摘要
提出使用差分线性校正模型(DLCM)对MODIS红外波段大气水汽产品进行校正。利用在中国获取的两幅MODIS红外波段水汽产品进行分析后发现,在中国西部地区,受水汽参考值精度较差的影响,DLCM模型和传统线性校正(LS)方法均难以获得稳定、理想的校正结果;而在中国东部地区,DLCM模型可有效提高大气水汽的估计精度,且与LS方法相比,进行内符合精度评定时STD和RMS可以额外降低32.6%和15.7%,进行外符合精度评定时STD和RMS可额外降低32.3%和21.7%。此外,DLCM模型校正后的MODIS红外水汽产品在InSAR大气改正中的实验研究,亦证实了DLCM模型的有效性和将其用于InSAR大气改正的可行性。
In order to take advantage of MODIS PWV, which can be also acquired during the night- time, a differential linear calibration model （DLCM） is presented in this paper. Two MODIS IR water vapor scenes are selected to analyze the performance of the DLCM. Results show that due to the poor accuracy of reference PWV measurements in western China, neither the DLCM nor the least-square （LS） method obtain satisfactory calibrations. However, calibrations of MODIS IR water vapor prod- uct in eastern China show that the DLCM has advantages over the LS method; the STD and RMS of the difference between calibrated and referred PWV measurements show an extra 32.6% and 15.7% improvement during the internal coincidence precision assessment, which the STD and RMS improve by extra 32.3% and 21.7% during the external coincidence precision assessment. Moreover, the cali- brated MODIS IR water vapor product with DLCM is further used for InSAR atmospheric correction. Results show that the proposed DLCM is effective and it can be used to mitigate the InSAR atmos- pheric delay.
出处
《大地测量与地球动力学》
CSCD
北大核心
2016年第1期47-51,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41506211)
上海市“扬帆计划”(14YF1410200)
上海市教育委员会科研创新项目(14YZ118,14YZ148)
上海高校青年教师培养计划(A1-2035-15-0021-12)
上海海洋大学博士科研启动基金(A1-0209-13-0105395,A2-0302-14-300065)~~
