Experience in constructing a local quasi-geoid surface for the territory of St. Petersburg and its forest park zone

Geodesy
UDC: 
528.242
DOI: 
10.22389/0016-7126-2026-1033-7-2-10
1 Astapovich A.V.
2 Prokofiev A.V.
Year: 
2026
№: 
7
1033
Pages: 
2-10

Military Space academy named after A.F. Mozhaisky (MSА named after A.F. Mozhaisky)

1, 
2, 
Abstract:
A methodology for constructing a local quasi-geoid model by combining the global EGM-2008 one and geometric levelling is presented. GNSS measurements (ITRF-2008) and geometric levelling of classes I–IV were performed at 38 points in St. Petersburg and its forest park area. The local correction to the global model is approximated by a second-order polynomial in plane coordinates; the polynomial parameters are estimated using least squares with weights of the input data. The systematic component of the differences between EGM-2008 and local indicators is 8,6 cm, the random component makes 4,1 cm. The constructed quasi-geoid model has a root mean-square error of 2 cm, and the average influence of parameter mistakes on height anomaly corrections does not exceed 1 cm. The proposed approach transforms GNSS elevations into the Baltic Height System 1977 with the accuracy sufficient for producing topographic plans of any map scale
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Citation:
Astapovich A.V., 
Prokofiev A.V., 
(2026) Experience in constructing a local quasi-geoid surface for the territory of St. Petersburg and its forest park zone. Geodesy and cartography = Geodeziya i Kartografiya, 87(7), pp. 2-10. (In Russian). DOI: 10.22389/0016-7126-2026-1033-7-2-10
Publication History
Received: 10.02.2025
Accepted: 14.05.2026
Published: 20.08.2026

Content

2026 July DOI:
10.22389/0016-7126-2026-1033-7