格罗夫山冰原岛峰高程测定

南极内陆格罗夫山地区冰原上坐落着64座冰原岛峰,它们绝大多数的高程都未被直接测定.2010年中国第26次南极科学考察格罗夫山分队,通过精密测绘方法测定了梅森峰、威尔逊岭的高程,并发现梅森峰是格罗夫山地区的最高峰.由于梅森峰、威尔逊岭四壁陡峭,难以攀登,为确保测量的精确性,首先在梅森峰附近的冰面上选取了3个基准点,采用G...

DETERMINATION OF THE ELEVATION OF NUNATAKS IN THE GROVE MOUNTAINS

Many exposed nunataks locate in the Grove Mountains of the Antarctic inland, and the majority of those elevations have not been measured yet. The elevations of Mason Peak and Wilson Ridge are precisely determined by the Grove Team of CHINARE-26 in 2010. The Mason Peak turns out to be the highest of the Grove Mountains. Considering the Mason Peak and Wilson Ridge are difficult to climb due to their cragginess, we firstly select three control points on the ice surface near the Mason Peak and position them with GPS. Thus, the accurate elevations of Mason Peak and Wilson Ridge can be calculated from three directions using forward intersection and trigonometric leveling by setting precision theodolite on the chosen control points. It has solved the puzzle of their geodetic height in geography. The result provides important information which can be referred as highly precise control points for Antarctic surveying and mapping. This paper elaborates how to measure and compute the elevation of the mountains, and analyses the principal elements that influence the accuracy of trigonometry leveling such as the determination of refraction coefficient K, the observing structure and the distance.