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All Journal Indonesian Journal of Geography GEA, Jurnal Pendidikan Geografi JURNAL ILMIAH GEOMATIKA Communications in Science and Technology BHUMI: Jurnal Agraria dan Pertanahan International Journal of Remote Sensing and Earth Sciences (IJReSES) JGISE-Journal of Geospatial Information Science and Engineering Jurnal Nasional Teknologi Terapan Jurnal Teknik Sipil Kokoh Geoid - Journal of Geodesy and Geomatics
Nurrohmat Widjajanti
Departemen Teknik Geodesi, Fakultas Teknik, Universitas Gdjah Mada
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Mathematics Social Sciences Transportation

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PENGEMBANGAN JARING KONTROL GEODESI PEMANTAU WADUK SERMO Waliyanto, Waliyanto; Widjajanti, Nurrohmat; Yulaikhah, Yulaikhah; Taftazani, M. Iqbal
GEOMATIKA Vol 21, No 2 (2015)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.113 KB) | DOI: 10.24895/JIG.2015.21-2.581

Abstract

Keberadaan Waduk Sermo di Kabupaten Kulonprogo, sangat penting karena manfaatnya sebagai tampungan air bersih, sarana pariwisata dan saluran irigasi untuk lahan pertanian di sekitarnya. Namun demikian banyak juga yang tidak menyadari bahwa di bawah Waduk Sermo terdapat segmen sesar aktif yang memanjang dari Parangtritis ke Kulonprogo. Penelitian ini bermaksud untuk mengembangkan jaring pengamatan yang telah ada sebelumnya menjadi lebih luas cakupannya untuk mengetahui dampak dari adanya sesar aktif tersebut. Penelitian dilaksanakan dengan beberapa tahapan, yaitu: 1) pengembangan kerangka kontrol, dengan menambah tujuh titik (5 makro dan 2 mikro) jaring kontrol baru; 2) pengukuran kerangka kontrol, dengan menggunakan pengamatan GPS/GNSS metode relatif statik di semua titik kontrol sejumlah 15 titik; 3) pengolahan data, dengan menggunakan perangkat lunak GAMIT/GLOBK dan diolah dalam dua skenario terkait penggunaan titik referensi dalam pengolahan. Hasil dari penelitian ini adalah terbangunnya pilar/patok jaring pemantauan baru sebagai pengembangan jaring kontrol pemantauan Waduk Sermo, serta koordinat jaring kontrol hasil olahan dalam dua skenario, yaitu: pada skenario pertama, titik makro memiliki simpangan baku terkecil yaitu 0,004 m pada sumbu Z di titik MAK2. Sedangkan pada titik mikro, simpangan baku terkecil sebesar 0,004 m pada sumbu Z di titik BBR1 dan BMS2. Pada skenario kedua, simpangan baku titik makro terkecil yaitu 0,001 m pada sumbu X di titik MAK1. Sedangkan pada titik mikro, simpangan baku terkecil sebesar 0,005 m pada sumbu Z di titik BMS2. Titik-titik yang sudah dibangun dapat bermanfaat untuk memantau pergerakan bendungan dan secara berkala bisa digunakan untuk memantau aktivitas sesar yang berada di bawah Waduk Sermo.Kata kunci: pengembangan JKG, pemantau Waduk Sermo, teknik GPS/GNSS
ESTIMASI KOORDINAT TITIK KONTROL PEMANTAUAN DEFORMASI BENDUNGAN SERMO DENGAN METODE PARAMETER BERTAHAP DARI DATA BASELINE HASIL PENGOLAHAN GAMIT Affriani, Asri Ria; Widjajanti, Nurrohmat; Yulaikhah, Yulaikhah
Jurnal Pendidikan Geografi Gea Vol 19, No 2 (2019)
Publisher : Indonesia University of Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/gea.v19i2.20715

