利用跨海水准测量实现岛屿间的高程传递

结合2015年某海洋测绘任务特点,对跨海水准测量的误差来源进行了认真分析,做出了利用跨海水准测量实现岛屿间高程传递的技术方案设计。针对跨海水准测量存在的3种重要误差来源,利用辅助设备测量全站仪和觇板高度、适当增加测角测回数提高垂直角测量精度、精心策划测量步骤减小大气垂直折光误差等手段,有效消除和减小了误差项影响,最后通过平差得到了高差单位权中误差为±2.69mm的测量成果,满足了三等水准测量要求,实现了海洋岛屿间的大跨度高程传递。

Using Seacrossing Leveling Measurement to Implement Elevation Transmission Between Islands

Combined with the characteristics of Lianshan marine charting tasks in 2015,and based on the analysis of error sources of the sea-crossing leveling measurement carefully,this article takes a new method to analyze the error sources.The method implements third-class sea-crossing leveling surveying using the trigonometric leveling with distance measurement.It takes the corresponding measures and methods to effectively eliminate and reduce the influence of the error term,and then achieves a satisfactory result.The mean square error of unit weight for height error is around ±2.69mm.