The Use of FFT Method in Geoid Modelling
The paper presents the spectral method known as Fast Fourier Transform (FFT) to compute discrete convolution integrals. Geoid heights are computed by reformulating the Stokes' equation in convolution form and using gridded residual gravity anomalies as input data. Discrete spectra of the kerne...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Fakulti Ukur dan Harta Tanah
1996
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| Online Access: | http://eprints.utm.my/id/eprint/4889/1/TheUse.pdf http://eprints.utm.my/id/eprint/4889/ |
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| Summary: | The paper presents the spectral method known as Fast Fourier Transform (FFT) to compute discrete convolution integrals. Geoid heights are computed by reformulating the
Stokes' equation in convolution form and using gridded residual gravity anomalies as input data. Discrete spectra of the kernel functions are used for the geoid heights
appending simultaneously zero-padding around the input gravity matrix in order to avoid circular convolution effects. This procedure provides identical results to
those from the rigorous numerical integration. The computed quantities are compared to a set of geoid heights derived from a contribution of GPS traverse with levelled orthometric heights. |
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