摘要
利用GPS技术可获得精度优于1 cm的大地高,若能够获得相应点的高精度似大地水准面(高程异常),则可将大地高转换为相应精度的正常高,从而代替相应等级的水准测量。文中介绍了清远市清城区似大地水准面的计算方法,并对计算结果进行了分析和评价。结果表明,清远市清城区1 km格网似大地水准面的精度为1.3 cm。
It＇s possible to get the geodetic height with the precision of 1 cm by GPS. If the quasi-geoid could be obtained with high precision, then the geodetic height can be transformed into the normal height with the same precision, and the GPS technique together with the quasi-geoid can be employed to substitute as the same leveling with high precision. The precision method of the quasi-geoid for Qingcheng distriot, Qingyuan city, is introduced in this paper, and then the quasi-geoid is analyzed and evaluated. The results show that the accuracy of the quasi-geoid can arrive at 1.3 cm.
出处
《测绘工程》
CSCD
2008年第4期43-46,共4页
Engineering of Surveying and Mapping
