平面线性四参数模型在地籍测量中的应用

The Application of Planar Linear Model of Four Parameters In Cadastral Survey

在地籍测量中我们常用的坐标系是西安80坐标系和一些地方坐标系,且多数情况下用的是平面坐标系(一般,高程需单独处理)。另外,地籍测量一般作业区域不大,可将其视为平面。坐标系转换问题可简化为平面坐标系之间的转换,其转换一般用的是四参数模型。本文详细推导了建立简化的坐标转换四参数模型的过程,再运用最小二乘平差原理求出四参数的精确解,然后对其进行精度评定,最后给出算例验证了模型在满足精度的前提下,具有广泛的实用性。

In cadastral survey ,it often use Xi＇an 80 coordinate system and some local coordinate systems ,and in most cases , use planar coordinate system（Generally ,dealing with the elevation alone） .In addition ,the scope of work is limited ,so we can see it as a plane .So ,the problem of coordinate system conversion could reduce the problems of the conversion between plane coordinate systems .Usually it use the four parameters model .In this paper ,we develop the process of building the four parameters simplified model ,solving the exact solution by using the least squares principle of adjustment ,then evaluate its precision .Under the precondition of satisfying the precision ,it give an example to prove its comprehensive commodity .