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Methodology of Euler Rotation Parameter Estimation Using GPS Observation Data Kuncoro, Henri
Indonesian Journal of Geospatial Vol 2, No 1 (2013)
Publisher : Indonesian Journal of Geospatial

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Abstract. Block model assumes that the plate / block is a rigid body and homogeneous so that its movement behavior can be quantified. The movement of this block can be represented by Euler rotation parameters consisting of Euler pole (latitude and longitude of Euler pole) and the rotation rate. Euler pole represent the location of the point is traversed by rotation axis whereas the rotation rate represent the magnitude and direction of the velocity of the block relative to the axis of rotation. This study explain the most effective methodology in the Euler rotation parameter estimation. One example of the application of this methodology is in Henri studyâs (2013), namely the Sunda block rotation parameter estimation. The methodology is explained about Euler rotation parameter estimation from the velocities data, strain analysis for defining the block deformation zone, statistical tests, and velocities transformation between the difference reference frame if the velocities data in difference frame are also included. This methodology is good enough to estimate the Euler rotation parameter for all existing blocks.Keywords : Euler pole, block rotastion, methodology

Analisis Metode GPS Kinematik Menggunakan Perangkat Lunak RTKLIB Kuncoro, Henri; Meilano, Irwan; Anggraeni Sarsito, Dina
Indonesian Journal of Geospatial Vol 2, No 2 (2013)
Publisher : Indonesian Journal of Geospatial

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Abstract. One of the GPS kinematic processing software that developed in the current is RTKLIB. RTKLIB is the software which people can downloaded free and used free for it. This software can also perform data processing in fast and the data processing can be integrated in post-processing and real-time. In this study, the ability of RTKLIB tested by using GPS observation data with variations of the baseline length when earthquake not occured and earthquake offset detection from the GPS baseline processing results during earthquake. In this testing the stability of the GPS data processing results are ascertainable and it can be seen also the ability and reliability of the software in detecting earthquake offset. For comparison of the data processing results quality with RTKLIB, in this study selected TTC (Trimble Total Control) to process the GPS baseline of the same observasions From the results of GPS baseline processing with RTKLIB and TTC, it seems that RTKLIB results have better stability than TTC. In short baseline category have standard deviation less than 1 cm, in medium baseline category have standard deviation between 3-6 cm, whereas in long baseline category have standard deviation 3-8 cm. On the offset detection of earthquake, RTKLIB have ability to detect offset in more of baseline length variations than the TTC.Â Kata Kunci: GPS Kinematik, Offset Gempa, RTKLIBAbstract. One of the GPS kinematic processing software that developed in the current is RTKLIB. RTKLIB is the software which people can downloaded free and used free for it. This software can also perform data processing in fast and the data processing can be integrated in post-processing and real-time. In this study, the ability of RTKLIB tested by using GPS observation data with variations of the baseline length when earthquake not occured and earthquake offset detection from the GPS baseline processing results during earthquake. In this testing the stability of the GPS data processing results are ascertainable and it can be seen also the ability and reliability of the software in detecting earthquake offset. For comparison of the data processing results quality with RTKLIB, in this study selected TTC (Trimble Total Control) to process the GPS baseline of the same observasions From the results of GPS baseline processing with RTKLIB and TTC, it seems that RTKLIB results have better stability than TTC. In short baseline category have standard deviation less than 1 cm, in medium baseline category have standard deviation between 3-6 cm, whereas in long baseline category have standard deviation 3-8 cm. On the offset detection of earthquake, RTKLIB have ability to detect offset in more of baseline length variations than the TTC.Â Kata Kunci: GPS Kinematik, Offset Gempa, RTKLIBÂ

Analisis Pengaruh Jumlah dan Sebaran Ground Control Point (GCP) dalam Proses Ortorektifikasi Citra Satelit Resolusi Tinggi (CSRT) Maharani, Monica; Kuncoro, Henri
Indonesian Journal of Geospatial Vol 5, No 2 (2018)
Publisher : Indonesian Journal of Geospatial

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Penggunaan citra satelit resolusi tinggi (CSRT), tidak terlepas dariproses ortorektifikasi. Badan Informasi Geospasial (BIG) sebagai instansi yangditunjuk oleh pemerintah sebagai penanggung jawab penyediaan informasigeospasial dasar sesuai dengan UU Informasi Geospasial nomor 4 Tahun 2011memanfaatkan Citra Setelit Resolusi Tinggi (CSRT) untuk keperluan pembuatanpeta skala 1:5.000. Proses ortorektifikasi melibatkan CSRT, ground control point(GCP) dan model elevasi digital (MED). Banyaknya proses ortorektifikasi yangtelah dilakukan dengan simulasi jumlah dan sebaran GCP namun tidakmemberikan kepastian besaran pengaruhnya, mendorong perlunya dilakukanpenelitian dan analisis lebih lanjut mengenai pengaruh jumlah dan sebaran GCPpada hasil ortorektifikasi CSRT. Pengolahan data yang dilakukan adalah prosesortorektifikasi citra dengan 7 (tujuh) kali menerapkan simulasi sebaran danjumlah GCP yang berbeda-beda, yaitu 5;9;12;22;32;42;dan 50 buah.Pengurangan GCP dilakukan dengan memperhatikan geometri sebaran GCP agartetap mempertahankan sebaran yang merata, meskipun jumlahnya semakinsedikit. Hasil analisis menunjukkan penambahan jumlah GCP sebanyak 45 GCPdari 5 GCP menjadi 50 GCP ternyata tidak memberikan pengaruh yang besarterhadap keelitian hasil ortomosaik citra. Kenaikan ketelitian hasil ortomosaikcitra yang diperoleh dari penambahan titik sejumlah 50 hanya sebesar 0,2 metersaja.

