Accuracy evaluation of SRTM data based on ICESat/GLAS altimeter data: A case study in the Tibetan Plateau
WAN Jie1,2, LIAO Jingjuan1, XU Tao1,2, SHEN Guozhuang1
1. Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：To understand the accuracy and error characteristics of the shuttle Radar topography mission (SRTM) elevation data,the authors used the more precise ICESat/GLAS laser altimeter data as reference data in the Tibetan Plateau covering various landscape types so as to assess the accuracy of SRTM and explore the relationship between SRTM and terrain factors (slope and aspect) through bilinear interpolation algorithm. The experimental results show that ICESat altimeter data are highly correlated with SRTM data, with a correlation coefficient of 0.999 8. The system error of SRTM is 2.36±16.48 m,with a RMSE of 16.65 m. The accuracy of SRTM data decreases obviously as the slope increases when the slope is lower than 25°. In addition, compared with ICESat altimeter data, the measurements of SRTM elevation are higher in the north, northwest and northeast directions, and lower in the south, southeast and southwest directions in the Tibetan Plateau.
万杰, 廖静娟, 许涛, 沈国状. 基于ICESat/GLAS高度计数据的SRTM数据精度评估——以青藏高原地区为例[J]. 国土资源遥感, 2015, 27(1): 100-105.
WAN Jie, LIAO Jingjuan, XU Tao, SHEN Guozhuang. Accuracy evaluation of SRTM data based on ICESat/GLAS altimeter data: A case study in the Tibetan Plateau. REMOTE SENSING FOR LAND & RESOURCES, 2015, 27(1): 100-105.
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2015, Vol. 27 
