Dewantary, Irma (2022) Analisis Perbandingan Hasil Deformasi Pada Sentinel-1 Menggunakan Data Precise Orbit Ephemerides (POE) Dan Restituted Orbit File (RES) (Studi Kasus: Gempa Bumi Lombok 5 Agustus 2018). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pulau Lombok merupakan salah satu wilayah Indonesia yang berada di kawasan tektonik aktif. Gempa bumi tanggal 5 Agustus 2018 di Lombok merupakan gempa utama dari rangkaian gempa Lombok 2018 yang menyebabkan adanya deformasi permukaan tanah. Deformasi dapat diukur dengan berbagai teknologi, salah satunya yaitu menggunakan Differential Interferometry SAR (DInSAR). Penelitian sebelumnya telah mengamati deformasi gempa bumi Lombok dengan metode DInSAR namun orbit yang digunakan hanya berfokus pada orbit POE (Precise Orbit Ephemerides) karena orbit POE memiliki akurasi yang paling baik dari orbit lain meskipun tersedia 20 hari setelah akuisisi citra. Dalam penelitian ini dilakukan perbandingan hasil deformasi dengan orbit POE dan orbit RES (Restituted Orbit File) yang memiliki waktu ketersediaan lebih cepat dari orbit POE (3 jam) menggunakan metode DInSAR two-pass interferometry yang memanfaatkan pasangan citra SAR Sentinel 1-A. Kemudian hasil pengolahan yang berbentuk LOS displacement akan dianalisa dan dibandingkan antara orbit POE dan RES. Hasil metode DInSAR pada orbit POE maupun RES menunjukkan deformasi vertikal dengan nilai antara -0,170 m hingga 0,109 m untuk orbit POE dan antara -0,166 m hingga 0,112 m untuk orbit RES. Penggunaan orbit POE dan RES memiliki nilai yang hampir sama dengan beberapa perbedaan seperti nilai hasil pengolahan orbit RES relatif lebih besar daripada orbit POE serta banyaknya blank unwrapping pada pengolahan orbit RES daripada POE. Hasil deformasi dilakukan validasi dengan parameter gempa model okada untuk mengetahui kebenaran atau keakuratan antara penggunaan orbit POE dan RES. Hasil dari orbit POE memiliki nilai RMSE sebesar 0.032959467 m dan korelasi 0.799 sedangkan orbit RES memiliki RMSE sebesar 0.033197054 dan korelasi 0.778 sehingga perbedaan nilai RMSE dan korelasi keduanya relatif kecil dan tidak signifikan. Sehingga penggunaan orbit POE maupun RES dapat diterima dengan kategori yang baik dan berdasarkan penelitian ini, orbit RES dapat digunakan terutama dalam rapid mapping deformasi dengan cukup akurat.
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Lombok Island is one of the regions of Indonesia which is located in an active tectonic area. The earthquake on August 5 2018 in Lombok was the main earthquake in the 2018 Lombok earthquake series which caused deformation of the ground surface. Deformation can be measured by various technologies, one of which is using Differential Interferometry SAR (DInSAR). Previous studies have observed the deformation of the Lombok earthquake with the DInSAR method, but the orbit used only focuses on the POE orbit (Precise Orbit Ephemerides) because the POE orbit has the best accuracy from other orbits even though it is available 20 days after image acquisition. In this study, a comparison of the deformation results with the POE orbit and the RES (Restituted Orbit File) orbit which has a faster availability time than the POE orbit (3 hours) was carried out using the DInSAR two-pass interferometry that utilizes the Sentinel 1-A SAR image pair. Then the processing results in the form of LOS displacement will be analyzed and compared between the POE and RES orbits. The results of the DInSAR method on both POE and RES orbits show vertical deformations with values between -0.170 m to 0.109 m for POE orbits and between -0.166 m to 0.112 m for RES orbits. The use of POE and RES orbits has almost the same value with several differences such as the value of the result of processing the RES orbit is relatively larger than that of the POE orbit and the number of blanks unwrapping in the processing of the RES orbit rather than POE. The deformation results were validated with the okada model earthquake parameters to determine the truth or accuracy between the use of POE and RES orbits. The results of the POE orbit have an RMSE value of 0.032959467 m and a correlation of 0.799 while the RES orbit has an RMSE of 0.033197054 and a correlation of 0.778 so that the difference in the RMSE value and the correlation between the two is relatively small and insignificant. So that the use of POE and RES orbits can be accepted in a good category and based on this research, RES orbits can be used especially in rapid mapping of deformations with quite accuracy.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSG 535.470 287 Dew a-1 2022 |
| Uncontrolled Keywords: | Deformasi, DInSAR, Orbit POE, Orbit RES, Sentinel-1A. Deformation, DInSAR, POE Orbit, RES Orbit, Sentinel-1A. |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 20 May 2026 01:52 |
| Last Modified: | 20 May 2026 01:52 |
| URI: | http://repository.its.ac.id/id/eprint/133251 |
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