Phalosa, Ellena Feodora (2025) Penentuan Model Geoid Gravimetrik Pulau Sulawesi Berdasarkan Data Gayaberat Airborne, Terestris, dan Model Geoid Global (GOCO06s) Metode Least Square Collocation. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Peraturan Kepala Badan Informasi Geospasial (Perka BIG) Nomor 15 Tahun 2013 menetapkan geoid sebagai bidang referensi vertikal di Indonesia. Geoid merupakan bidang ekipotensial yang secara matematis berhimpit dengan muka air laut rerata dalam kondisi ideal. Saat ini Indonesia memiliki model geoid resmi yaitu INAGEOID2020 V2.0 yang dihitung dengan menambahkan data free air dari EGM2008 n = 2190 pada daerah yang tidak dapat diukur menggunakan airborne maupun terestris. Namun, model geoid di beberapa daerah di Indonesia masih belum memadai dan mencapai ketelitian yang diharapkan. Pada penelitian ini dilakukan pada area studi Pulau Sulawesi yang memiliki kondisi topografi yang cukup bervariasi. Data yang digunakan berupa kombinasi data gayaberat dari airborne terestris, SRTM15+, DTU17, serta model geoid global GOCO06s, dan diharapkan dapat menghasilkan model geoid yang lebih akurat dan representatif untuk model geoid gravimetrik Pulau Sulawesi. Penggunaan Teknik remove-compute-restore dan metode Least Square Collocation serta model geoid global yang berbeda diharapkan dapat meningkatkan akurasi estimasi geoid dengan memanfaatkan kombinasi data yang optimal. Pemodelan geoid gravimetrik Pulau Sulawesi dilakukan menggunakan metode Least Square Collocation menggunakan tiga komponen gelombang yaitu gelombang panjang, menengah, dan pendek. Hasil penelitian menunjukkan bahwa variasi terbaik diperoleh pada degree GOCO06s sebesar 210 yaitu pada variasi D1 dan D2, dengan ketelitian masing-masing sebesar 0,05813 m dan 0,05832 m. Selain itu, penggunaan kombinasi data topografi resolusi tinggi (SRTM15+ dan SRTM 1 arc second) menghasilkan model geoid yang lebih akurat dibandingkan penggunaan SRTM15+ secara tunggal. Pemilihan data topografi dan derajat MGG memiliki pengaruh cukup signifikan terhadap ketelitian pemodelan geoid lokal, khususnya pada wilayah dengan variasi medan yang kompleks seperti Pulau Sulawesi.
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Regulation of the Head of the Geospatial Information Agency (Perka BIG) No 15 of 2013 establishes the geoid as the vertical reference surface in Indonesia. The geoid is an equipotential surface that mathematically coincides with the average sea level under ideal conditions. Currently, Indonesia has an official geoid model, INAGEOID2020 V2.0, calculated by adding free air data from EGM2008 n = 2190 in areas that cannot be measured using airborne or terrestrial methods. However, the geoid model in some regions of Indonesia is still inadequate and does not achieve the desired accuracy. This study was conducted in the Sulawesi Island study area, which has a varied topography. The data used consists of a combination of gravity data from airborne and terrestrial sources, SRTM15+, DTU17, and the global geoid model GOCO06s, and is expected to produce a more accurate and representative geoid model for the Sulawesi Island gravimetric geoid model. The use of the remove-compute-restore technique, the Least Square Collocation method, and different global geoid models is expected to improve the accuracy of geoid estimation by utilizing an optimal combination of data. The gravimetric geoid modeling of Sulawesi Island was conducted using the Least Square Collocation method with three wave components: long, medium, and short waves. The research results indicate that the best variation was obtained at a GOCO06s degree of 210, specifically at variations D1 and D2, with accuracies of 0.05813 m and 0.05832 m, respectively. Additionally, the use of high-resolution topographic data combinations (SRTM15+ and SRTM 1 arc second) produced a more accurate geoid model compared to using SRTM15+ alone. The selection of topographic data and MGG degree significantly influences the accuracy of local geoid modeling, particularly in regions with complex terrain variations such as Sulawesi Island.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Gayaberat, Model Geoid, Least Square Collocation, Sulawesi, Gravity, Geoid Model, Least Square Collocation, Sulawesi |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System G Geography. Anthropology. Recreation > G Geography (General) > G70.217 Geospatial data G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing G Geography. Anthropology. Recreation > GA Mathematical geography. Cartography > GA139 Digital Elevation Model (computer program) G Geography. Anthropology. Recreation > GB Physical geography Q Science > QB Astronomy > QB336 Gravity anomalies |
| Divisions: | Faculty of Civil Engineering and Planning > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Ellena Feodora Phalosa |
| Date Deposited: | 25 Jul 2025 03:11 |
| Last Modified: | 25 Jul 2025 03:11 |
| URI: | http://repository.its.ac.id/id/eprint/121456 |
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