Abstract

Bendungan Sermo merupakan suatu bangunan struktur yang berfungsi sebagai penampung air untuk air bersih, irigasi pengairan, serta pencegah banjir di Kabupaten Kulon Progo. Oleh karena pentingnya bangunan tersebut, perlu dilakukan pemantauan guna mendeteksi adanya deformasi. Adanya pergerakan geodinamik, perluasan area pemantauan, dan deteksi retakan tanah (crack) memerlukan penambahan jumlah titik kontrol pemantauan deformasi. Penambahan titik kontrol dalam suatu pengukuran dapat mempengaruhi ketelitian hasil pengolahan data sehingga memerlukan strategi khusus pengolahan data. Oleh karena itu, digunakan hitung perataan metode parameter bertahap. Tujuan dari penelitian ini adalah teridentifikasi nilai koordinat 3D dan perbedaan ketelitian titik kontrol pemantaun deformasi yang dihasilkan dari pengolahan dengan metode parameter bertahap serta teridentifikasi signifikansi perbedaan koordinat dan ketelitian hasil pengolahan metode parameter bertahap dengan hasil pengolahan dengan perangkat lunak GAMIT/GLOBK.Penelitian ini menggunakan data pengamatan GNSS 10 titik kontrol pemantauan deformasi Bendungan Sermo yang diukur pada day of year (doy) 250 tahun 2014 selama ± 2 jam dan doy 129 tahun 2015 ± 8 jam. Pengolahan data dilakukan dengan perangkat lunak GAMIT untuk mendapatkan panjang baseline dan ketelitiannya dengan pengikatan lokal pada enam stasiun CORS BIG. Nilai panjang baseline dan ketelitiannya digunakan sebagai input dalam pengolahan dengan hitung perataan parameter bertahap sehingga dihasilkan nilai koordinat titik kontrol pemantauan deformasi dan ketelitannya. Pada perataan bertahap tahap pertama digunakan lima titik kontrol dengan satu titik dianggap fixed. Perataan bertahap tahap kedua ditambahkan lima titik kontrol. Analisis yang dilakukan meliputi analisis perbedaan ketelitian pada titik kontrol pemantauan hasil pengolahan data dengan metode parameter bertahap dan perbandingan koordinat 3D hasil pengolahan metode parameter bertahap dengan hasil pengolahan GAMIT/GLOBK.Analisis perbedaan ketelitian hasil pengolahan data menggunakan metode parameter bertahap menunjukkan bahwa terdapat peningkatan ketelitian pada kelima titik kontrol yang diolah pada tahap pertama. Peningkatan ketelitian berkisar antara 0,193 cm s.d. 5,450 cm. Berdasarkan uji perbandingan dua varian sampel, ketelitian hasil pengolahan tahap pertama berbeda signifikan dengan ketelitian hasil pengolahan tahap kedua. Hasil uji signifikansi beda dua parameter menunjukkan bahwa hasil pengolahan koordinat 3D dengan metode perataan bertahap tidak berbeda signifikan dengan hasil pengolahan dengan perangkat lunak GAMIT/GLOBK secara statistik.
Analisis Pengaruh Gempa Tektonik 10 Juli 2013 Terhadap Perubahan Koordinat Stasiun Pantau Segmen Mentawai Ulinnuha, Hilmiyati; Sunantyo, Aris; Widjajanti, Nurrohmat
Jurnal Nasional Teknologi Terapan (JNTT) Vol 3, No 1 (2019): JULI
Publisher : Penelitian dan Pengabdian Kepada Masyarakat Sekolah Vokasi Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (243.824 KB) | DOI: 10.22146/jntt.37493

