威海97独立坐标系与CGCS2000坐标转换方法的研究

A Study on The Coordinate Transform Method from Weihai 97 Independent Coordinate System To CGCS2000

针对威海市目前基础地理信息数据坐标系不统一的问题,尤其是以地方独立坐标系存储的大量基础地理信息数据向CGCS2000转换的问题,采用何种方法实现威海97独立坐标系与CGCS2000的坐标转换是一个关键的技术。文章提出了一种基于二维四参数转换模型将威海97独立坐标系转换为CGCS2000的坐标转换方法。首先开展威海市D级GNSS控制测量工作,经过基线解算与网平差得到公共点坐标,然后通过重合点选取和求参计算及粗差点剔除得到威海97独立坐标系与CGCS2000间的转换参数,最后通过内符合精度及外符合精度评定确认转换参数的可靠性和精度的良好。

At present,the coordinate system of Weihai geographic information data is not consistent,especially a large number of basic geographic information data use the local independent coordinate system which is difficult in converting to CGCS2000,it＇s a key technology to solve the transformation problem.The paper proposes a transform method based on four parameter model to achieve the goal.First,after the D-Level GNSS control surveying work in Weihai City,get the common points through baseline solution and net adjustment,then we get the transform parameter of the Weihai 97 independent coordinate to CGCS2000 by selecting coincidence point,calculate the parameters and remove the rough point.Finally,the reliability and accuracy of the transform parameters are confirmed by evaluating the internal and external accuracy.