ACCURACY OF COORDINATE TRANSFER INFLUENCED BY DIFFERENT DISTRIBUTIONS OF COMMON POINTS
1）College of Surveying and Geoinformatics, Tongji University, Shanghai 200092
2）Key Laboratory of Modern Engineering Surveying, SBSM, Shanghai 200092
Abstract In order to calculate the transformation of Cartesian coordinates, we need to know the two sets of coordinates of the common points, select different common points to establish the corresponding error equation and obtain the 7parameters or 13parameters of the transformation. We made the research on comparing estimated points calculated by transformation parameters with designed points in outerspace and innerspace around these common points through the simulation of 165 survey points in 11 rows and 15 columns of two sets coordinates. Taking the Euclid distance of the two sets of points as the basic surface fitting data to establish the surface model for calculating accuracy and with modified Shepard’s method, we have abtained some general distribution law about the accuracy of calculating coordinate points.
