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All Journal REKA GEOMATIKA Indonesian Journal of Geospatial JURNAL ILMIAH GEOMATIKA MAJALAH ILMIAH GLOBE
Kosasih Prijatna, Kosasih
ITB
Earth & Planetary Sciences Education Mathematics

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Temporal Variation Analysis From Troposphere Delay Using GPS (Study: Bandung, Indonesia) Pradipta, Dhota; Kuntjoro, Wedyanto; Prijatna, Kosasih
Indonesian Journal of Geospatial Vol 1, No 1 (2012)
Publisher : Indonesian Journal of Geospatial

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Abstract.Tropospheric delay is the amount of distortion caused by the deceleration of satellite’s signal propagation due to the influence of troposphere. The value of this delay is certain effect of elevation angle that is called the slant delay. In the processing of GPS signals correction, the value of slant delay will be converted using a mapping function to the measured value of the zenith delay which became known as the Zenith Total Delya (ZTD). Zenith value is an accumulated value of the tropospheric delay along the signal’s path at the zenith direction. The value of ZTD can be determined by GPS technique. In Geodesy, ZTD is a nuisance parameter, but for meteorology, it is a parameter of interest, which causes from variability of the atmospheric constituens. The section of ZTD, i.e. Zenith Wet Delay (ZWD), could be derived by substracting Zenith hydrostatic Delay (ZHD) component from ZTD. By surface temperature readings at the GPS receiver, the retrieved ZWD can then be transformed with additional uncertainty into an estimate of the Precipitable Water Vapor (PWV). The aim of this research is to study temporal behavior of PWV at ITB campus, as it is revealed from GPS measurements. According to the research that has been conducted, we obtained some results, i.e. The data quality and strategy which were used in processing could affect the result, In particular, we found that, within 20 minutes, maximum and minimum PWV values could reach 85.2 mmand 6.4 mm, respectively. It may indicate that the atmosphere above the studied are varies highly. Temporal condition in observation point that appears in result such as at 12.00 – 18.00 WIB often shows significant irregular anomalies of PWV that influenced local area observation. Keywords: GPS, PWV, temporal analysis, ZTD. 
Steric And Eustatik Effect Contributions To Sea Level Change Based On Altimetry Satellite Argo And Grace Satellite Data Within 1992-2012 Period (The Study Area: The Western Pacific Ocean) Hartanto, Prayudha; Lestari Nurmaulia, Sella; Prijatna, Kosasih
Indonesian Journal of Geospatial Vol 2, No 1 (2013)
Publisher : Indonesian Journal of Geospatial

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Abstract. The change of sea level in the western Pasific Ocean is one of the biggest change in the world. This is caused by steric and eustatic factors. In the period of 1992-2012, the total change of sea level in this area based on the Topex/Poseidon satellite data, Jason 1 and Jason 2, was 6. 982 ± 3.493 mm/year. Based on the temperature and salinity from Argo floats for the period 2000 – 2013,  the obtained high streic changes in sea level in the region is about 14.352 ± 13.002 mm/year. The result is a based on high steric sea level relative to 900 dbar pressure. To find the rise of eustatic sea level that caused by the changes in ocean mass, linear regression performed on the data Equivalent Water Thickness (EWT) of monthly GRACE satellites in the period January 2004 to April 2013. The magnitude of the linear trend EWT changes in this area is -0.4026 ± 0.1073 mm/year. This study concludes that the correlation between EWT and the SLA value is more significant than the correlation between high steric sea level and SLA. But further investigation is needed to determine the factor that contributes more to changes of sea level in the study area. This occurs due to the presence of still considerable correlation between the high steric sea level and ocean mass which is the independent variable in the equation of total sea level . To minimize these correlations , observations required high steric and ocean mass with a longer time span. Keywords : The change of sea level, steric, eustatic, the western Pasific Ocean, linear trend 
PERUBAHAN MUKA AIR LAUT BERDASARKAN DATA SATELIT ALTIMETRI DAN DATA ARGO PADA RENTANG 1992-2012 DI WILAYAH SAMUDERA PASIFIK BAGIAN BARAT Hartanto, Prayudha; Prijatna, Kosasih; Nurmaulita, Sella Lestari
MAJALAH ILMIAH GLOBE Vol 16, No 1 (2014)
Publisher : Badan Informasi Geospasial

