摘要
坐标转换成果的精度与所选择的坐标转换模型、求转换参数公共点的个数、公共点位置的分布有一定关系。以湘桂线14个GPS测量点的两套CPI精度的控制点平面坐标为依据,分别用相似变换、仿射变换及不同公共点个数求转换参数进行坐标转换,分析成果精度之间的差异及规律。结果表明,为保证坐标转换成果的精度,公共点应均匀地分布在测区,同时转换点不要离公共点太远。公共点的个数以3-5个为宜,一般不要超过6个。对于平面直角坐标之间的转换,采用相似变换模型能收到较好的效果。
The accuracy of coordinate transformation results are influenced by transformational models and the number as well as the position distribution of common points. Based on the 2 sets of CPI-accuracy plane coordinates composed by the 14 GPS control points along the Hunan-Guangxi railroad line, we carried out coordinate transformation using the Similarity Transformation Method and the Affine Transformation Method in different common point numbers and position distributions. Results showed that the common points should distribute evenly in range, the transformation points should not be far away from the common points, and the number of common points selected should be within 3 to 5 to ensure transformation accuracy. Besides, the Similarity Transformation Method is better for plane rectangular coordinates.
出处
《淮海工学院学报（自然科学版）》
CAS
2009年第4期54-56,共3页
Journal of Huaihai Institute of Technology:Natural Sciences Edition
基金
江苏省海洋资源开发研究院科技项目(JSIMR09C06)
关键词
坐标转换
变换模型
公共点
精度
coordinate transformation
transformational model
common points
accuracy
