Applicability of SRTM data for landform characterisation and geomorphometry: a comparison with contour-derived parameters  

作　　者：V.Prasannakumar RShiny NGeetha HVijith 

机构地区：[1]Centre for Geoinformation Science and Technology,University of Kerala,Kariavattom,Thiruvananthapuram,Kerala 695581,India

出　　处：《International Journal of Digital Earth》2011年第5期387-401,共15页国际数字地球学报（英文）

摘　　要：Geomorphologic and hydrologic research heavily depends on digital elevation models(DEM)which are currently being prepared from digital contours.The present study examines the use and applicability of freely available global elevation data source(3 arc seconds finished Shuttle Radar Topography Mission(SRTM))in landform characterisation,geomorphometry,river basin studies and other allied scientific applications in comparison with contour elevation data derived from the surveyed topographical sheets.The relief data extracted from a conventionally digitised geo-information science dataset of topographic contours(1:50,000)are compared with the SRTM-DEM and the variations are analysed.The automated geomorphometric and landform parameters derived from the contour DEM and the computed statistical properties of those parameters have substantial agreement with the same parameters derived from the SRTM-DEM.At the same time,localised variations also exist in some spatial domains.Derivative landscape analysis outputs from the SRTM-DEM suggest the wide acceptability and applicability of the freely available SRTM data source,especially in the regional scale applications related to hydrological modelling,terrain characterisation,disaster management and land degradation studies.

关 键 词：GEOMORPHOMETRY landform characterisation SRTM wetness index terrain position index 

分 类 号：P20[天文地球—测绘科学与技术]