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ABSTRAKWilayah Samudera Pasifik bagian barat merupakan salah satu wilayah yang mengalami kenaikan muka laut tertinggi di dunia. Data satelit altimetri Topex/Poseidon Jason 1 dan Jason 2, pada kurun waktu tahun 1992-2012, menunjukkan rata-rata kenaikan muka laut di area ini adalah 6,982 ± 3,493 mm/tahun. Sebagai pembanding, perubahan muka laut di wilayah ini pun dihitung berdasarkan data suhu dan salinitas dari pelampung Argo. Data suhu dan salinitas yang digunakan berada pada rentang waktu tahun 2000 – 2013. Perubahan tinggi muka laut berdasarkan data pelampung Argo adalah 14,352 ±13.002 mm/tahun. Tinggi muka laut ini merupakan komponen sterik dari total perubahan muka air laut. Tinggi sterik muka air laut merupakan ketebalan vertikal di atas sebuah lapisan ketebalan h dari anomali volume tertentu dan dapat dihubungkan dengan medan densitas lautan. Berdasarkan hasil penelitian ini, maka dapat disimpulkan bahwa ekspansi termal lautan merupakan penyebab utama perubahan/kenaikan muka laut global. Pada masa yang akan datang, penggunaan data pengamatan pelampung Argo dapat dikembangkan untuk memantau perubahan muka laut global maupun regional.Kata Kunci: perubahan muka laut, altimetri, Argo, muka laut sterikABSTRACTThe Western Pacific Ocean has the highest sea level rise rate on the world. The Topex/Poseidon, Jason 1 and Jason 2 satellite altimetry data shows the average of sea level rise in this area during the 1992-2012 period was 6.982 ± 3.493 mm/annually. As a comparison, changes in the sea level in this area was calculated based on temperature and salinity data from Argo floats. The temperature and salinity data used were collected during the period of 2000-2013. Changes in the sea level based on Argo floats data was 14.352 ± 13,002 mm/annually. This Argo-based sea level is a steric component of the total sea level changes. The steric sea level height is a volume anomaly of a vertical thickness above a layer of thickness h and can be attributed to ocean density field. Based on these results, it can be concluded that the thermal expansion of the oceans is a major cause of global sea level rise. In the future, the usage of Argo floats observation data can be directed to monitor the changes in global and regional sea level.Keywords: sea level change, altimetry, Argo, steric sea level
pyGABEUR-ITB: A FREE SOFTWARE FOR ADJUSTMENT OF RELATIVE GRAVIMETER DATA Wijaya, Dudy Darmawan; Muhamad, Norman Arif; Prijatna, Kosasih; Sadarviana, Vera; Sarsito, Dina A.; Pahlevi, Arisauna; Variandy, Erfan D.; Putra, Widy
GEOMATIKA Vol 25, No 2 (2019)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (584.303 KB) | DOI: 10.24895/JIG.2019.25-2.991

Abstract

pyGABEUR-ITB (Python GayaBEUrat Relatif – Institut Teknologi Bandung) is a free and interactive software for adjustment of relative gravimeter data, developed based on Python programming language. pyGABEUR-ITB can adjust relative gravity measurements and provide reliable estimates for correcting instrument’s systematic errors, such as gravimeter drift. Furthermore, pyGABEUR-ITB can also detect possible outliers in the observations using the t-criterion method. Since pyGABEUR-ITB is using the weighted constraint adjustment, at least one fixed station is required accordingly. Relative gravimeter data around Palu-Donggala area (Central Sulawesi) observed by Center for Geodesy Control Networks and Geodynamics, Geospatial Information Agency, were used to test the performance of pyGABEUR-ITB. The processing results were then compared against those calculated using GRAVNET software. The comparisons show that both pyGABEUR-ITB and GRAVNET softwares statistically provide simillar results, with the total RMS value of about 5 mGal. In term of computer’s requirement, pyGABEUR-ITB can be excecuted under a computer with the following minimal requirements: x64 CPU, 1 GB memory and WINDOWS 7 OS. Finally, it is important to mention that pyGABEUR-ITB is recently suited to process the data from the gravimeter that adopts the principle of vertical spring balance. In the near future, pyGABEUR-ITB will be extended to be able to automatically adapt to various observation principles.
Analisis Pergeseran Koseismik Gempa Sianok Tahun 2007 Berdasarkan Data Pengamatan GPS Tahun 1993-2007 dan Efek terhadap SRGI 2013 Efendi, Joni; Prijatna, Kosasih; Meilano, Irwan
REKA GEOMATIKA Vol 2018, No 1
Publisher : Institut Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1455.25 KB) | DOI: 10.26760/jrg.v2018i1.2662

