DEVELOPMENT OF A LOCAL QUASI-GEOID MODEL OF ALMATY CITY USING THE FAST COLLOCATION METHOD
АЛМАТЫ ҚАЛАСЫНЫҢ ЖЕРГІЛІКТІ ГЕОИД МОДЕЛІН ЖЫЛДАМ КОЛЛОКАЦИЯ ӘДІСІМЕН ӘЗІРЛЕУ
Seisenbekovich U.A. Assygatovna S.D. Serikzhanuly K.M. Nurlankyzy Z.N.
2025National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2025#2025Issue 5282 - 300 pp.
In mountainous regions with pronounced gravity-field heterogeneity and complex topography, global geopotential models fail to deliver the required centimeter-level height consistency, while geometric leveling is economically and technologically demanding. Accordingly, a locally optimized quasigeoid model that reflects regional gravity and topographic features is needed. This study develops a high-accuracy and computationally efficient local quasigeoid using Fast Collocation. The long-wavelength component is taken from XGM2019e_2159, topographic effects are accounted for with the FABDEM DEM, and the short-wavelength signal is reconstructed from 14,061 terrestrial gravity points. The workflow includes rational data screening against ground measurements, covariance-function parameterization accounting for heterogeneity, outlier suppression, and regularization to ensure robustness under sparse coverage. Validation against independent GNSS/leveling benchmarks yields RMSE = 0.055 m and STD = 0.048 m, more than twice as accurate as global solutions EGM2008 and XGM2019e_2159. The resulting model enables stable, high-precision transformation of GNSS ellipsoidal heights to normal heights, contributing to the regional height system and providing a practical basis for engineering-geodetic, land management, and cadastral applications.
digital elevation model , Fast Collocation , global geopotential model , height anomaly , orthometric height , quasi-geoid
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Institute of Ionosphere, Almaty, Kazakhstan
K.I. Satbayev Kazakh National Research Technical University, Almaty, Kazakhstan
International Educational Corporation, Almaty, Kazakhstan
Institute of Ionosphere
K.I. Satbayev Kazakh National Research Technical University
International Educational Corporation
10 лет помогаем публиковать статьи Международный издатель
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