Results 21 to 30 of about 914 (138)
Geoid model validation and topographic bias
Journal of Geodetic Science, 2022 Recently a number of geoid campaigns were performed to verify different types of geoid and quasigeoid modeling techniques. Typically, GNSS-leveling was employed as an independent method, but in some cases zenith camera astronomic deflection data were ...
Sjöberg Lars E.
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Development of a precise local quasigeoid model for the city of Krakow – QuasigeoidKR2019
Reports on Geodesy and Geoinformatics, 2020 A geoid or quasigeoid model allows the integration of satellite measurements with ground levelling measurements in valid height systems. A precise quasigeoid model has been developed for the city of Krakow.
Banasik Piotr +3 more
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The Quasigeoid: Why Molodensky Heights Fail
, 2023 AbstractAny height system has two constituents: A reference surface upon which all heights are equal to zero, and a prescription for how observed heights and height differences will be related to that surface. That prescription is typically formulated with reference to Earth’s gravity field, but in this contribution, we will use the concept of metric ...
Robert Kingdon +4 more
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GPS-derived geoid using artificial neural network and least squares collocation [PDF]
, 2006 The geoidal undulations are needed for determining the orthometric heights from the Global Positioning System GPS-derived ellipsoidal heights. There ore several methods for geoidal undulation determination.
Ambrožič, Tomaž +3 more
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Geodetski Vestnik, 2022 This study aims to analyze the quality of several local reference quasigeoid surfaces obtained from several Global Geopotential Models (GGM) relative to the official quasigeoid solution of Serbia (SQM2011) and GNSS/dh observations for the territory of ...
Marko D. Stanković +2 more
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Determination of correlation coefficient between geoid-to-quasigeoid separation calculated by the satellite data in Sjöberg’s equation and GPS/Levelling method [PDF]
Geodesy and Cartography, 2018 In this paper, two techniques for calculating the geoid-to-quasigeoid separation are employed. One of them is GPS/Levelling customary method as a criterion where the geoid undulation and height anomaly are computed by subtracting the ellipsoid height ...
Ata Eshaghzadeh +2 more
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An experimental Indian gravimetric geoid model using Curtin University’s approach [PDF]
, 2021 Over the past decade, numerous advantages of a gravimetric geoid model and its possible suitability for the Indian national vertical datum have been discussed and advocated by the Indian scientific community and national geodetic agencies.
Balasubramanian, Nagarajan +4 more
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Quasigeoid cục bộ và quasigeoid toàn cầu
Tạp chí Khoa học Đo đạc và Bản đồ, 2010 Như đã biết, dị thường độ cao xác định theo số liệu trọng lực bằng các phương pháp tích phân số, biến đổi Furie nhanh, collocation v.v… liên quan tới quasigeoid toàn cầu tương ứng với hệ thống tham khảo toàn cầu và mặt đẳng thế trung bình trên qui mô toàn cầu đi qua một điểm khởi tính.
Hoàng Lân Phạm, Yu. M Neyman
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Absolute performance of AUSGeoid09 in mountainous regions [PDF]
, 2014 The Australian Height Datum (AHD) is the current national vertical datum for Australia, and AUSGeoid09 is the latest quasigeoid model used to compute (normal-orthometric) AHD heights from Global Navigation Satellite System (GNSS) derived ellipsoidal ...
Gibbings, P, Janssen, V, Sussanna, V
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The geoid or quasigeoid – which reference surface should be preferred for a national height system?
Journal of Geodetic Science, 2013 Most European states use M. S. Molodensky’s concept of normal heights for their height systems with a quasigeoid model as the reference surface, while the rest of the world rely on orthometric heights with the geoid as the zero-level.
Sjöberg L. E.
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