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ABSTRAKTumbukan miring Lempeng Eurasia dengan Lempeng Indo-Australia membentuk zona subduksi di bagian barat Pulau Sumatra dan sejumlah segmen sesar di darat Pulau Sumatra. Zona subduksi dan segmen sesar yang terbentuk aktif bergerak sehingga sering menimbulkan gempa bumi di wilayah tersebut. Semenjak diberlakukannya Sistem Referensi Geospasial Indonesia 2013 (SRGI 2013) sebagai referensi tunggal dalam aktivitas pemetaan di Indonesia, maka perubahan posisi kerangka referensi koordinat sebagai fungsi waktu akibat dinamika bumi perlu diperhitungkan. Dengan terjadinya dua gempabumi yang berurutan pada tanggal 6 Maret 2007 di wilayah Danau Singkarak Sumatra Barat, akan menimbulkan deformasi koseismik yang dapat mempengaruhi SRGI2013. Dalam penelitian ini dilakukan analisis untuk menentukan model koseismik gempabumi Sianok yang paling sesuai dan sejauh mana dampaknya pada SRGI 2013. Berdasarkan hasil analisis terhadap nilai residual hasil validasi dengan koseismik pada 11 titik pengamatan GPS dapat disimpulkan bahwa model koseismik dari gempabumi Sianok adalah model koseismik menggunakan data parameter gempa dari Global CMT dengan residual misfit 47.5 mm. Secara umum, pola kosesimik gempabumi Sianok mendeskripsikan mekanisme gempabumi sesar geser. Nilai kosesimik terbesar terjadi pada titik KACA dan K108, yaitu 135,43 mm dan 84,74 mm. Besarnya koseismik gempabumi Sianok tidak berpengaruh terhadap peta dengan skala 1: 1000, akan tetapi akan mempengaruhi nilai koordinat Jaring Kontrol Geodesi (JKG) yang berada di sekitar daerah gempa, sehingga perlu adanya pemutakhiran koordinat dari JKG.Kata kunci: Gempabumi Sianok, GPS, Deformasi Koseismik, SRGI2013. ABSTRACTThe oblique movement of Eurasian Plate towards Indo-Australian Plate create subduction zone in the western part of Sumatra Island and some faults on the mainland of Sumatra. These subduction zone and faults actively produce some earthquakes. Since we used the Geospatial Reference System of Indonesia 2013 (SRGI 2013) as one reference on mapping activities in Indonesia, coordinate changes as a function of time caused by earthquake cycle need to be calculated. There are two earthquakes that had been occurred on March 6, 2007 in Singkarak Lake area which affected the SRGI 2013. We analyzed the data to estimate the coseismic model of Sianok earthquake and the impact to the SRGI 2013. The residual from the coseismic model by including 11 GPS displacements shows that the coseismic model of Sianok earthquake is a model that used earthquake parameters from Global CMT with the misfit of 47.5 mm. Overall, this coseismic pattern shows the shear mechanism. The largest displacements are on KACA and K108 sites, that are 135.43 mm and 84.74 mm respectively. The coseimic of Sianok earthquake does not affect a map with scale of 1:1000, but affect the Geodetic Control Network in this area. From this analysis, we conclude that we need to update our Geodetic Control Network.Keywords: Sianok Earthquake, GPS, Coseismic Deformation, SRGI2013.
Co-Authors Dhota Pradipta, Dhota irwan meilano Joni Efendi, Joni Muhamad, Norman Arif Nurmaulita, Sella Lestari Pahlevi, Arisauna Prayudha Hartanto, Prayudha Sadarviana, Vera Sarsito, Dina A. Sella Lestari Nurmaulia, Sella Variandy, Erfan D. Wedyanto Kuntjoro Widy Putra, Widy Wijaya, Dudy Darmawan