高分辨率厘米级局部大地水准面的典型应用
Typical Applications of the Local Geoid Model with High Resolution and Centimeter Accuracy
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摘要: 介绍了香港大地水准面HKGEOID-2000和深圳市高分辨率、高精度似大地水准面SZGEOID-2000。利用HKGEOID-2000和GPS椭球高求得的正常高与香港地区由三角高程测量得到的"正常高(或本地高)"进行比较,结果表明,其差值的均方根为0.102m,标准差(STD)为±3.4cm。结合HKGEOID-2000、SZGEOID-2000和这两个大地水准面模型重复覆盖地区的高精度GPS水准数据,探测这两个大地水准面模型之间的差异和香港主要高程基准面(HKPD)与我国1956黄海高程基准面之间的系统偏差。Abstract: An improved geoid model for Hong Kong,HKGEOID-2000 with 1km resolution,was developed with remove-restore approach and 1D-FFT technique.This geoid model,along with GPS ellipsoidal heights,is employed to determine the errors of the "orthometric heights" from purely trigonometric heighting in Hong Kong,yielding an RMS error of 0.102m and the standard deviation ±3.4cm.
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