小地区GPS高程拟合和水准测量对比试验

GPS elevation fitting and levelling survey contrast experiment in minor district

结合小地区GPS控制网和二等精密水准网的对比试验,研究了GPS测高技术中高程拟合模型的构建.结合某一地区进行实例分析,选取不同的拟合方案,进行高程内插试验,确定了最优拟合模型.试验结果表明:一定密度的高程点进行拟合,其内插高程精度完全满足工程水准精度要求;平面拟合法的拟合精度可达厘米级,二次曲面拟合法的拟合精度则更高.

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.