Identifikasi Mekanisme Sesar di Bagian Timur Pulau Jawa dengan Menggunakan Data GNSS Kontinyu 2010-2016 Kuncoro, Henri; Maharani, Monica
Indonesian Journal of Geospatial Vol 5, No 2 (2018)
Publisher : Indonesian Journal of Geospatial

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Pulau Jawa terletak tepat di utara zona subduksi jawa yang merupakanzona pertemuan Lempeng Indo-Australia dengan Lempeng Sunda. BeberapaSesar terbentuk di Pulau Jawa mengakomodasi stress yang dihasilkan olehsubduksi jawa yang berada di selatan Pulau Jawa. Studi deformasi denganmenggunakan data GNSS telah dilakukan untuk mengestimasi laju geser darisesar-sesar utama di Pulau Jawa. Koulali dkk (2016) mengestimasi laju geseruntuk Sesar Baribis dan Sesar Kendeng sebesar 2.3 – 5.6 mm/tahun dandinyatakan sebagai sesar-sesar aktif. Pada studi ini, 15 data GNSS kontinyu daritahun 2010 hingga 2016 di bagian timur Pulau Jawa digunakan untukmengidentifikasi mekanisme sesar yang berada di wilayah ini meliputi SesarKendeng dan ekstensinya. Data fase GPS dari setiap stasiun GNSS diolahdengan menggunakan GAMIT/GLOBK 10.6 untuk mendapatkan koordinat didalam sistem koordinat kartesian 3D di dalam kerangka referensi InternationalTerrestrial Reference Frame 2008 (ITRF2008). Sebanyak 15 vektor kecepatanGNSS digunakan untuk menghitung strain rate dan laju geser untuk setiapsegmen sesar yang dilalui oleh 3 profil. Ketiga profil tersebut menunjukkanadanya kompresi sebagai akomodasi stress dari subduksi Jawa dan laju geseruntuk segmen barat Sesar Kendeng, segmen timur Sesar Kendeng, danekstensinya sebesar 1.93 mm/tahun, 0.90 mm/tahun, dan 0.60 mm/tahun secaraberurutan dengan mekanisme sesar mengiri. Mekanisme yang sama yang terjadipada ekstensi Sesar Kendeng menunjukkan adanya potensi sumber gempa yangbaru di sekitar Selat Madura. Hal ini merupakan informasi penting untukmengidentifikasi potensi sumber gempa dari Sesar Kendeng dan ekstensinyamengingat zona dari sesar aktif ini merupakan zona yang berpenduduk cukuppadat.

Pengujian Kepresisian Modul GNSS Murah Dual Frequency Pada Pengamatan GNSS Dengan Metode RTK-NTRIP Ratnawati, Efrila Aji; Kuncoro, Henri
REKA GEOMATIKA Vol 2019, No 1
Publisher : Institut Teknologi Nasional

AbstrakGNSS berkembang dengan pesat seiring berkembangnya zaman. Dominasi dari receiver GNSS tipe geodetik memiliki kekurangan, yaitu terkait permasalahan biaya (cost issue) yang tinggi. Permasalahan biaya tersebut dapat diatasi dengan pengembangan Original Equipment Manufacturer boards (OEM-boards) yang memerlukan biaya murah untuk menjadi modul GNSS yang bisa digunakan untuk pengukuran RTK-NTRIP. Penelitian ini bertujuan menguji tingkat kepresisian dari modul GNSS murah dual frequency untuk pengukuran metode RTK-NTRIP dengan panjang baseline 0,1 km, 2 km, 10 km, dan 20 km. Pengukuran dilakukan berdasarkan New International Standard ISO 17123-8:2015 yang terdiri dalam Â tiga tahap, yaitu pengukuran menggunakan receiver GPS geodetik metode statik, pengukuran menggunakan modul GNSS murah dual frequency, dan pengukuran menggunakan receiver geodetik metode RTK-NTRIP. Kepresisian Â ditentukan berdasarkan simpangan baku horizontal dan vertikal, diuji menggunakan Simplified Test Procedure. Tingkat kepresisian yang dihasilkan modul GNSS murah tergolong tinggi, untuk komponen horizontal berkisar antara 8 mm s.d. 3 cm dan vertikal antara 7 mm s.d. 3 dm. Nilai kepresisian horizontal telah memenuhi standar yang ditetapkan oleh New International Standard ISO 17123-8:2015, sedangkan komponen vertikal tingkat kepresisiannya terbatas pada baseline kurang dari 10 km.Kata kunci: Panjang baseline, modul GNSS murah; tingkat kepresisianAbstractGNSS was a technology that grows rapidly. Unfortunately, most of geodetic GNSS receivers had disadvantages related to the cost issue. Original Equipment Manufacturer boards (OEM-boards) could be developed as low cost GNSS modules which is used for RTK-NTRIP measurements to overcome the cost problem. This research was objected to Â measure the level of Â precision from dual-frequency GNSS modules of the RTK-NTRIP method, tested on baselines with 0.1 km, 2 km, 10 km, and 20 km length Based on New International Standard ISO 17123-8: 2015 measurements were established with three stages, static measurement with geodetic GPS receiver, measurement with cheap dual-frequency GNSS modules, and RTK-NTRIP measurements with geodetic GPS receiver. Precision was determined based on horizontal and vertical standard deviation and tested using the Simplified Test Procedure. It was founded that low cost GNSS modules could achieved the the high-level precision, 8 mm to 3 cm for horizontal component and 7 mm to 3 dm for the vertical. Horizontal precision had reached the New International Standard ISO 17123-8: 2015, while the vertical precision still could be reached the standard with limitation, i.e. for baselines with less 10 kilometers length.Keywords: baseline length, low cost GNSS modules, level of precision

