FY_2G总云量产品在河南省的订正检验

Correction and Validation of FY_2G Total Cloud Amount Products in Henan Province

以河南省为检验区域,采用回归分析法基于地面总云量观测资料对FY_2G卫星观测总云量进行了订正检验.结果表明:(1)河南省采用7 km插值直径,对卫星观测总云量插值到站点,并选取2.3的订正系数,对卫星观测总云量进行订正得到的准确率较高;(2)对FY_2G卫星总云量订正后,总样本的准确率和春夏秋冬四季的准确率均有明显提高;(3)各种天气都订正比晴天不订正总体准确率高;(4)用前期的数据进行回归分析得到一个订正系数进行滑动订正,效果可能会更好,因此关于滑动订正有待后期研究进行.

Abstract:Henan province was selected as the study area in this paper.FY_2G total cloud amount products were corrected and validated which based on ground observation data of total cloud amount.Analysis results showed that:①The 7 km interpolation diameter was used to interpolate the total cloud amount of the satellite to the observation sites in Henan province,and the correction coefficient of 2.3 was selected to correct the total cloud amount of the satellite observation,and the higher accuracy was obtained.②After the correction of the total cloud amount of the FY_2G satellite,the accuracy of the total samples were obviously improved.In the spring,summer,autumn and winter,the accuracy of the four seasons were obviously improved.③The accuracy of correction on all kinds of days was higher than the correction only on the cloud days.④A regression coefficient could be obtained through the regression analysis with the earlier data.The sliding regression analysis could get the better results,so the sliding regression analysis correction was still needed for the later research.