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当前位置: 首页 > 文章 > 新疆天山山区TRMM卫星降水数据的精度检验和校正方法研究 水土保持研究 2017,24 (6) 327-333
Position: Home > Articles > Research on Accuracy Validation and Calibration Methods of TRMM in Tianshan Mountains of Xinjiang Research of Soil and Water Conservation 2017,24 (6) 327-333

新疆天山山区TRMM卫星降水数据的精度检验和校正方法研究

作  者：
李慧;杨涛;何祺胜;任伟伟
单  位：
河海大学地球科学与工程学院
关键词：
天山山区;TRMM;校正;CART;精度检验
摘  要：
在降水资料缺乏的天山山区,基于重建时间序列后的NDVI和DEM数据,采用CART算法对TRMM3B43月降水数据进行校正。利用研究区25个站点实测降水量对校正前的TRMM降水数据和校正后的TRMM降水数据分别进行精度检验。结果表明:校正前TRMM月降水与站点实测降水有很好的一致性,存在显著的线性相关关系,但误差较大;TRMM降水与实测降水的决定系数(R2)随时间尺度的增大而减小,相对误差(δ)和均方根误差(RMSE)则随之增大,说明TRMM遥感数据的精度随时间尺度的增加而减小;校正后TRMM降水精度得到了显著地提高,与实测降水在月、季、年尺度上的R2分别为:0.97,0.87,0.83,相比校正前R~2提高了10%以上,误差也有明显的减小。这说明在天山山区,使用CART对TRMM降水数据进行校正的方法可行。
译  名：
Research on Accuracy Validation and Calibration Methods of TRMM in Tianshan Mountains of Xinjiang
作  者：
LI Hui;YANG Tao;HE Qisheng;REN Weiwei;State Key Laboratory of Oasis Ecology and Desert Environment,Xinjiang Institute of Ecology and Geography,CAS;University of Chinese Academy of Sciences;State Key Laboratory of Hydrology Water Resources and Hydraulics Engineering,Hohai University;Earth Science and Engineering,Hohai University;
关键词：
Tianshan Mountains;;TRMM;;calibration;;CART;;accuracy validation
摘  要：
Based on the NDVI data after time series reconstruction,we used DEM data to extract the geographical factors,such as slope and aspect,using the method of CART,and mainly calibrated the TRMM3B43 monthly precipitation data in the Tianshan Mountains lacking of observed precipitation data.We used the 25 stations precipitation data to test the precision of TRMM precipitation data and TRMM precipitation data after calibration,respectively.The results showed that TRMM monthly precipitation had a good consistency with observed data,there was a significant linear correlation relationship,but had a the significant deviation.The coefficient of determination(R~2)between TRMM precipitation and observed precipitation decreased with time,the relative error(δ)and root mean square error(RMSE)increased,illustrating that the precision of remote sensing data of TRMM decreased with time;the accuracy of TRMM precipitation after calibration had been significantly improved,R~2 were 0.97,0.87 and 0.83,which was between TRMM precipitation and observed precipitation on different temporal scales of month,season and year,and increased by more than 10% compared to the previous correction,deviation had decreased obviously.The results proved that the calibration method of CART to the TRMM precipitation data in Tianshan Mountains was feasible.

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