GNSS leveling method research suitable for third and fourth order level requirements in engineering surveying

In response to the problem of traditional level measurement being inefficient and the geodetic heights obtained from static GNSS measurement being left unused, this paper investigates the methods and relevant measures to improve the accuracy of elevation measurement. The author initially develops the dual model software for calculating height anomaly through the selection of model combinations. Then, the author proposes the corresponding observation requirements in satellite positioning static measurement on the basis of the technical standards of the third and fourth order leveling, and achieves the third order level accuracy in satellite static measurement through on-site verifications in multiple places across the country. The experimental results of the study show that, for elevation control measurement tasks of third order level accuracy and below in the field of engineering measurement, the dual model height anomaly calculation software can conveniently facilitate the completion of such measurement tasks together with plane control measurement and fulfil the static measurement requirements specified in this paper.