Development of a Coordinate Transformation method for direct georeferencing in map projection frames
Development of a Coordinate Transformation method for direct georeferencing in map projection frames
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DOI：
10.1016/j.isprsjprs.2012.12.004
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发表时间：
2013-03
影响因子：
12.7
通讯作者：
Haitao Zhao;Bing Zhang;Changshan Wu;Zhengli Zuo;Zhengchao Chen
中科院分区：
文献类型：
--
作者：
Haitao Zhao;Bing Zhang;Changshan Wu;Zhengli Zuo;Zhengchao Chen
提出了一种新的坐标变换方法（CT法），将GPS/INS系统的局部切线坐标系的方位角（横摇、俯仰、航向）变换为地图投影坐标系的方位角（Ω、φ、kappa），用于直接地理定位（DG）。特别地，地图投影框架中的方位角由一系列坐标变换导出。通过与传统方法（Legat方法1和POSPac方法2）计算结果的对比，验证了方位角变换的有效性。此外，CT方法也验证了模拟数据。该方法的一个优点是可以在通过坐标变换计算外定向参数位置元素和辅助点坐标的同时获得定向角。这三种方法进行了论证和比较使用的经验数据。实证结果表明，CT方法是合理的和有效的列加特方法。与POSPac方法相比，CT方法更适合于地图投影框架下DG的EO参数计算。CT法和Legat法的DG准确度处于同一水平。由于垂直分量和水平分量的长度投影失真不一致，这三种方法的DG结果在高度上都存在系统误差，采用Legat方法中的EO高度校正技术可以显著减小这些误差。与经验数据所得结果类似，CT方法的有效性也被证明与模拟数据。
This paper develops a novel Coordinate Transformation method (CT-method), with which the orientation angles (roll, pitch, heading) of the local tangent frame of the GPS/INS system are transformed into those (omega, phi, kappa) of the map projection frame for direct georeferencing (DG). Especially, the orientation angles in the map projection frame were derived from a sequence of coordinate transformations. The effectiveness of orientation angles transformation was verified through comparing with DG results obtained from conventional methods (Legat method1and POSPac method2) using empirical data. Moreover, the CT-method was also validated with simulated data. One advantage of the proposed method is that the orientation angles can be acquired simultaneously while calculating position elements of exterior orientation (EO) parameters and auxiliary points coordinates by coordinate transformation. These three methods were demonstrated and compared using empirical data. Empirical results show that the CT-method is both as sound and effective as Legat method. Compared with POSPac method, the CT-method is more suitable for calculating EO parameters for DG in map projection frames. DG accuracy of the CT-method and Legat method are at the same level. DG results of all these three methods have systematic errors in height due to inconsistent length projection distortion in the vertical and horizontal components, and these errors can be significantly reduced using the EO height correction technique in Legat’s approach. Similar to the results obtained with empirical data, the effectiveness of the CT-method was also proved with simulated data.