Andika, Wahyunan (2019) Perbandingan Metode Direct Numerical Integration, Fast Fourier Transform dan Least Square Collocation Dalam Memodelkan Geoid Kota Surabaya. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Earth Gravitational Model 2008 (EGM2008) merupakan model geoid global yang didapatkan dengan kombinasi data gayaberat terestrial, data gayaberat airborne, data satelit gayaberat, dan satelit altimetri. Model geoid EGM2008 untuk wilayah Indonesia memiliki ketelitian yang rendah karena tidak adanya kontribusi data gayaberat lokal. Dalam memodelkan geoid secara gravimetric terdapat 3 metode yang dapat digunaan, yaitu Direct Numerical Integration (DNI), Fast Fourier Transform (FFT) dan Least Square Collocation (LSC). Kota Surabaya merupakan salah satu kota besar di Indonesia belum memiliki model geoid lokal dikarenakan kurangnya data gayaberat terestris. Tujuan dari penelitian ini adalah untuk memodelkan geoid Kota Surabaya dari data gayaberat terestris menggunakan metode DNI, FFT, dan LSC. Dengan kontribusi 143 data gayaberat terestris, untuk geoid yang dihasilkan menggunakan metode DNI mempunyai nilai undulasi maksimal (Nmax) sebesar 29.844 m, nilai undulasi minimal (Nmin) sebesar 28.396 m, dan standar deviasi (σ_N) sebesar 0.321 m. Geoid yang dihasilkan menggunakan metode FFT mempunyai nilai undulasi maksimal (Nmax) sebesar 29.862 m, nilai undulasi minimal (Nmin) sebesar 28.409 m, dan standar deviasi (σ_N) sebesar 0.322 m. Metode LSC menghasilkan geoid dengan nilai undulasi maksimal (Nmax)sebesar 29.879 m, nilai undulasi minimal (Nmin) sebesar 28.423 m, dan standar deviasi (σ_N) sebesar 0.322 m.
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Earth Gravitational Model 2008 (EGM2008) is a global geoid model obtained by a combination of terrestrial gravity, airborne gravity, satellite gravity, and satellite altimetry data. The accuracy of EGM2008 geoid model in Indonesia is still low due the lack of contribution of local gravity data to the model. To develop gravimetric geoid model, there are 3 methods that can be used, namely Direct Numerical Integration (DNI), Fast Fourier Transform (FFT) and Least Square Collocation (LSC). Surabaya is a metropolitan and the second largest city in Indonesia that needs a high accuracy geoid model for the vertical reference system. Currently there is is no local geoid model in Surabaya due to the lack of terrestrial gravity data. The aim of this study is to develop geoid model for Surabaya from terrestrial gravity data by using DNI, FFT, and LSC methods. From 143 terrestrial gravity data, the geoid model from the DNI for has a maximum value (Nmax) of 29.844 m, a minimum value (Nmin) of 28.396 m, a standard deviation (σ_N) of 0.321 m, the Fast Fourier Transform method has a maximum value (Nmax) of 29.862 m, a minimum value (Nmin) of 28.409 m, standard deviation (σ_N) 0.322 m, and the Least Square Collocation method has a maximum value (Nmax) of 29.879 m, a minimum value (Nmin) of 28.423 m, a standard deviation (σ_N) of 0.322 m.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSG 526.3 And p-1 2019 |
| Uncontrolled Keywords: | EGM2008, model geoid, Surabaya, Direct Numerical Integration, Fast Fourier Transform, Least Square Collocation |
| Subjects: | Q Science > QB Astronomy > QB336 Gravity anomalies |
| Divisions: | Faculty of Civil Engineering and Planning > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Wahyunan Andika |
| Date Deposited: | 11 Dec 2023 05:55 |
| Last Modified: | 11 Dec 2023 05:55 |
| URI: | http://repository.its.ac.id/id/eprint/65636 |
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