基于二维七参数转换模型的坐标转换参数的计算

The Caculation of Coordinate System Conversion Parameters Based on the 2-D Seven Parameters Model

基于二维七参数平面坐标转换方法,采用间接平差方法来计算不同大地基准下的坐标转换参数。同时利用浙江省GPS基础控制网数据,计算出浙江省范围内从1980年西安坐标系向2000国家大地坐标系的坐标转换参数,以浙江省1∶10 000基础地理信息数据库的转换实验为例,得出该转换方法可以在无大地高、无空间直角坐标转换计算的情况下,实现省级区域内基础地理信息数据在不同基准下的大地坐标直接转换。实验结果表明,该方法简单有效,其坐标转换精度符合要求。

This article introduces the coordinate system conversion methods based on the 2-D seven parameters mod-el.The transformation parameters under different geodetic datum were calculated by the method of indirect adjustment. We used Zhejiang GPS geodetic network data and calculated the transformation parameters between Xian1980 and CGCS2000.Take example for transforming the 10000 fundamental geographic database of Zhejiang province,the 2-D seven parameters model could perform coordinates transformation of different geodetic datum across provincial bounda-ries.The results showed that the method is effective and the transformation accuracy of coordinate are also well.