Abstract：Research purposes:The SRTM DEM and ASTER GDEM data have the advantages of the global scope，free access and high precision． The data were appliied in building railways in mountain area with complex geological condition to evaluate the data accuracy and study the topographic feature for assisting the railway alignment．
Research conclusions:As the SRTM DEM and ASTER GDEM data have its own system error，the measures，such as the digital elevation accuracy evaluation，DEM fusion，elevation datum offset and DEM re － sampling，should be taken for improving the DEM accuracy and building a large range，high accuracy and visual digital topographic feature model to assist the analysis of the structural topographic feature，the geological condition of karst hydrology and the development regulation of geological disaster in order to enhance the quality and efficiency of railway alignment．
高山. 基于SRTM DEM，ASTER GDEM地貌特征分析与铁路选线[J]. 铁道工程学报, 2012, 29(9): 1-6.
GAO Shan. Analysis of Topographic Feature with SRTM DEM and ASTER GDEM Data and Railway Alignment. 铁道工程学报, 2012, 29(9): 1-6.
Guo Lianghao， Wang Huai． Research on Digital Designing Platform in Newly － built Railways ［J］． Journal of Railway Engineering Society，2006 (S1) : 119－125．
Yan Peng，Yang Nong，Ye Baoying ．The Extraction and Study of Geomorphic Surface in Guizhou and Its Adjacent Areas Based on ASTER － GDEM［J］．Remote Sensing for Land ＆ Resources，2011(2) : 98－103．
Liu Jing，Ding Lin，Zeng Lingsen，etc． Large Scale Terrain Analysis of Selected Regions of the Tibetan Plateau: Discussion on the Origin of Plateau Planation Surface［J］．Earth Science Frontiers，2006 (5) : 285－299．
［5］ Hirano A，Welch R，Lang H． Mapping from ASTER Stereo Image Data: DEM Validation and Accuracy Assessment［J］． ISPRS Journal of Photogrammetry and Remote Sensing，2003(57) : 356－370．
［6］ 王广杰，何政伟，仇文侠，等． ASTER 立体像对提取玛尔挡坝区 DEM 及精度评价［J］． 测绘科学，2009 (3) : 94－96．
Wang Guangjie， He Zhengwei， Qiu Wenxia，etc． Extraction and Accuracy Assessment of DEM on Maerdang Dam Area from ASTER Stereo Image Data ［J］． Science of Surveying and Mapping，2009(3) :94－96．
［7］ Nikolakopoulos K G，Kamaratakis E K，Chrysoulaks N． SRTM vs ASTER Elevation Products． Comparison for Two Regions in Crete，Greece ［J］． International Journal of Remote Sensing，2006 (21) : 4819－4838．
［8］ 詹蕾，汤国安，杨昕． SRTM DEM 高程精度评价［J］． 地理与地理信息科学，2010(1) :34－36．
Zhan Lei，Tang Guoan，Yang Xin． Evaluation of SRTM DEMs＇Elevation Accuracy［J］． Geography and Geo － Information Science，2010(1) : 34－36．
2012, Vol. 29 
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