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All Journal Indonesian Journal of Geospatial Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences GEA, Jurnal Pendidikan Geografi JURNAL ILMIAH GEOMATIKA Bulletin of Geology
Heri Andreas
Kelompok Keahlian Geodesi, Institut Teknologi Bandung
Astronomy Chemistry Earth & Planetary Sciences Education Energy Engineering Mathematics Physics

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Journal : Bulletin of Geology

 1 
EFEK AKURASI DAN GEOMETRIK SISTEM TINGGI DIGITAL ELEVATION MODEL (DEM) TERHADAP PEMODELAN BAHAYA BANJIR ROB DI JAKARTA Juliandri, Firman; Andreas, Heri; Pradipta, Dhota
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2022.6.2.2

Abstract

Penelitian ini bertujuan untuk mengetahui efek akurasi DEM terhadap hasil pemodelan bahaya banjir rob di Jakarta dengan membandingkan hasil pemodelan menggunakan beberapa data DEM yang memiliki variasi akurasi. Model berbasis DEM LiDAR yang memiliki akurasi tinggi dijadikan baseline untuk pengukuran akurasi model lainnya. Pemodelan dengan DEMNAS menghasilkan luas area tergenang yang mendekati model DEM LiDAR dengan rasio perbandingan sebesar 97%. Pemodelan DEM global (open access), terdiri dari DEM SRTM (30 m), DEM TanDEM-X (60 m), dan DEM AW3D (30 m), menghasilkan luas area tergenang yang memiliki variasi antara 5% - 48% dari model DEM LiDAR. Pemodelan menunjukkan korelasi positif antara akurasi vertikal dan resolusi spasial DEM dengan akurasi produk model bahaya banjir rob di Jakarta. Perbandingan antar model secara lebih lanjut dilakukan untuk mendapatkan efek akurasi model terhadap hasil penilaian risiko bencana banjir rob. Penggunaan model DEM global yang berakurasi rendah menghasilkan nilai risiko jumlah penduduk terpapar sebesar 2,2 - 54,0 kali lebih rendah, serta nilai risiko kerugian ekonomi sebesar 1,9 - 37,6 lebih rendah dibandingkan penilaian risiko menggunakan model berbasis DEM LiDAR. Kata kunci: DEM, Jakarta, pemodelan banjir rob, penilaian risiko
ORTHOMETRIC HEIGHT DETERMINATION IN JAKARTA AND SUNDA STRAIT AREA USING THE GEOPOTENTIAL NUMBER APPROACH Sarsito, Dina Anggreni; Bramanto, Brian; Andreas, Heri; Pradipta, Dhota; Triwibowo, Sidiq
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2024.8.1.2

Abstract

Orthometric height is a physical height type used by Indonesia in local/national reference systems for determining positions used in various scientific and engineering activities. The main constraint in determining orthometric height is that it is theoretically difficult to realize that gravity measurements must be carried out along the plumb lines that connect the topographic equipotential surface with the geoid surface. Another constraint is that it requires precise physical height difference measurementsfrom tie points, which are usually located in coastal areas, to locations on land that are far from the coast. This research examines the possibility of determining orthometric physical height at several GNSS stations in the Jakarta and Sunda Strait areasusing the geopotential number approach as an alternative solution to the difficulties caused by the aforementioned constraints. The first type of orthometric height obtained from GNSS geodetic height observations with geoid undulation obtained from the EGM2008 global gravity model is then used as a comparison for the second type of orthometric height obtained from the geopotential number approach. The pattern of geopotential numbers on the islands of Java and Sumatra has the same pattern, namely that the value increases as the topographic elevation increases. This phenomenon is in line with the terrestrial survey approach carried outso far, that the meansea level can be assumed to be an estimate of the geoid surface, which is used as a reference for the gravity potential surface. The average difference in height between the two types of orthometric height is 0.39 meters, with a difference interval between -1.80 meters and 2.73 meters. The results obtained show that the geopotential number approach can be used as an alternative for determining orthometric height if direct gravity measurements and/or precise physical height difference measurements cannot be carried out in the monitoring area. Key words: Orthometric, Geopotential Number, Geoid, Jakarta, Sunda Strait.
Co-Authors Abidin, Hasanuddin Zainal Akhmad Riqqi, Akhmad Bramanto, Brian Bramanto, Brian Buldan Muslim Cecep Subarya Dhota Pradipta, Dhota Dina A. Sarsito Dina A. Sarsito Dina A. Sarsito, Dina Dina Anggreni Sarsito Dinar Maulana Dinni Sanni Hafidzah, Dinni Sanni Dirga Maulansyah Guwandi Gamal, Mohamad Guwandi, Dirga Maulansyah Hasanuddin Z Abidin, Hasanuddin Z Hasanuddin Z. Abidin Hasanuddin Z. Abidin Hasanuddin Z. Abidin Irwan Gumilar, Irwan irwan meilano Juliandri, Firman Kosasih Priyatna, Kosasih Kusuma, Mipi Ananta Kusuma, Mipi Ananta M. Gamal M. Gamal M. Hendrasto Mipi Ananta Kusuma Muhammad Gamal Muhammad Hendrasto NURUL YUHANAFIA Oni K. Suganda Ony K. Suganda The Houw Liong Trihantoro, Nur Fajar Triwibowo, Sidiq Utomo, Dwi Wahyu Wedyanto Kuntjoro