COMBINED METHOD FOR DATUM TRANSFORMATION CONSIDERING STOCHASTIC ERROR AND LOCAL DEFORMATION
顾及随机误差和局部变形误差的坐标组合转换法

The different coordinate systems mean different geophysical concept.In the geodetic network the local deformation and accumulation error exist,and there are stochastic value in the common points with the different coordinate.So the coordinate transformation from low precise coordinate frame to the high one can not approve a high precise reference frame after this transformation.A combined method based on variance component estimation using similarity transformation and regressive approximating is presented.For the local error accumulation and distortion and the stochastic value of the common points,the accuracy of coordinate system is improved after the transformation with the combined method from Xi’an Geodetic Coordinate System 1980(XAS80) to China Geodetic Coordinate System 2000(CGCS2000).