区域大地水准面的精化

Research in High Accuracy Local Geoid

采用重力法结合GPS水准纠正方法,研究了某一测区区域大地水准面的精化问题,经检验成果达到了设计要求,参考模型分别为WDM94和EGM96时确定的最终大地水准面,其内部检核精度中误差分别为±8.7 cm和±9.8 cm;外部精度中误差分别为±8.3 cm和±10.8 cm,对未经GPS水准拟合的重力大地水准而言,中误差为±27.4 cm.结果表明,此法获取的高精度大地水准面成果不仅能满足科学需要,同时能满足生产需要.

The method of gravity and GPS leveling are adopted to reach high accuracy local geoid in an area. The examination demonstrates that the accuracy of the last geoid is reliable through interior examination precision. The root mean square error of the last geoid is ± 8.7 cm when the reference model is WDM94. It is ± 9. 8 cm when the reference model is EGM96. It is ± 8. 3 cm when the reference model is WDM94. The root mean square error of the last geoid is ± 10. 8 cm when the reference model is EGM96, through exterior examination precision. Before the test of GPS leveling, the root mean square error of the last geoid is ± 27.4 cm. The result indicates that the last geoid in the method can satisfy not only the research but also production.