A METHOD OF CONTROL GAUSSIAN PROJECTIVE DEFORMATION BASED ON ELLIPSOID AS THE CENTRAL MERIDIAN TO NORMAL SECTION

摘要

This paper develops a method of control Gaussian projection deformation based on Ellipsoid as the central meridian to Normal section, which basic technology is to build a new ellipsoid for the central meridian, the direction of the line extension direction along the same line bearing of trend, centerline projective deformation close to zero.The method includes the following steps: (1)Constructing "normal section meridian ellipsoid E4"; (2) the conversion of rectangular space coordinates from E0 ellipsoid to E4 ellipsoid; (3) Transformation from rectangular space coordinates(XYZ) coordinates to Geodetic Coordinates (BLH) in E4 ellipsoid; (4) Transformation from Geodetic Coordinates to the Gauss projection coordinates in E4 ellipsoid; (5) the computation of projection deformation in E4 ellipsoid; (6) The comparison between calculated results and limited ones.This method can effectively control the length Gaussian projective deformation of the extra-long lines,greatly reducing the number of projection zoning, especially suitable for the not South to North direction, the east-west extra-long route lines.