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《Research of Soil and Water Conservation》 2017-06
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Research on Accuracy Validation and Calibration Methods of TRMM in Tianshan Mountains of Xinjiang

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;  
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.
【Fund】: 国家自然科学基金面上项目(41371051);; 中科院重点部署课题(KZZD-EW-12-1);; 荒漠与绿洲生态国家重点实验室基金(G2014-02-04)
【CateGory Index】: P412.27;P426.6
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