根据GPS高程的误差来源，分别计算SDCORS静态测量及RTK 高程精度，并按照三、四等水准测量限差要求进行数据统计，计算SDCORS静态测量及RT K高程能满足的水准等级及条件。以某公路控制测量数据为依据进行了精度检核，结果表明：SDCORS静态测量及RT K高程精度与计算结果相吻合。%According to the error sources of GPS elevation ,this paper calculates respec‐tively the elevation accuracy of the SDCORS static observation and SDCORS‐RTK .And this paper statistical data by the tolerance of the 3、4 order leveling surveying ,calculating the conditions that SDCORS can replace the 3、4 order leveling surveying .The results show , taking a road control measurement data as a basis for the accuracy checklist ,the SDCORS static observation and SDCORS‐RTK’s elevation accuracy is consistent with the calculation results.
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