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Corresponding Author

Hussein A. Abd-Elmotaal

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

In the framework of the IAG 1-cm geoid experiment in Colorado, a detailed gravimetric geoid for Colorado has been computed within this investigation. The geoid has been computed through the window remove-compute-restore technique (Abd-Elmotaal and Kühtreiber, 1999, 2003). The window technique has been chosen because of its unambiguous behaviour of treating the local and global topographic-isostatic masses. The window technique needs the harmonic analysis of the topographic-isostatic masses for the data window to a high-degree. The necessary derivations of the appropriate expressions for the needed dimensionless potential harmonic coefficients of the topographic-isostatic masses within the data window for high-degrees are reviewed. The computation step has utilized the modified Stokes’ kernel for better combination of the Earth’s gravity field wavelengths. The computed geoid has been detrended to the geoid derived by comparing the available GNSS and levelling by applying an offset and two tilt parameters. The results proved that the accuracy of the computed gravimetric geoid is about 5 cm.

Keywords

Window remove-restore technique; high-degree topographic-isostatic harmonic analysis; gravity reduction; geoid determination; modified Stokes' kernel

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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