| Title |
Comparison between FFT and LSC Method for the Residual Geoid Height Modeling in Korea |
| Keywords |
Remove-Restore (R-R) technique;FFT method;LSC method;residual geoid height;geoid model;Remove-Restore(R-R) 기법;FFT 방법;LSC 방법;잔여지오이드고;지오이드 모델 |
| Abstract |
In this study, we performed the residual geoid modeling using the FFT and LSC methods in context of application of R-R (Remove and Restore) technique as a general technique for gravimetric geoid model in order to propose the effective way of geoid determination in Korea. For this, a number of data compiled for residual geoid modeling by the multi-band spherical FFT method with Stoke"s formula and LSC method as known as statistical method. The geometric geoidal heights obtained from 503 GPS/Levelling data were used for inducing the various elements and proper computation process which should be considered for improving the accuracy of residual geoid modeling. Finally, we statistically compared the results of residual geoid heights between FFT and LSC methods and reviewed then the proper way of residual geoid modeling to the region of Korea. As the results of comparison, LSC method is not suitable for residual geoid modeling in Korea due to the noise and lack of gravity observations and the effects of local characteristics, while FFT method by applying Stokes" integral with proper cap size and modified kernel which provides the better accuracy of residual geoid heights up to 10 em more than those of LSC method. |