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All Journal Journal of Food and Pharmaceutical Science Indonesian Journal of Geography Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Journal of Geoscience, Engineering, Environment, and Technology JURNAL ILMIAH GEOMATIKA AKSIOLOGIYA : Jurnal Pengabdian Kepada Masyarakat Elipsoida : Jurnal Geodesi dan Geomatika BHUMI: Jurnal Agraria dan Pertanahan JGISE-Journal of Geospatial Information Science and Engineering Jurnal Pengabdian dan Pengembangan Masyarakat Journal of Food and Pharmaceutical Sciences Geoid - Journal of Geodesy and Geomatics Jurnal Pertanahan
Heliani, Leni Sophia
Departemen Teknik Geodesi, Fakultas Teknik, Universitas Gadjah Mada
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Journal : JGISE-Journal of Geospatial Information Science and Engineering

 1 
Perbandingan Pergerakan Titik Pantau Deformasi Kepulauan Sangihe Menggunakan Metode Perhitungan Periodik dan Simultan Berdasarkan Data GNSS Tahun 2014, 2015, dan 2016 Fauzi, Muhammad Arsyad; Heliani, Leni Sophia
Jurnal Geospasial Indonesia Vol 3, No 1 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.53068

Abstract

The study of deformation monitoring point movement of Sangihe Islands was conducted using the GNSS measurement methods. One of the factor that determines the accuracy of the deformation monitoring is the utilized data processing methods. Therefore, this research analyze the comparison of deformation monitoring point movement of Sangihe Islands using periodic and simultaneous GNSS data processing methods. This research used three observations epochs of GNSS, i.e. 2014, 2015 and 2016. The observational data were processed using GAMIT/GLOBK software that tied to ITRF 2014 to produce coordinates and their accuracy. Based on the coordinate data and its accuracy, the velocity of movements calculation and their accuracy was done using the periodic and simultaneous methods. Based on the periodic method, the velocity of the SGH1 point on the N component is -1,11 ± 2,72 mm/year, on the E component is 9,21 ± 4,17 mm/year, and on the U component is -15,02 ± 50,64 mm/year, while the velocity of the SGH3 point on the N component is -4,93 ± 1,56 mm/year, on the E component is 16,50 ± 2,47 mm/year, and on the U component is -6,69 ± 19,42 mm/year. Based on the simultaneous method, the velocity of the SGH1 point on the N component is -1,56 ± 1,25 mm/year, on the E component is 9,40 ± 1,55 mm/year, and on the U component is -11,54 ± 5,83 mm/year, while the velocity of the SGH3 point on the N component is -5,18 ± 0,88 mm/year, on the E component is 16,91 ± 1,10 mm/year, and on the U component is -2,84 ± 3,49 mm/year. This research proves the hypothesis that the simultaneous GNSS data calculation results in higher accuracy than the periodic method.
GPS Technology Implementation for Sangihe Islands' Movement Monitoring in 2017-2019 Hilmiyati Ulinnuha; Dwi Lestari; Leni Sophia Heliani; Nurrohmat Widjajanti; Cecep Pratama; Parseno Parseno; Krishna Fitranto Nugroho
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.51033

Abstract

Sangihe Islands belong to a complex tectonic area at the subduction of the Eurasian plate and the Philippine Sea. Sangihe subduction zones are complex subduction zone, so that there is a need for continuous movement monitoring. Previous research had been carried out to monitor movement of the Sangihe subduction zone, but no monitoring has been done in 2019. Therefore, this study aims to monitor movement of Sangihe subduction zones with the latest observation data.This study aims to obtain velocity of Sangihe Islands plate movement during 2017 to 2019. Observation was performed using 3 monitoring control points for 7 days in 2019. While observation data from 2017 to 2018 were obtained from previous studies. Observations was carried out using GNSS differential method technology. Loosely constrained of weighted parameter was performed in least square adjustment of GNSS data daily processing, while Kalman Filtering algorithm applied for combining multiyear GNSS data to estimate the velocity refer to ITRF 2014 using GAMIT/GLOBK.This study indicates that Sangihe Islands has horizontal movement to the Southeast with velocity vector of 1 to 2.16 cm/year. This results confirm the previous studies in that area.
Analysis of Sangihe Islands Movements derived from Recent GPS Observation Krishna Fitranto Nugroho; Leni Sophia Heliani
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.51146

Abstract

Sangihe Islands is one of the districts located in the border region of the Republic of Indonesia precisely located in North Sulawesi Province which borders with the Philippines. Sangihe subduction zone is a subduction between the Sangihe plate and the Maluku sea plate. (Di Leo, et al., 2012). This situation causes the Sangihe Islands region to be very prone to earthquake and others disasters, so mitigation efforts are needed to minimize casualties and losses in other material forms. One of these efforts is mapping the potential of earthquakes through Geodynamic studies which are represented at the point of deformation control. This study is using four times GNSS observations epoch 2015, 2016, 2017 and 2018 tied to ITRF 2014. The data used for 3D deformation analysis with the multiepoch method to calculate the movement speed of the Sangihe plate and simultaneous tectonic plate strain observation. The results of this study are the coordinates and accuracy values of monitoring point also the plate movement speed and annual tectonic plate strain values. The movement speed of the Sangihe plate is SGH1 point is having horizontal deformation of 9.88 mm / year to the southeast and vertical deformation descend by 58.66 mm/year. SGH3 point is having horizontal deformation of 12.74 mm/year to the southeast and vertical deformation descend by 18.51 mm/year. SGH4 point is having horizontal deformation of 19.04 mm/year to the southeast and vertical deformation descend by 5.27 mm/ year. This research also proves the hypothesis of a change in the volume of the Sangihe Islands tectonic plate based on the values of normal strain parameters and shear strain in the fraction of 10-6 to 10-4 strains.
Perbandingan Pergerakan Titik Pantau Deformasi Kepulauan Sangihe Menggunakan Metode Perhitungan Periodik dan Simultan Berdasarkan Data GNSS Tahun 2014, 2015, dan 2016 Muhammad Arsyad Fauzi; Leni Sophia Heliani
Jurnal Geospasial Indonesia Vol 3, No 1 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.53068