Abstract

Mentawai Segment is located in Mentawai Islands, Sumatra, Indonesia. This segment is a subduction zone between Indo-Australian plate and Eurasian plate. This subduction zone can lead to high potential of tectonic earthquake in Mentawai Segment. The high potential of tectonic earthquake has negative impact for the community, so it is necessary to monitor the risk of tectonic earthquake in Mentawai Segment. This monitoring can be done by using GPS data of monitoring station that spread in Mentawai Segment. Therefore, this research aims to analyze the effect of tectonic earthquake on the coordinate change of Mentawai Segment, so that it can reduce the risk of negative impact of tectonic earthquake in Mentawai Segment. This research use observation data of 10 continuous GPS monitoring station (Sumatran GPS Data Array / SuGAr) in Mentawai Segment. Day of observation data was day of year (doy) at the time of tectonic earthquake occurence on July 10, 2013. Data processing used GAMIT / GLOBK software. The results of this research indicate that the tectonic earthquake (July 10, 2013) affected coordinates changes of the SuGAr station significantly two hours after the tectonic earthquake occurred.
GPS-DERIVED SECULAR VELOCITY FIELD AROUND SANGIHE ISLAND AND ITS IMPLICATION TO THE MOLUCCA SEA SEISMICITY Heliani, Leni Sophia; Pratama, Cecep; Parseno, Parseno; Widjajanti, Nurrohmat; Lestari, Dwi
GEOMATIKA Vol 26, No 2 (2020)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24895/JIG.2020.26-2.1199

Abstract

Sangihe-Moluccas region is the most active seismicity in Indonesia. Between 2015 to 2018 there is four M6 class earthquake occurred close to the Sangihe-Moluccas region. These seismic active regions representing active deformation which is recorded on installed GPS for both campaign and continuous station. However, the origin of those frequent earthquakes has not been well understood especially related to GPS-derived secular motion. Therefore, we intend to estimate the secular motion inside and around Sangihe island. On the other hand, we also evaluate the effect of seismicity on GPS sites. Since our GPS data were conducted on yearly basis, we used an empirical global model of surface displacement due to coseismic activity. We calculate the offset that may be contained in the GPS site during its period. We remove the offset and estimate again the secular motion using linear least square. Hence, in comparison with the secular motion without considering the seismicity, we observe small change but systematically shifting the motion. We concluded the seismicity in the Molucca sea from 2015 to 2018 systematically change the secular motion around Sangihe Island at the sub-mm level. Finally, we obtained the secular motion toward each other between the east and west side within 1 to 5.5 cm/year displacement.
The Effect of Baseline Component Correlation on the Design of GNSS Network Configuration for Sermo Reservoir Deformation Monitoring Yulaikhah Yulaikhah; Subagyo Pramumijoyo; Nurrohmat Widjajanti
Indonesian Journal of Geography Vol 51, No 2 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (146.707 KB) | DOI: 10.22146/ijg.44914

Abstract

The condition of the geological structure in the surrounding Sermo reservoir shows that there is a fault crossing the reservoir. Deformation monitoring of that fault has been carried out by conducting GNSS campaigns at 15 monitoring stations simultaneously. However, those campaigns were not well designed. With such a design, it took many instruments and spent much money. For the next GNSS campaign, it should be designed so that the optimal network configuration is obtained and the cost can be reduced. In the design of deformation monitoring network, sensitivity criteria become very important for detecting the deformations. In GNSS relative positioning, the baseline components are correlated, but this correlation is often ignored. This research examined the effect of baseline component correlations on the design results of the GNSS configuration of the Sermo Fault network based on sensitivity criterion. In this case, the western side of the fault was taken as a reference, while the other side as an object moving relatively against the western side. This study found that the baseline component correlation affects the results of GNSS network configuration. Considering the correlation could result a sensitive network configuration with a fewer baseline; therefore, the cost and time of field surveys can be reduced. It can be said that the baseline component correlation needs to be taken into account in the configuration design of deformation monitoring network.
Determination of a Local Hybrid Geoid as a Height Reference System for 3D Cadastre Margaretha Elya Lim Putraningtyas; Leni Sophia Heliani; Nurrohmat Widjajanti; Trias Aditya
Indonesian Journal of Geography Vol 53, No 2 (2021): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.55219

