摘要
In 2005 China carried out a new geodetic campaign for the height determination of Qo- molangma Feng——Mt. Everest (QF in short). The technical progresses in geodesy for the 2005 campaign are presented in the paper. GPS positioning was the key technique in the campaign. After summarizing the experiences and lessons of the GPS positioning on the QF summit in the previous QF height determination campaigns, some measures were taken to raise the accuracy and reliability of the height determination with GPS techniques. In order to raise the accuracy of the height deter- mination of the QF summit with classical geodetic techniques, laser ranging was used together with the trigonometric levelling in the 2005 campaign. It is the first time in China the thickness of the ice-snow layer on the QF summit was measured by ground penetrating radar integrated with GPS. The local gravity field and geoid in the QF area was improved on the basis of earth gravity field model integrated with new ground gravity data, DTM data and GPS leveling data in the QF area. In the 2005 campaign the normal height and orthometric height (height above sea level) of the snow surface of the QF summit were obtained as 8846.67 m and 8847.93 m respectively. The orthometric height of the rock surface of the QF summit is 8844.43 m,and the thickness of the ice-snow layer on the QF summit is 3.50 m.
In 2005 China carried out a new geodetic campaign for the heightdetermination of Qomolangma Feng―Mt. Everest (QF in short). The technical progresses in geodesy forthe 2005 campaign are presented in the paper. GPS positioning was the key technique in thecampaign. After summarizing the experiences and lessons of the GPS positioning on the QF summit inthe previous QF height determination campaigns, some measures were taken to raise the accuracy andreliability of the height determination with GPS techniques. In order to raise the accuracy of theheight determination of the QF summit with classical geodetic techniques, laser ranging was usedtogether with the trigonometric levelling in the 2005 campaign. It is the first time in China thethickness of the ice-snow layer on the QF summit was measured by ground penetrating radar integratedwith GPS. The local gravity field and geoid in the QF area was improved on the basis of earthgravity field model integrated with new ground gravity data, DTM data and GPS leveling data in theQF area. In the 2005 campaign the normal height and orthometric height (height above sea level) ofthe snow surface of the QF summit were obtained as 8846.67 m and 8847.93 m respectively. Theorthometric height of the rock surface of the QF summit is 8844.43 m, and the thickness of theice-snow layer on the QF summit is 3.50 m.
作者
CHEN Junyong1,2, YUAN Janli1,2, GUO Chunxi1,2, ZHANG Yanping1 & ZHANG Peng1,2 1. State Bureau of Surveying and Mapping, Beijing 100830, China
2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
