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High-accuracy topographical information extraction based on fusion of ASTeR stereo-data and ICeSat/GLAS data in antarctica

引用

Science china earth Sciences 2009年第5期52卷 714-722页

作者： e dongchen1,3,shen qiang2,xu ying1,3 & chen gang4.1 chinese antarctic center of surveying and mapping,wuhan university,wuhan 4.0079,china 2 Institute of Seismology china earthquake Administration,wuhan 430071,china 3 Key Laboratory of Polar surveying and mapping,State Bureau of surveying and mapping,wuhan university,wuhan 4.0079,china 4 Department of Geography,university of Calgary,Calgary,Alberta T2N 1N4,Canada chinese antarctic center of surveying and mapping Wuhan University Wuhan 430079 China Institute of Seismology china earthquake Administration Wuhan 430071 China Key Laboratory of Polar surveying and mapping State Bureau of Surveying an

In order to better support antarctic inland ice sheet expedition from Zhongshan Station to Dome A,the topographic data are *** present,although the entire antarctic DeM provided by RAMP(Ra-darsat antarctic mapping Project) was estimated at the highest horizontal(spatial) resolution of about 200 m,the real horizontal resolution of the DeM varies from place to place depending on the density and scale of the original source *** ice shelves and the inland ice sheet,the horizontal resolution is about 5 km;the vertical accuracy is estimated to be ±50 m in interior east antarctic ice sheet and away from the mountain ***,more accurate topographic data are unavailable in *** order to meet the requirements of high-accuracy topographic information for further researches,this paper mainly addresses a fusion study of ASTeR stereo pairs and ICeSat/GLAS altimetry data for extraction of high-accuracy DeM in east antarctica,based on the high horizontal resolution(15 m) of ASTeR and vertical accuracy(13.8 cm) of ICeSat/***,some altimetry data were selected as vertical control points to reduce errors of image correlation matching during the extraction of ASTeR-based ***,ice sheet altimetry data derived from ICeSat were used to generate DeM ranging from 75° to 81°S because existing ASTeR data do not cover this area and high density of the coverage of ICeSat altimetry ***,the DeM in coverage of the expedition route was *** analysis of result reveals that the DeM accuracy is improved *** absolute vertical accuracy of DeM is higher than 15 m in some cases and higher than 30 m for all the areas along the expedition route except from the 009-001 scene;the interior accuracy is higher than 15 m and higher than 7 m in some *** can meet the requirements of topographic map at 1:50000 scale,which is an economic and advantageous method to produce the topographic products.

关键词： DeM antarctica Zhongshan Station Dome A ASTeR ICeSat GLAS

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