Abstract

The study of deformation monitoring point movement of Sangihe Islands was conducted using the GNSS measurement methods. One of the factor that determines the accuracy of the deformation monitoring is the utilized data processing methods. Therefore, this research analyze the comparison of deformation monitoring point movement of Sangihe Islands using periodic and simultaneous GNSS data processing methods. This research used three observations epochs of GNSS, i.e. 2014, 2015 and 2016. The observational data were processed using GAMIT/GLOBK software that tied to ITRF 2014 to produce coordinates and their accuracy. Based on the coordinate data and its accuracy, the velocity of movements calculation and their accuracy was done using the periodic and simultaneous methods. Based on the periodic method, the velocity of the SGH1 point on the N component is -1,11 ± 2,72 mm/year, on the E component is 9,21 ± 4,17 mm/year, and on the U component is -15,02 ± 50,64 mm/year, while the velocity of the SGH3 point on the N component is -4,93 ± 1,56 mm/year, on the E component is 16,50 ± 2,47 mm/year, and on the U component is -6,69 ± 19,42 mm/year. Based on the simultaneous method, the velocity of the SGH1 point on the N component is -1,56 ± 1,25 mm/year, on the E component is 9,40 ± 1,55 mm/year, and on the U component is -11,54 ± 5,83 mm/year, while the velocity of the SGH3 point on the N component is -5,18 ± 0,88 mm/year, on the E component is 16,91 ± 1,10 mm/year, and on the U component is -2,84 ± 3,49 mm/year. This research proves the hypothesis that the simultaneous GNSS data calculation results in higher accuracy than the periodic method.
Pengaruh Densitas Topografi Terhadap Ketelitian Model Geoid: Studi kasus Pulau Sulawesi Heliani, Leni Sophia; Noviantara, Hendra
Jurnal Geospasial Indonesia Vol 7, No 2 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.102122

Abstract

Penentuan model geoid teliti penting untuk mendapatkan tinggi ortometrik dari tinggi Global Navigation Satellite System (GNSS).   Salah satu faktor yang mempengaruhi ketelitian model geoid adalah densitas topografi. Umumnya, penentuan model geoid pada formula Stokes menggunakan densitas massa standar sebesar 2670 kg/m3. Namun, densitas topografi sesungguhnya  bervariasi. Saat ini, tersedia model densitas global, salah satunya yang dibuat University of New Brunswick (UNB) dengan resolusi 30”. Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan densitas topografi dari densitas standar dan model global UNB terhadap ketelitian model geoid yang dihasilkan. Pemodelan geoid  menggunakan metode Kungliga Tekniska Högskolan (KTH), dengan studi kasus Pulau Sulawesi, salah satu pulau yang memiliki variasi topografi yang sangat tinggi. Hasil validasi menggunakan data co-site GNSS-levelling menunjukan perubahan ketelitian yang tidak signifikan pada level milimeter, untuk geoid menggunakan densitas standar (NStandar) dan model global UNB (NUNB). Nilai standar deviasi dan RMS dari model NStandar sebesar 12,65 cm. Sedangkan nilai standar deviasi dan RMS dari model NUNB sebesar 12,58 cm dan 12,59 cm. Hal ini dikarenakan titik-titik validasi terletak pada lokasi dengan topografi yang tidak terlalu bervariasi. Selanjutnya, dilakukan pendetailan hitung perbedaan nilai geoid NStandar dan NUNB, diperoleh selisih antara -20 s.d. 30 cm di wilayah pegunungan. Perbedaan dalam level desimeter ini menunjukan efek yang signifikan dari densitas topografi terhadap ketelitian geoid, sehingga tidak bisa diabaikan, terutama untuk wilayah dengan variasi topografi yang tinggi.
Co-Authors Ahmad Sarwadi Ahmad Sarwadi, Ahmad Al Shida Natul Aqso, Muhammad Raihan Aris Sunantyo Bagas Triarahmadhana Bilal Ma'ruf Cecep Pratama Dedi Atunggal Dewanto, Bondan Galih Dwi Lestari Dwi Lestari Dwi Lestari Dwi Lestari Fauzi, Muhammad Arsyad Hadianti, Atrida Hidayat Panuntun Juswono Budi Setiawan Krishna Fitranto Nugroho Krishna Fitranto Nugroho Latif Sahubawa Listyana, Deswita M. Ellya Putriningtias Margaretha Elya Lim Putraningtyas Muhammad Arsyad Fauzi Noviantara, Hendra Novianti, Suci Tresna Nurrohmat Widjajanti Nurrohmat Widjajanti Parseno Parseno Parseno Parseno Parseno Parseno Parseno Parseno Partosuwiryo1, Suwarman Pratama, Cecep Pratama, Rizki Febri Putraningtyas, Margaretha Elya Lim Putri, Citra Kumala Rendra Fauzi Rosdiana Sanjaya, Darmawan Dwi Setiawan, Juswono Budi Suci Tresna Novianti Suwarman Partosuwiryo1 Suyanta Suyanta Trias Aditya Ulinnuha, Hilmiyati Ulinnuha, Hilmiyati Ustadi Widjajanti , Nurrohmat Widy Putra Widya Nayati Widya Nayati Wiwit Suryanto