A new geoid for Brunei Darussalam by the collocation method

Łyszkowicz, Adam; Biryło, Monika; Bęcek, Kazimierz

doi:10.2478/geocart-2014-0013

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…To improve its accuracy parametric models (or a corrective surface) introduced when refining heights (Fotopoulos et al, 2003). Such models include high-order polynomials with interpolation with different basis functions (Zhao et al, 2022), least squares collocation (Lyszkowicz et al, 2014), finite element method (Zaletnyik et al, 2007), Fourier series (Grigoriadis et.al., 2021), and artificial neural networks (Konakoglu & Akar, 2021). Interpolation methods (such as inverse distance weighting, bilinear interpolation, polynomial regression, triangulation, radial basis functions and nearest-neighbor interpolation) were considering according the application area, surface features, distribution of data and their accuracy.…”

Section: Methodsmentioning

confidence: 99%

Vertical accuracy evaluation free access digital elevation models (DEMs): case Fergana Valley in Uzbekistan

Fazilova,

Arabov

2023

Earth sci. res. j.

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In this study, the vertical accuracy of the Shuttle Radar Topography Mission Digital Elevation Model Version 2.0 (SRTM30), the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global DEM Version 2.0 (ASTER GDEM2), and Advanced Land Observing Satellite World 3D Digital Surface Model Version 2.1 (ALOS AW3D30) was statistically assessed using GPS data. The Fergana Valley area was chosen as a study region, where the land surface can reflect tectonic processes. The values of ellipsoidal heights of 27 points of the regional GPS network were chosen as reference data. The geometric approach using GPS/leveling data and EGM96 global geopotential model-based geoid undulations was applied for geoid surface fitting. The geoid height corrections range ranged from –0.66 m to 0.87 m. Root-Mean-Square errors of ~10.0 m, ~16.4 m, and ~6.6 m was obtained for SRTM30, ASTER GDEM2, and ALOS AW3D30, respectively. It was found that compared with the reference model, all the global DEMs in mountainous areas generally overestimated elevation and the value of vertical accuracy at a 90% confidence level by 3-6 meters exceeded the declared by distributors. But ALOS AW3D30 proved to be the most accurate DEM that best represents the topography of the earth’s surface and could be used for some engineering applications in Fergana Valley.

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Section: Methodsmentioning

confidence: 99%

Vertical accuracy evaluation free access digital elevation models (DEMs): case Fergana Valley in Uzbekistan

Fazilova,

Arabov

2023

Earth sci. res. j.

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“…The computation of the model was performed using the least squares collocation method and remove-computerestore procedure with the EGM08 global geopotential model. The estimated accuracy of the gravimetric geoid for the territory of Brunei is at the level of 0.3 m. The geoid model developed shows poor quality of the existing GPS/levelling data in Brunei (Table 6) that indicates poor quality of local vertical datum (Lyszkowicz et al, 2014). The GGI method relies on developing a local model of disturbing potential (anomalous potential) T in the outer space.…”

Section: Geoid Modellingmentioning

confidence: 99%

Gravity field modelling and gravimetry

Krynski

2015

Geodesy and Cartography

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The summary of research activities concerning gravity field modelling and gravimetric works performed in Poland in the period of 2011-2014 is presented. It contains the results of research on geoid modelling in Poland and other countries, evaluation of global geopotential models, determination of temporal variations of the gravity field with the use of data from satellite gravity space missions, absolute gravity surveys for the maintenance and modernization of the gravity control in Poland and overseas, metrological aspects in gravimetry, maintenance of gravimetric calibration baselines, and investigations of the nontidal gravity changes. The bibliography of the related works is given in references.

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Comparative analysis among Asia–Pacific geoid models stored at the ISG repository

Gaetani

Batsukh

Rossi

et al. 2022

TAO

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Geoid models have important applications in geosciences as well as engineering, for example, for the conversion from ellipsoidal heights observed by GNSS techniques to orthometric heights. To meet the user’s demands, the International Service for the Geoid (ISG, https://www.isgeoid.polimi.it/) provides access to a repository of local, regional, and continental geoid models through its website. Among hundreds of worldwide models, there are many covering countries in the Asia–Pacific area. The focus of this study is about this region, performing a series of analyses to assess the geoid models stored in the ISG repository through some relative comparisons. In particular, three kinds of analyses are performed with the purpose of: (a) investigating the evolution in time of a geoid series referring to the same country, (b) comparing the information provided by local and regional geoid models on overlapped areas, and (c) assessing the agreement between local and global models. These analyses are firstly performed on sample models, providing a detailed description, and then applied to all Asia–Pacific geoid models currently stored in the ISG repository, providing summary statistics.

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A new geoid for Brunei Darussalam by the collocation method

Cited by 3 publications

References 17 publications

Vertical accuracy evaluation free access digital elevation models (DEMs): case Fergana Valley in Uzbekistan

Vertical accuracy evaluation free access digital elevation models (DEMs): case Fergana Valley in Uzbekistan

Gravity field modelling and gravimetry

Comparative analysis among Asia–Pacific geoid models stored at the ISG repository

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