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《Geotechnical Investigation & Surveying》 2009-08
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Evaluation and validation of SRTM height data based on continuous GPS observation data

Wang Qijie,Zhu Jianjun,Zhang Xiaohong(Department of Geomatics,School of Info-Physics and Geomatics Engineering,Central South University,Changsha 410083,China)  
Based on the height data of 294 continuously operated GPS stations in South California,USA,this paper evaluates and validates the height accuracy of SRTM data of that area.The results show that,after considering the Geodi-spheroid separation(the reference ellipsoid and the EGM96 Geoid are used as vertical datum for GPS and SRTM respectively),the height differences between SRTM and GPS are very small.The ratios of the stations which height difference are less than 10m,20m and 30m should reach 82.7%,93.9% and 98.3%,respectively.The mean of the overall difference is-4.28m and the standard deviation of the difference is ±8.63m,indicating that the accuracy of the SRTM height in this area is better than the nominal ±16m.
【Fund】: 国家自然科学基金(40774003 10878026);; 国家“863项目”(2006AA12Z156);; 国家西部1∶50000空白区测图工程2007年度研究课题;; 地理空间信息工程国家测绘局重点实验室开放基金(200817)资助
【CateGory Index】: P228.4
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