Abstract

Use and development of vertical building(s) on land parcel(s) have been a common progress to many urban landscapes around the world. 3D cadastre has been a research area that involves legal, technical and institutional assessments to the use and development of vertical buildings. Initial Land Registration of 3D cadastre objects require a representative geometry to determine the legal boundaries of 3D objects. For that purpose, a height reference that is used to define 3D geometries of registered 3D cadastre objects is important. This study focuses in determining a height reference system by developing a local hybrid geoid for the representation of 3D cadastre. The local hybrid geoid was developed by fitting the gravimetric to the geometric geoid.  Four strategies were utilized, based on the combination of GGM’s SGG-UGM-1 and GO_CONS_GCF_2_SPW_R5, Remove-Compute-Restore method and control point distribution for geoid fitting. Based on comparison with geometric geoid at six independent control points, the local hybrid geoid from strategy 3 produces mean difference of 0.354 m, accuracy of 0.137 m and increased level of closeness of 86%, which is further applied as an alternative reference surface in 3D cadastre.
PENENTUAN NILAI PERGERAKAN VERTIKAL PADA TITIK PANTAU DEFORMASI DI KOMPLEK CANDI PRAMBANAN Widya Hanifazza; Nurrohmat Widjajanti
Kokoh Vol 20, No 1 (2022): Kokoh : Volume 20, Issue 1, Tahun 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (980.637 KB)

Abstract

Prambanan Temple is one of the largest Hindu temples in Indonesia that has been declared one of the world heritage sites by UNESCO in 1991. The soil structure underneath the temples consists of Young Mount Merapi and sand sediments characterized as a light structure. It can shift quickly, making Prambanan Temple susceptible to vertical movements. Geodetic measurement was held periodically using Total Station, but there has not been any comprehensive analysis for the vertical movements. The study generated computation for the vertical movements of the monitoring point located on the body of the Prambanan Temple. Then an analysis of the vertical movement was generated. This computation uses observations data of the vertical angles and horizontal distance for the first- period (2019) and the second-period measurement (2020) from the deformation monitoring points spread across six temples in the yard of Prambanan Temple. The height value (Z) and standard deviation are computed using a general least square adjustment method. The vertical deformation is analyzed by a statistical test which consists of a significance test for different parameters and a single point displacement test using a confidence level of 95%. Furthermore, analysis of the vertical movement velocity is carried out at each monitoring point. The result is the Z value for the second-period measurement along with its precision, the value of vertical movement, and the velocity of vertical movement at each monitoring point. The Z value obtained in the second-period measurement has a standard deviation value of less than 4 mm, ranging from 0,322 to 3,096 mm.
SISTEM TINGGI DALAM REALISASI KADASTER 3D DI INDONESIA: TANTANGAN, PERMASALAHAN DAN ALTERNATIF SOLUSI Leni S Heliani; M. Ellya Putriningtias; Nurrohmat Widjajanti
BHUMI: Jurnal Agraria dan Pertanahan No. 38 (2013)
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat, Sekolah Tinggi Pertanahan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (600.869 KB) | DOI: 10.31292/jb.v1i38.170

Abstract

One important componentin the3Dcadastral system isthe definition of height component. The height of a cadastralobjectis the height above a certain height reference field. Based on theconceptandits use, there aremany height reference fields.Each reference field will have a certain effect on the type of height system and on the corresponding precision. Theabsoluteheightisdefinedin reference to thenationalheight reference, which provides certaintyandcleargeometricandtopologicalrelationsfor3Dcadastralobjects. However, the ideal nationalheight reference field,in this case precisegeoidmodels has not been definedfor thewhole of Indonesia.An alternativesolution to the problem uses a definition ofalocalgeoidmodel or the use ofa high-resolutionglobalgeoidmodel, the EGM2008. In the implementation, the precision level ofthe available geoid model and the required precision level of cadastral objects height become the basis for the selection of ageoid model. The use ofthe geoid modelasthe height reference has also an impact on theoptimalization/development of theapplication of BPNCORSstationsthatcan beusedas ahorizontal as well as a verticalreferencepointin3Dcadastralmapping.Keywords: 3D cadastre, cadastral mapping, geoid.
GEOMETRIC ASPECTS EVALUATION OF GNSS CONTROL NETWORK FOR DEFORMATION MONITORING IN THE JATIGEDE DAM REGION Made Ditha Ary Sanjaya; T. Aris Sunantyo; Nurrohmat Widjajanti
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 15, No 2 (2018)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1322.407 KB) | DOI: 10.30536/j.ijreses.2018.v15.a2901

