Sensitivity of digital elevation models:The scenario from two tropical mountain river basins of the Western Ghats,India

查看全文 作　　者：Jobin [1]Thomas;Sabu [2]Joseph;[3]K.P.Thrivikramji;[4]K.S.Arunkumar

机构地区：[1]Inter University Centre for Geospatial Information Science and Technology,University of Kerala,Thiruvananthapuram,Kerala,India;[2]Department of Environmental Sciences,University of Kerala,Thiruvananthapuram,Kerala,India;[3]Department of Geology,University of Kerala,Thiruvananthapuram,Kerala,India;[4]Department of Geology,MES College,Ponnani,Malappuram,Kerala,India

出　　处：《Geoscience Frontiers》索引2014年第5卷第6期,共17页

基　　金：Financial support from Kerala State Council for Science,Technology,and Environment,Thiruvananthapuram and permission for the field studies in the protected areas by Kerala Forest Department 摘　　要：The paper evaluates sensitivity of various spaceborne digital elevation models(DEMs),viz.,Advanced Spaceborne Thermal Emission and Reflection Radiometer(ASTER),Shuttle Radar Topography Mapping Mission(SRTM) and Global Multi-resolution Terrain Elevation Data 2010(GMTED),in comparison with the DEM(TOPO) derived from contour data of 20 m interval of Survey of India topographic sheets of 1:50,000 scale.Several topographic attributes,such as elevation(above mean sea level),relative relief,slope,aspect,curvature,slope-length and-steepness(LS) factor,terrain ruggedness index(TRI),topographic wetness index(TWI),hypsometric integral(Ihyp) and drainage network attributes(stream number and stream length) of two tropical mountain river basins,viz.,Muthirapuzha River Basin and Pambar River Basin are compared to evaluate the variations.Though the basins are comparable in extent,they differ in respect of terrain characteristics and climate.The results suggest that ASTER and SRTM provide equally reliable representation of topography portrayed by TOPO and the topographic attributes extracted from the spaceborne DEMs are in agreement with those derived from TOPO.Despite the coarser resolution,SRTM shows relatively higher vertical accuracy(RMSE=23 and 20 m respectively in MRB and PRB) compared to ASTER(RMSE=33 and 24 m) and GMTED(RMSE =59 and 48 m).Vertical accuracy of all the spaceborne DEMs is influenced by relief of the terrain as well as type of vegetation.Further,GMTED shows significant deviation for most of the attributes,indicating its inability for mountain-river-basin-scale studies. 关键词：数字高程模型山地流域灵敏度热带印度地形起伏 ASTER 山脉

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Sensitivity of digital elevation models:The scenario from two tropical mountain river basins of the Western Ghats,India

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