摘要
分析了城市控制测量中投影面变化对坐标值的影响,提出了一种特殊情况下的平面直角坐标的计算方法,即当投影长度变形大于2.5 cm/km时,首先通过高斯反算求出点的地理坐标(B,L),然后再确定投影面高度,最后通过高斯正算求出投影于抵偿面上的平面直角坐标。该方法与以往抵偿坐标系计算中仅计算长度元素的缩放比例的算法不同。
This paper analyzes the influence of coordinates because of the project surface change in urban control survey. The paper puts forward the computation method of plane coordinate under a special situation. When projection length deformation is more than 2.5cm/kin, the paper computes first the geographic coordinates, and then confirms the height of the projection surface, finally, confirms the height of compensatory surface by means of Gauss direct position computation and computes the plane rectangular coordinates. This method differs from the forepassed the compensatory coordinates computing method which is only computation of length elements＇ scaling.
出处
《地矿测绘》
2009年第3期41-42,共2页
Surveying and Mapping of Geology and Mineral Resources
关键词
高斯投影
长度变形
平面直角坐标
Gauss projection
length deformation
plane rectangular coordinate
