3D SPACE COORDINATE SYSTEM TRANSFORMATION CONSIDERING
GEODETIC ELEVATION ERROR
1)Engineering Research Center of Coal Mining Exploration,Suzhou University,Suzhou 230000
2)School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221008
Abstract In the transformation from national referenceellipsoidcentric coordinate to national geocentric coordinate, the lack of precise geodetic elevation of control points in referenceellipsoidcentric coordinate makes the rectangular space coordinates of control points contain error. And this factor has an impact on final conversion accuracy. Up to late the 3D space coordinate model based on least squares has not taken into account the
influence. In this paper,we discuss the method of 3D space coordinate transformation based on total least squares, besides, compare the methods of coordinate transformation based on total least squares and least squares used known data.The result shows that the accuracy of the former is better than the later.
