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All Journal Majalah Forum Teknik UGM JGISE-Journal of Geospatial Information Science and Engineering Jurnal Pengabdian dan Pengembangan Masyarakat
Parseno Parseno
Unknown Affiliation
Humanities Education Engineering Environmental Science Languange, Linguistic, Communication & Media Library & Information Science

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Pengaruh Sudut Vertikal Terhadap Hasil Ukuran Jarak dan Beda Tinggi Metode Trigonometris Menggunakan Total Station Nikon DTM 352 Parseno Parseno; Yulaikhah Yulaikhah
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The measurement of heigh differences using trigonometric technique, and Total Station NikonDTM 352 is used.It is identified that the use of different vertical angle will produce differentheights for the same point. It is interesting to analyse further that, the errors of distance andheight differences in trigonometric technique are as the function of vertical angle. This researchtries to investigate the phenomenom mentioned above: is there sistimatical error? and how tocorect them ?This research is initially arranged to include some steps: (1) preparation of instruments, (2)measurement of distance and height differences in study area using spirit levelling andtrigonometric levelling, (3) Data processing including correction of differences in heightmodelling. Evaluation was carried out by comparing both data of observed height differences.Based on the result of the statistical test, it is found that the variety of vertical angles do notaffect the computed distance and height differences using Total Station. From the data exercisesresulted that the accuracy of height differences is affected by distance and vertical angle,however for the distance up to 800 m, the improvement is not signifcant. In addition the fieldobservations also show that the distance greater than 50m , the contribution of the accuracy ofangle to the change of the accuracy of height differences is greater than the contribution of theaccuracy of the distances.Keywords: height differences,trigonometric levelling, trigonometric technique, Total Station.
GNSS Monitoring Network Optimization Case Study: Opak Fault Deformation, Yogyakarta Nurrohmat Widjajanti; Sherly Shinta Emalia; Parseno Parseno
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.38458

Abstract

Opak fault is a fault located in Opak River area, Bantul. The existence of the fault is one of the biggest causes of earthquake in Yogyakarta in 2006. The seismic potential caused by the active fault requires continuous geodynamic monitoring. The GNSS network (TGD, SGY, and OPK) have been developed since 2013 consists of 17 stations and in 2016 there was an additional number of four monitoring stations. Several high-precision monitoring stations distributed at the fault location are needed to monitor the fault movement. Optimal observation network is one of the factors to obtain high precision station coordinates. The GNSS network optimization has been carried out in the previous research partially on each network; namely the segment of TGD, SGY, and OPK. Therefore, this research conducts a thoroughly optimization for 17 monitoring stations either use old or new stations to obtain an optimal network based on the criteria of accuracy and reliability.The network is designed widely from simple to complex combination and to combination between network segments. The computation uses least squares adjustment with parameter method. The value of the cofactor matrix parameter of the adjustment is applied to analyze the network based on the function of the accuracy criteria, namely A-Optimality, D-Optimality, E-Optimality, S-Optimality, and I-Optimality. Meanwhile, the value of the residual cofactor matrix is used for network configuration analysis based on the reliability objective function, namely the individual redundancy, external and internal reliabilities criteria. The result showed that the design of TGD, SGY and OPK network segments are optimized based on the criteria of accuracy and reliability if they use a network design with a complex baseline. The criteria for accuracy and reliability in the design with a combination of segments such as TGD and SGY, TGD and OPK, as well as TGD, SGY, and OPK are not much different from the optimization results performed by each segment. Therefore, if the measurements are carried out with a limited receiver, it is better to use each of segment designs.
Penentuan Posisi Titik-Titik Pemantauan Banjir Di Desa Segoroyoso, Kecamatan Pleret, Kabupaten Bantul, Provinsi DIY Hilmiyati Ulinnuha; Aris Sunantyo; Bilal Ma'ruf; Parseno Parseno; Nurrohmat Widjajanti; Leni Sophia Heliani; Dwi Lestari; Dedi Atunggal; Cecep Pratama
Jurnal Pengabdian dan Pengembangan Masyarakat Vol 4, No 2 (2021): NOVEMBER 2021
Publisher : Pengabdian dan Pengembangan Masyarakat Sekolah Vokasi UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jp2m.67933

Abstract

Desa Segoroyoso merupakan wilayah yang rawan terhadap adanya bencana alam seperti gempa bumi, banjir, dan tanah longsor. Bencana alam yang sering dialami di Desa Segoroyoso adalah banjir Sungai Opak yang berdampak menggenangi pemukiman warga di Dusun Karanggayam dan Dusun Dahromo I. Sering terjadinya banjir di Desa Segoroyoso membutuhkan penanganan dan mitigasi bencana. Sebagai langkah awal mitigasi banjir, diperlukan titik pantau berupa tanda dilapangan yang mudah diidentifikasi oleh warga tentang elevasi air yang mulai menggenang. Oleh karena itu kegiatan ini bertujuan untuk menentukan posisi horizontal dan vertikal titik pemantauan banjir di Desa Segoroyoso. Titik pemantauan banjir ini diharapkan akan menjadi panduan para warga tentang kemungkinan terjadinya banjir. Posisi horizontal titik pemantau banjir ini akan diukur menggunakan instrumen Global Navigation Satelite System (GNSS) dan posisi vertikal didapatkan melalui pengukuran sipat datar. Hasil dari kegiatan ini adalah koordinat horizontal titik pantau dalam SRGI 2013 serta tinggi orthometriknya.
Co-Authors Aris Sunantyo Bilal Ma'ruf Cecep Pratama Dedi Atunggal Dwi Lestari Heliani, Leni Sophia Nurrohmat Widjajanti Nurrohmat Widjajanti Sherly Shinta Emalia Ulinnuha, Hilmiyati Yulaikhah Yulaikhah