A Comparative Study of Different Geodetic Boundary Value Solutions for Geoid with reference to its Calibration Using GPS/Leveling Data

M. Sadiq, Z. Ahmad, M. Ayub
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Abstract

The equipotential geoid of the gravity field of the Earth can be modeled with different formulation of the geodetic boundary value problems and their solutions. These techniques range from Helmert's 2nd method of condensation to Residual terrain modeling and then to the Molodenskij solution of the geodetic boundary value problem. The available data for gravity anomalies, elevation and their distribution within Pakistan requires careful study and selection from these solution methods. This study involves the comparison and discussion of different geoid modeling techniques with the geoid determined from GPS / Leveling data. Each of the above mentioned techniques has some advantages and drawbacks due to their data requirement, computational technique and validation of results. This calibration study will help to establish the selection of the suitable method for extended study of geoid model all over Pakistan. These techniques were implemented and tested in central area of Pakistan having diverse landscape with elevation range from 106m to 1522m above mean sea level. A statistical 3D regression model was developed for the compensation of offset between different geoidal solutions.
基于GPS/水准资料标定的大地水准面不同边界值解的比较研究
地球重力场的等势大地水准面可以用不同的大地边值问题及其解的形式来模拟。这些技术范围从Helmert的第二种凝结方法到残差地形建模,再到Molodenskij解决大地测量边值问题。巴基斯坦境内重力异常、海拔及其分布的现有数据需要仔细研究和选择这些解决方法。本研究将不同大地水准面建模技术与GPS /水准资料确定的大地水准面进行比较和讨论。由于数据需求、计算技术和结果验证的不同,每种方法都有各自的优点和缺点。这一校准研究将有助于为巴基斯坦大地水准面模型的扩展研究选择合适的方法。这些技术在巴基斯坦中部地区实施和测试,该地区拥有不同的景观,海拔范围从平均海平面以上106米到1522米。建立了不同大地水准面解间偏移补偿的统计三维回归模型。
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