GPS elevation fitting and levelling survey contrast experiment in minor district

By contrast test between the GPS control network and the second-order precision levelling network of a minor district,this project is aiming at study on the elevation fitting model establishment by GPS elevation survey teachnigue.With a specific district case analysis,employing several methods to fit the GPS elevation and the elevation interpolating by experiments,the optimal fitting model of the district was obrained,and were gotten following conclusions.The GPS elevation fitting model with certain elevation point density can satisfy the requirement of the general engineering construction;The precision of the model based on the plane fitting method can reach the centimeter order,and the model based on the quadratic curved surface fitting can get even higher precision.