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Digital Terrain Modelling Using Corona and ALOS PRISM Data to Investigate the Distal Part of imja glacier,Khumbu Himal,Nepal

引用

Journal of Mountain Science 2011年第3期8卷 390-402页

作者： LAMSAL Damodar SAWAGAKI Takanobu WATANABE Teiji Graduate School of Environmental Science Hokkaido University Faculty of Environmental Earth Science Hokkaido University

This study used Corona KH-4A and Advanced Land Observing Satellite (ALOS) PRISM images to generate digital terrain models (DTMs) of the distal part of imja glacier,where a few supraglacial ponds (～0.07 km 2) expanded into the large imja glacier Lake (imja Tsho,～0.91 km 2) between 1964 and *** and subsequently derived topographical maps with contour intervals of 1 m were created from the high-resolution images (Corona in 1964 and ALOS in 2006) in the Leica Photogrammetric Suite (LPS) *** DTMs and topographic maps provided excellent representation of the elevation and micro-topography of the glacier surface,such as its supra-glacial ponds/lake,surface depressions,and moraine ridges,with an error of about +/-4 m (maximum).The DTMs produced from the Corona and ALOS PRISM images are suitable for use in studies of the surface change of *** topographical maps produced from the Corona data (1964) showed that part of the dead ice in the down-glacier area was even higher than the top of the lateral moraine ridges,while the glacier surface in the up-glacier area was noticeably lower than the moraine *** suggests more extensive melting of glacier ice in the up-glacier area before *** average lowering of the glacier surface from 1964 to 2006 was 16.9 m for the dead-ice area west of the lake and 47.4 m for the glacier surface east of the lake;between 1964 and 2002,the lake surface lowered by 82.3 *** figures represent average lowering rates of 0.4,1.1,and 2.2 m/year for the respective areas.

关键词： imja glacier Nepal Himalaya DTM Topographic map Surface lowering Corona ALOS PRISM

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