Pemodelan Quasigeoid Lokal Bali dari Data Gayaberat Teristris Menggunakan Formula Hotine
Keywords:
Quasieoid, Formula Hotine, Jarak SpherisAbstract
Quasigeoid lokal pulau Bali di definisikan menggunakan persamaan Hotine. Data yang digunakan kombinasi data gangguan gayaberat hasil pengukuran terestris, gayaberat lautDTU17, EGM2008 derajat 360 dan SRTM15dengan berbagai variasi jarak spheris diuji untuk menghasil quasigeoid teliti. Variasi jarak spherisyangdigunakan sebesar 0.1 , 0.3 , 0.5 , 0.7 , 0.9 , 1.1 , dan 1.3 . Quasigeoid dikoreksi dengan fungsi anomali gayaberat Bouguer untuk mendapatkan model geoid. Validasi geoid dibandingkan dengan 154 titik co-site GNSS/sipat datar teliti sepanjang jalur yang menghubungkan stasiun pasang surut laut Celukan Bawang ke Tanjung Benoa. Hasil perbandingan menunjukkan bahwa geoid dengan jarak spheris 0.9 paling akurat dengan nilai standar deviasi sebesar 20,9 cm. Standar deviasi menunjukkan bahwa terjadi pola penurunan nilai dari jarak spheris 0.3 ke 0.9 . Kondisi tersebut dapat disebabkan karena optimalisasi eliminasi kesalahan trunkasi gangguan gayaberat. Meskipun demikian, penelitian yang lebih komprehensif diperlukan untuk menunjukkan pengaruh hubungan antara jarak spheris dan interval data gayaberat yang tersedia.
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