基于GNSS的中国西南地区MODIS水汽校正研究

MODIS Precipitable Water Vapor Correction in Southwest China Based on GNSS

以GNSS水汽为标准,对中国西南地区进行MODIS水汽精度评价和相关性分析,构建MODIS水汽的区域校正模型和单站点校正模型并开展可靠性检验。分区域进行MODIS水汽校正和图像叠加得到校正后的中国西南地区MODIS水汽分布。结果表明,区域模型可替代单站点模型,中国西南地区MODIS水汽季节校正模型效果显著,在春、夏、秋、冬季的均方根误差RMSE分别优于8 mm、9 mm、11 mm和4 mm。

According to the GNSS precipitable water vapor(PWV),we carry out accuracy evaluation and correlation analysis of MODIS PWV in southwest China,construct the regional correction model and single-site correction model of MODIS PWV,and carry out a reliability test.After sub-regional MODIS PWV correction and image superposition,we obtain the corrected MODIS PWV distribution in southwest China.The results show that the regional model can be used to replace the single-site model,and the seasonal correction model of MODIS PWV in southwest China has a significant effect.The root mean square error(RMSE)in spring,summer,autumn and winter are better than 8 mm,9 mm,11 mm and 4 mm,respectively.