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When topographic survey and staking out structures of civil and industrial works using GNSS - RTK technology, the normal height of the detail points are usually determined according to the geodetic height of the base station and the geodetic height difference measured and height anomalies are interpolated; the normal height of the points staked out are usually determined according to the normal height of the base station and the geodetic height difference between the base station and the point staked out. In the paper, we studied the solutions of height anomaly interpolation of detail points, according to the GNSS control points with normal height; determine the allowable distance from the base station to the stake out point of civil and industrial works when applying GNSS - RTK technology, meeting the technical requirements of these tasks. The author has also studied the method of Geoid height interpolation at the points in the 1' × 1' grid of the earth gravity model EGM-2008. According to the similarity relationship between the difference of height anomaly and Geoid height difference, the difference of normal height is determined, from which calculating the normal height of the detail point is used for topographic survey in civil and industrial construction. Keywords: normal height; height anomaly; GNSS - RTK technology; civil and industrial construction.

Xác định dị thường độ cao trong đo vẽ bản đồ địa hình và bố trí công trình dân dụng - công nghiệp bằng công nghệ GNSS-RTK