Kolwezi大桥GPS施工控制网坐标投影转换研究

Application of Coordinate Projection and Transformation in GPS Control Network of Kolwezi Bridge

坐标投影时的椭球膨胀法、椭球平移法及相似变换法是GPS测量在施工控制网计算时常用的方法,综合运用上述3种方法,提出在椭球膨胀法和椭球平移法的基础上再进行坐标的相似变换,其控制点坐标能更好克服投影变形的影响.通过在南半球工程施工区域GPS测量中的应用,检核了该方法的可行性,成果符合工程施工的规范要求.

Ellipsoid expansion,ellipsoid translation and similar transformation applied in coordinate projection are common methods in GPS survey.The research puts forward the application of similar transformation based on the data calculated from ellipsoid expansion or ellipsoid translation.By this means,the projection distortion of the coordinate is reduced.The method is applied to GPS surveying in southern hemisphere and the result proves that the accuracy of the coordinate lives up to survey specification.