利用跨海水准测量实现岛屿间的高程传递

Using Sea-crossing Leveling Measurement to Implement Elevation Transmission Between Islands

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。

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.lt takes the corresponding measures and methods to effectively eliminate and reduce the influence of the error term,and then achieves a satisfactoty result.The mean square error of unit weight for heighterrorisaround±2.69mm.