Taking GPS C network,surveying control achievement from Baotou to Jining and geometric leveling data,the linear fitting and curve fitting are adopted to fit height.Compared with leveling precision,the hierarchical network GPS fitting height can reach four and other geometric leveling precision.%利用已有的包头至集宁GPS C级网测量的控制测量成果的GPS实测数据和几何水准资料作为已知数据,利用线性拟合法、曲面拟合法对GPS高程拟合,通过与水准高程的精度对比分析,论述该等级网GPS拟合高程可以达到四等几何水准测量的精度。
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