工程测量中新旧坐标转换的一种实现方法

Implementing of coordinate transfering between two survey system in engineering survey

常规的测量坐标转换模型因采用确定的变换参数而导致坐标换算误差。将转换区域内各新旧坐标公共点视为精度均匀的离散点,通过计算区域重心坐标和坐标转换的初始参数,求取各公共点的坐标换算近似值及其改正数。在此基础上,根据公共点旧坐标与其改正数的对应关系,利用常规数字成图软件的离散函数插值功能,获取任意点的坐标换算改正数,实现新、旧坐标转换。实例应用表明,该法简便可行,换算精度高,是新旧测量坐标转换的有效方法。

Coordinate error is produced by taking deterministic transformation parameters in ordinary coordinate transformation model. Regarding common point in different coordinate system as discrete point with same accuracy in conversion zone, approimate conversion coordinates and its corrective values of all common points are obtained by calculating barycentric coordinates and initial conversion parameters. According to the corresponding relation between old coordinates and corrective values of common corrective values of unknown conversion coordinates are obtained by using interpolating function points, in ordinary digital mapping software, and coordinates in different system are conversed. Application indicates that this method, with a simple model and a high conversion accuracy, is a effective way of coordinate transformation.