Application of Ellipsoid Deformation Model in the Establishment of Independent Coordinate System
In order to solve the problem of length deformation out of limit,the reference-ellipsoid should be re-selected when the inde-pendent coordinate system is established,that is,to perform a certain ellipsoidal transformation on the reference-ellipsoid.As one of the ellipsoid transformation methods,ellipsoid deformation model(EDM)has the advantage that it can directly use the national stand-ard geodetic coordinates without coordinate correction,and obtain independent coordinates by Gaussian projection on the new reference-ellipsoid.This paper establishes an independent coordinate system using the ellipsoidal deformation model through detailed theoreti-cal derivation and case analysis,and evaluates the construction effect.The results show that the model has the characteristics of simple calculation and high accuracy,which has certain reference significance for the selection of models for establishing independent coordi-nate systems.
ellipsoid deformation modellength deformationCGCS2000independent coordinate system
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