宽水网地区三角高程测量代替等级水准测量的可行性

The Feasibility of Trigonometric Height Survey for Replacement of Order Levelingin Wide Network of Rivers

对虎门大桥等4座特大桥三角高程网试验观测数据进行了统计分析,比较了往返测高差较差、环闭合差与三、四等水准相应限差的差异及公共点上三角高程值与二等跨河水准高程值的差异,证实在宽水网地区用对向三角高程代替四等水准进行跨河水准测量是完全可行的,但代替三等跨河水准测量,可靠性只有75%左右。

Based on a statistics analysis of the experimental data of trigonometric leveling networks at four extralong bridges such as the Humen bridge, etc., comparisons are made in forward and backward altitude differences, loop closures, the third and the fourthgradeleveling surveys difference limitations, and the altitude differences between trigonometric height survey and order leveling at common points. It is verified that in networks of rivers, using trigonometric height survey to replace the fourthgradeleveling is completely feasible for the leveling measurement of crossing rivers, but when using it to replace the thirdgradeleveling, the reliability is only about 75%.