Comparison of Local Geoid Models Using Fast Fourier Transform and Least Squares Collocation in the Remove-Compute-Restore Scheme: A Case Study of Pangkal Pinang Kuncoro, Henri; Novandi Resya Riandika
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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The geoid model is crucial for all nations as the primary height reference. Given that numerous countries have developed their geoid models, local geoid modelling is essential for Indonesia. According to the Indonesian Geospatial Reference System (SRGI 2013), which encompasses the national height reference system, it is indicated that not all areas of Indonesia possess a geoid model with a high degree of accuracy. The geoid modelling in Indonesia has been conducted incrementally. In local geoid modelling utilizing gravimetric techniques, specifically within the Remove Compute Restore (RCR) framework, two approaches for ascertaining residual undulation are the Fast Fourier Transform (FFT) Method and the Least Squares Collocation (LSC) Method. This study examines a comparison of the two methods, focusing on the accuracy of the geoid model and the factors that affect its precision. This study's findings demonstrate that the least squares collocation geoid model is the most precise geoid model in the Pangkal Pinang region and its vicinity, achieving an accuracy of ±0.131 m. The accuracy of the Fast Fourier Transform method is ±0.149 m for the 2D Spherical Multiband FFT approach and ±0.159 m for Haagman's 1D Spherical FFT approach.

Utilization of PS-InSAR for Analyzing Land Subsidence in the Bandung Basin, Indonesia using Sentinel-1A Data SARI, DEWI KANIA; KUNCORO, HENRI; NURTYAWAN, RIAN
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 4: Published October 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i4.1116

ABSTRAK Cekungan Bandung, yang terletak di Provinsi Jawa Barat, Indonesia, rentan terhadap penurunan muka tanah. Penelitian ini menganalisis laju penurunan muka tanah di Cekungan Bandung selama tahun 2019 menggunakan metode PS-InSAR yang diterapkan pada citra satelit Sentinel-1A. Sebanyak delapan citra Sentinel1A, yang diperoleh antara Januari hingga Desember 2019, diproses menggunakan perangkat lunak SNAP dan STAMPS. Hasil analisis menunjukkan bahwa laju deformasi permukaan tanah di Cekungan Bandung berkisar dari -133 hingga 98 mm/tahun, dengan penurunan paling signifikan terjadi di Kota Bandung dan Kabupaten Bandung. Perbandingan hasil PS-InSAR dengan data survei GPS dari sembilan titik pemantauan menunjukkan korelasi yang kuat (R=0,75), mengonfirmasi keandalan metode PS-InSAR untuk pemantauan penurunan tanah. Temuan ini menegaskan pentingnya pemantauan berkelanjutan dan pengelolaan sumber daya secara bijak guna mengurangi dampak penurunan muka tanah di Cekungan Bandung. Kata kunci: penurunan muka tanah, PS-InSAR, Cekungan Bandung, Sentinel-1A ABSTRACT The Bandung Basin, located in West Java Province, Indonesia, is highly susceptible to land subsidence. This study analyzes land subsidence rates in the Bandung Basin during 2019 using the PS-InSAR method applied to Sentinel-1A satellite imagery. Eight Sentinel-1A images, acquired between January and December 2019, were processed using SNAP and STAMPS software. The results indicate that deformation rates in the Bandung Basin range from -133 to 98 mm/year, with the most significant subsidence occurring in Bandung City and Bandung Regency. A comparison between PS-InSAR measurements and GPS survey data from nine monitoring points revealed a strong correlation (R=0.75), confirming the reliability of the PS-InSAR method for land subsidence monitoring. These findings underscore the need for continuous monitoring and sustainable resource management to mitigate land subsidence in the Bandung Basin. Keywords: land subsidence, PS-InSAR, Bandung Basin, Sentinel-1A

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