasitology, Feces parasitology, Female, Humans, Male, Middle Aged, Schistosoma isolation & purification, Schistosoma physiology, Schistosomiasis epidemiology, Schistosomiasis parasitology, Young Adult, Cattle Diseases prevention & control, Communicable Disease Control methods, Schistosomiasis prevention & control, Schistosomiasis veterinary, Snails parasitology
Abstract

Objective: To evaluate the implementation and effectiveness of comprehensive control measures of schistosomiasis in Caidian District, Wuhan City., Methods: The data of implementation of the schistosomiasis control measures in Caidian District was collected and analyzed statistically., Results: The number of Oncomelania hupensis snail environments and snail area decreased from 213 sites and 223.47 hm2 in 2003 to 59 sites and 51.20 hm2 in 2013, with the decreasing rate of 72.30% and 77.09%, respectively. The infection rate of schistosomiasis of human decreased from 1.58% in 2006 to 0.24% in 2013, with the decreasing rate of 84.81%. The positive rate of stool tests of cattle was 2.19% in 2006 while it was 0 in 2013., Conclusion: The comprehensive control measures of schistosomiasis are effective.

Published
2014

19. [Estimation of vegetation canopy water content using Hyperion hyperspectral data].

Author

Song XN, Ma JW, Li XT, Leng P, Zhou FC, and Li S

Subjects
Agriculture, Models, Theoretical, Regression Analysis, Environmental Monitoring, Plants, Spectrum Analysis, Water
Abstract

Vegetation canopy water content (VCWC) has widespread utility in agriculture, ecology and hydrology. Based on the PROSAIL model, a novel model for quantitative inversion of vegetation canopy water content using Hyperion hyperspectral data was explored. Firstly, characteristics of vegetation canopy reflection were investigated with the PROSAIL radiative transfer model, and it was showed that the first derivative at the right slope (980 - 1 070 nm) of the 970 nm water absorption feature (D98-1 070) was closely related to VCWC, and determination coefficient reached to 0.96. Then, bands 983, 993, 1 003, 1 013, 1 023, 1 033, 1 043, 1 053 and 1 063 nm of Hyperion data were selected to calculate D980-1 070, and VCWC was estimated using the proposed method. Finally, the retrieval result was verified using field measured data in Yingke oasis of the Heihe basin. It indicated that the mean relative error was 12.5%, RMSE was within 0.1 kg x m(-2) and the proposed model was practical and reliable. This study provides a more efficient way for obtaining VCWC of large area.

Published
2013

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