Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Indonesian Journal of Geospatial Bulletin of Geology
Dhota Pradipta, Dhota
Geodesy Research Division, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, West Java, INDONESIA
Earth & Planetary Sciences Energy Engineering

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (973.783 KB)

Abstract

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. 
EFEK AKURASI DAN GEOMETRIK SISTEM TINGGI DIGITAL ELEVATION MODEL (DEM) TERHADAP PEMODELAN BAHAYA BANJIR ROB DI JAKARTA Juliandri, Firman; Andreas, Heri; Pradipta, Dhota
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2022.6.2.2

Abstract

Penelitian ini bertujuan untuk mengetahui efek akurasi DEM terhadap hasil pemodelan bahaya banjir rob di Jakarta dengan membandingkan hasil pemodelan menggunakan beberapa data DEM yang memiliki variasi akurasi. Model berbasis DEM LiDAR yang memiliki akurasi tinggi dijadikan baseline untuk pengukuran akurasi model lainnya. Pemodelan dengan DEMNAS menghasilkan luas area tergenang yang mendekati model DEM LiDAR dengan rasio perbandingan sebesar 97%. Pemodelan DEM global (open access), terdiri dari DEM SRTM (30 m), DEM TanDEM-X (60 m), dan DEM AW3D (30 m), menghasilkan luas area tergenang yang memiliki variasi antara 5% - 48% dari model DEM LiDAR. Pemodelan menunjukkan korelasi positif antara akurasi vertikal dan resolusi spasial DEM dengan akurasi produk model bahaya banjir rob di Jakarta. Perbandingan antar model secara lebih lanjut dilakukan untuk mendapatkan efek akurasi model terhadap hasil penilaian risiko bencana banjir rob. Penggunaan model DEM global yang berakurasi rendah menghasilkan nilai risiko jumlah penduduk terpapar sebesar 2,2 - 54,0 kali lebih rendah, serta nilai risiko kerugian ekonomi sebesar 1,9 - 37,6 lebih rendah dibandingkan penilaian risiko menggunakan model berbasis DEM LiDAR. Kata kunci: DEM, Jakarta, pemodelan banjir rob, penilaian risiko
ORTHOMETRIC HEIGHT DETERMINATION IN JAKARTA AND SUNDA STRAIT AREA USING THE GEOPOTENTIAL NUMBER APPROACH Sarsito, Dina Anggreni; Bramanto, Brian; Andreas, Heri; Pradipta, Dhota; Triwibowo, Sidiq
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2024.8.1.2

Abstract

Orthometric height is a physical height type used by Indonesia in local/national reference systems for determining positions used in various scientific and engineering activities. The main constraint in determining orthometric height is that it is theoretically difficult to realize that gravity measurements must be carried out along the plumb lines that connect the topographic equipotential surface with the geoid surface. Another constraint is that it requires precise physical height difference measurementsfrom tie points, which are usually located in coastal areas, to locations on land that are far from the coast. This research examines the possibility of determining orthometric physical height at several GNSS stations in the Jakarta and Sunda Strait areasusing the geopotential number approach as an alternative solution to the difficulties caused by the aforementioned constraints. The first type of orthometric height obtained from GNSS geodetic height observations with geoid undulation obtained from the EGM2008 global gravity model is then used as a comparison for the second type of orthometric height obtained from the geopotential number approach. The pattern of geopotential numbers on the islands of Java and Sumatra has the same pattern, namely that the value increases as the topographic elevation increases. This phenomenon is in line with the terrestrial survey approach carried outso far, that the meansea level can be assumed to be an estimate of the geoid surface, which is used as a reference for the gravity potential surface. The average difference in height between the two types of orthometric height is 0.39 meters, with a difference interval between -1.80 meters and 2.73 meters. The results obtained show that the geopotential number approach can be used as an alternative for determining orthometric height if direct gravity measurements and/or precise physical height difference measurements cannot be carried out in the monitoring area. Key words: Orthometric, Geopotential Number, Geoid, Jakarta, Sunda Strait.
Co-Authors Bramanto, Brian Dina Anggreni Sarsito Heri Andreas Juliandri, Firman Kosasih Prijatna, Kosasih Triwibowo, Sidiq Wedyanto Kuntjoro