基于GPS的河北省冬春季节MODIS水汽校正模型研究

以河北省为例，利用GPS水汽进行MODIS水汽的校正模型研究。通过GPS水汽与MODIS水汽的比较发现，两者的相关系数超过0.879，均方根误差达到2.31 mm，说明两者存在较好的相关性和一定的偏差；利用线性回归方法分别构建城市和区域MODIS水汽校正模型，实验证明，利用实测GPS水汽对城市模型和区域模型进行可靠性验证，9个测站的模型检验的均方根误差小于1 mm。两类模型均可有效提高MODIS水汽精度，满足气象预报应用的要求。

The Correction Model of MODIS PWV in Spring and Winter of Hebei Province Based on GPS

Taking 11 cities of Hebei province as examples, the correction models of MODIS PWV based GPS are studied. Firstly, we compare GPS PWV and MODIS PWV. There is good correlation and existing deviation between GPS PWV and MODIS PWV; the correlation coefficient is more than 0.879 and the root mean square error amounted to 2.31 mm. Secondly, we construct the cities’ and regional MODIS PWV correction models using linear regression method. Finally, we verify the reliability of city and regional models compared with GPS PWV. It is concluded that city and regional models of MODIS PWV can effectively improve the accuracy of MODIS PWV, while the root mean square error is less than 1 mm. The accuracy of MODIS PWV correction model can meet the application of weather forecasting.