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Water vapor retrieval method based on MODIS thermal infrared band and projection pursuit model |
Yitong LIN1, Junfei YE2, Yongqian WANG3( ), Shiquan ZHONG4 |
1. Nanning Weather Bureau, Nanning 530022, China 2. Yongning District Weather Bureau,Nanning 530022, China 3. Chengdu University of Information Technology, Chengdu 610225, China 4. Guangxi Institute of Meteorology and Disaster Reduction/Remote Sensing Application and Test Base of National Satellite Meteorology Centre, Nanning 530022, China |
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Abstract Precipitable water vapor retrieval methods using MODIS data are mainly based on near infrared and thermal infrared data. Compared with the thermal infrared methods, the near infrared methods have higher inversion accuracy. The near infrared water vapor retrieval method is only applicable to daytime; by contrast, the thermal infrared water vapor data can be obtained both day and night. Therefore, the thermal infrared data are more suitable for operational applications. It is of great significance to improve the accuracy of thermal infrared water vapor retrieval methods. By means of variable selection experiments and results comparing experiments, the precision of variable associations were tested with the optimal substitution variable associations selected, and the water vapour retrieval method based on projection pursuit model has been found. The inversion experiment over the 2015 summer water vapor in the South United States and July 2011 in Shanxi Province of China were carried out through projection pursuit model with inverse results validated by the the water vapor detection data(WGPS). According to the results obtained, in South United States, the root-mean-square error was 2.478 mm based on the water vapor retrieval model of brightness temperature and projection pursuit. In Shanxi province of China, the root-mean-square error was 1.408 mm. Compared with thermal infrared vapor product of MODIS, it had higher accuracy; compared with MODIS near infrared water vapor product, it had higher accuracy and temporal resolution. This method has the potential of business promotion.
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Keywords
brightness temperature
water vapor column
projection pursuit
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Corresponding Authors:
Yongqian WANG
E-mail: wyqq@cuit.edu.cn
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Issue Date: 10 September 2018
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