摘要
在MODIS大气含水量反演过程中误差不可避免,要使用MODIS大气含水量产品必须进行适当订正。以日MODIS大气含水量数字产品为实验样本,根据探空站观测资料,通过差值实现对MODIS大气含水量数字产品的订正。再利用地面水汽压和大气含水量良好的线性关系,通过线性拟合来验证MODIS大气含水量数字产品地面资料订正方法的有效性。结果表明:订正后,2002年1月15日、4月15日、7月15日和10月15日地面水汽压和MODIS大气含水量的相关系数分别提高了0.163,0.049,0.613,0.189;绝对误差分别下降了2.36,0.36,3.22,1.84;相对误差分别减少了64%,13%,29%,51%。差值订正法能对MODIS大气含水量产品进行有效订正,并提高遥感反演大气含水量的精度,充分发挥卫星观测优势,为其他相关研究提供更为客观的参数。
Since error is inevitable in the inversion process of MODIS atmospheric moisture content, the atmospheric moisture products have to be treated properly. Selecting the digital products containing quantity MODIS atmosphere as experimental samples, we achieved MODIS atmospheric moisture digital product correction according to the data of sounding station by the IDW metho＆ Based on the good line- ar relationship between ground surface vapor pressure and water -＇apor, we made use of the linear fitting results to prove the effectiveness of authenticating the MODIS water vapor digital product ground materi- als. Results showed that the ground vapor pressure and the correlation carficients of MODIS atmospher- ic moisture content for January 15, April 15, July 15 and October 15 in 2002 were raised by 0. 163, 0. 049, 0. 613, and 0. 189 respectively after the correction, and after the correction, absolute error dropped by 2.36, 0.36, 3.22 and 1.84, and the relative error decreased by 64%, 1：5 %, 29%and 57 %. Difference between the corrections of the MODIS atmospheric water content products was effectively re- vised, and the accuracy of remote sensing of atmospheric water content was improved. Such a method gives full play to the advantages of satellite observation, and provides parameters for other researches.
出处
《淮海工学院学报（自然科学版）》
CAS
2012年第2期60-65,共6页
Journal of Huaihai Institute of Technology:Natural Sciences Edition
