Geoid determination with Hotine’s integral based on terrestrial gravity data in Semarang city

Sabri, LM; Heliani, Leni Sophia; Sunantyo, Tarsisius Aris; Widjajanti, Nurrohmat

doi:10.1088/1742-6596/1127/1/012047

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…In practice, the orthometric height is derived from the geodetic height reduced by the geoid undulation value at the measurement point. This weakness can be overcome by the Hotine approach which only relies on geodetic heights from GNSS measurements without requiring reduction to orthometric heights [8] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Adding Global Geopotential Model Generated Data to Terrestrial Data on Geoid Model (case study at Bekasi, Indonesia)

Sabri,

Susilo,

Ramdani

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Geoid modeling requires accurate and evenly distributed gravity data throughout the study area. Although airborne gravity measurements are getting more massive, some areas are politically restricted areas. Therefore, terrestrial measurements are still needed, such as in Bekasi City and its surroundings. In terrestrial geoid modeling, ideal conditions are often difficult to achieve, because terrestrial measurements can only be made in accessible, safe, and permitted places. These non-ideal conditions result in an uneven distribution of data which can decrease in the accuracy of the resulting geoid. One way to overcome this data acquisition problem is to fill in the data using synthetic data calculated from the global geopotential model data. This study aimed to analyze the effect of using EGM data on geoid accuracy. The data needed for this research were terrestrial gravity data, EGM2008, and SRTM30 Plus, and GEBCO. The geoid was calculated using several calculation modules from Gravsoft. Specific modifications were made using Simply Fortran to facilitate geoid modelling with integral of Hotine. This research was conducted with two scenarios, namely geoid calculations using only terrestrial gravity data and geoid calculations using a combination of terrestrial data and EGM2008. The accuracy of the geoid was analyzed based on the magnitude of the deviation between the local Bekasi geoid and the national geoid represented by INAGEOID2020 2020 version 2. Free Air gravity anomaly provide by Badan Informasi Geospasial were converted to be gravity disturbance data on the earth’s surface. The secondary data gravity disturbance was calculated from EGM2008 with n=360 and n=2190. The geoid calculated from terrestrial geoid data alone produced the largest offset to the national geoid. Combination of terrestrial gravity data and generated data from EGM2008 n=360 performed higher precision geoid.

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Section: Introductionmentioning

confidence: 99%

Effect of Adding Global Geopotential Model Generated Data to Terrestrial Data on Geoid Model (case study at Bekasi, Indonesia)

Sabri,

Susilo,

Ramdani

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Gravity anomaly data is used to calculate geoids with the Stokes and Molodensky approach. Gravity disturbance data is used to calculate geoid by Hotine approach [7]. Outside of Indonesia, gravity disturbance data is not only used for geoid calculations but also for vertical deflection calculations.…”

Section: Introductionmentioning

confidence: 99%

Determination of Vertical Deflection Based on Terestrial Gravity Disturbance Data (A Case Study in Semarang City)

Sabri

Sudarsono

Indriana

2019

KEG

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Vertical deflection can be determined by geometrical and physical measurement. In geometrical way, vertical deflection is obtained by comparing astronomical coordinate and geodetical coordinate. In physical way, vertical deflection can be computed from gravity measurement. In the past, vertical deflection was computed from gravity anomaly data. Gravity anomaly data measurement is difficult because it need reduction of gravity from surface of the earth to the geoid using orthometric height from spirit level measurement. In modern era, gravity anomaly data may be replaced by gravity disturbance data whose only required gravity and GNSS (Global Navigation Satellite System) measurement. This research aims to determine vertical deflection in Semarang City from terrestrial gravity disturbance data. The gravity data were measured in March of 2016. Formula of Vening Meinesz that usually used for vertical deflection was replaced by new formula that generated from derivation of function of Hotine. Applying gravity disturbance gave vertical deflection of east-west component that were vary from -1.2” to 12.2” while north-south component were vary from -4.2” to 4.2”. Comparing vertical deflection as computed from terrestrial data to as computed from EGM2008 coefficients showed conformity in shape and values. It was concluded that derivation of function of Hotine could be applied for vertical deflection determination from gravity disturbance.

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Data requirements for the determination of a sub-centimetre geoid

Foroughi

Goli

Pagiatakis

et al. 2023

Earth-Science Reviews

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Geoid determination with Hotine’s integral based on terrestrial gravity data in Semarang city

Cited by 4 publications

References 2 publications

Effect of Adding Global Geopotential Model Generated Data to Terrestrial Data on Geoid Model (case study at Bekasi, Indonesia)

Effect of Adding Global Geopotential Model Generated Data to Terrestrial Data on Geoid Model (case study at Bekasi, Indonesia)

Determination of Vertical Deflection Based on Terestrial Gravity Disturbance Data (A Case Study in Semarang City)

Data requirements for the determination of a sub-centimetre geoid

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