Abstract

Many factors led to dam construction failure so that deformation monitoring activities is needed in the area of the dam. Deformation monitoring is performed in order to detect a displacement at the control points of the dam. Jatigede Dam deformation monitoring system has been installed and started to operate, but there has been no evaluation of the geometry quality of control networks treated with IGS points for GNSS networks processing. Therefore, this study aims to evaluate the geometric quality of GNSS control networks on deformation monitoring of Jatigede Dam area. This research data includes the GNSS measurements of five CORS Jatigede Dam stations (R01, GG01, GCP04, GCP06, and GCP08) at doy 233 with network configuration scenarios of 12 IGS points on two quadrants (jat1), three quadrants (jat2), and four quadrants (jat3 and jat4). GNSS networks processing was done by GAMIT to obtain baseline vectors, followed by network processing usingparameter method of least squares adjustment. Networks processing with least squares adjustment aims to determine the most optimal  by precision and reliability criterion. Results of this study indicate that network configuration with 12 IGS stations in the two quadrants provides the most accurate coordinates of CORS dam stations. Standard deviations value of CORS station given by jat1 configuration are in the range of 2.7 up to 4.1 cm in X-Z components, whereas standard deviations in the Y component are in the range 5.8 up to 6.9 cm. An optimization assessment based on network strength, precision, and reliability factors shows optimum configuration by jat1.
Correlation of GNSS Observation Data Quality Resulted from TEQC Checking and Coordinate’s Precision Yulaikhah Yulaikhah; Subagyo Pramumijoyo; Nurrohmat Widjajanti
Jurnal Geospasial Indonesia Vol 1, No 1 (2018): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.38387

Abstract

GPS Positioning provides good coordinate accuracy that is up to a millimeter. However, some error sources such as multipath, atmospheric conditions and obstruction can reduce the quality of data and also coordinates. To minimize errors due to these factors, at the time of determining the station location, it is necessary to pay attention to the surrounding conditions, namely by looking for open areas and avoiding objects that can reflect GNSS signals. However, it is often not easy to find the ideal observation station location, which forms a good chain while being free from obstruction and multipath. Therefore, it is often necessary to prioritize certain factors over other factors. Information about the correlation between multipath, ionospheric conditions and the recording level of observational data on coordinate accuracy can be used as consideration in determining the location of control points for deformation monitoring and determining which factors are prioritized. This study aims to evaluate the correlation between data quality and coordinates precision.The used observation data are Sermo Reservoir control network and nine CORS BIG stations. The component data analyzed are multipath (MP1, MP2), ionospheric effects (IOD slips and IOD or MP slips) and the data recording level (obs). These components were resulted by checking with TEQC software, while the precision of the coordinates was obtained by processing with GAMIT / GLOBK software. Based on the correlation coefficient value, it is known that the recording level of observation data has the strongest correlation with a negative direction (ranging from -0.7 to -0.9). It is the ratio between the number of real observations to the number of possible ones. One factor that influences it is the obstruction in the field. In other words, in determining the location of GNSS observation stations, the conditions of obstruction in the vicinity need to be considered and prioritized.
Co-Authors Affriani, Asri Ria Aris Sunantyo Atunggal, Dedi Azizi, Iqbal Hanun Cecep Pratama Dwi Lestari Dwi Lestari Fitri, Listiyo Heliani, Leni Sophia Himawan, Iwan Qodar Krishna Fitranto Nugroho M. Ellya Putriningtias Made Ditha Ary Sanjaya Margaretha Elya Lim Putraningtyas Muhammad Iqbal Taftazani Novie Chiuman Parseno Parseno Parseno Parseno Parseno Parseno Sherly Shinta Emalia Sitaningrum, Alya Subagyo Pramumijoyo Subagyo Pramumijoyo Sunantyo, Aris T. Aris Sunantyo Trias Aditya Trias Aditya, Trias Ulinnuha, Hilmiyati Ulinnuha, Hilmiyati Waliyanto Waliyanto, Waliyanto Widya Hanifazza Yulaikhah Yulaikhah