港珠澳大桥岛隧工程东西人工岛精密跨海高程传递测量

Precision sea-crossing elevation transfer survey between east and west artificial islands for Hongkong-Zhuhai-Macao Bridge

以港珠澳大桥岛隧工程东、西人工岛之间精密高程传递测量为例,介绍经纬仪倾角法在精密高程传递测量的网点设计、觇板制作、外业观测、精度分析等各环节,制定出消除或减弱影响海上测量精度的细则。经工程实践验证,该方法可以达到二等跨河水准的精度,满足长距离精密跨海高程传递测量的需要。

Based on the precision elevation transfer survey between the east and west artificial islands for Hongkong-zhuhai-Macao Bridge, the paper introduces the theodolite angle method in precise elevation transfer measurement network design,sighting board production, field observation and precision analysis. Detailed rules were worked out for the elimination or weakening of factors influencing the precision of offshore survey. The engineering practice shows that this method can reach second order river crossing leveling accuracy and meet the needs of the long distance cross sea elevation transmission measurement.