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Journal articles on the topic 'Hybrid geoid'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Borghi, Alessandra, Riccardo Barzaghi, Omar Al-Bayari, and Suhail Al Madani. "Centimeter Precision Geoid Model for Jeddah Region (Saudi Arabia)." Remote Sensing 12, no. 12 (June 26, 2020): 2066. http://dx.doi.org/10.3390/rs12122066.

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In 2014, the Jeddah Municipality made a call for an estimate of a centimetric precision geoid model to be used for engineering and surveying applications, because the regional geoid model available at that time did not reach a sufficient precision. A project was set up to this end and dedicated sets of gravity and Global Positioning System (GPS)/levelling data were acquired in the framework of this project. In this paper, a thorough analysis of these newly acquired data and of the last available Global Gravity Field Models (GGMs) has been done in order to obtain a geoid undulation estimate with the prescribed precision. In the framework of the Remove–Compute–Restore (RCR) approach, the collocation method was used to obtain the height anomaly estimation that was then converted to geoid undulation. The remove and restore steps of the RCR approach were based on GGMs, derived from the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) and Gravity Recovery and Climate Experiment (GRACE) dedicated gravity satellite missions, which were used to improve the long wavelength components of the Earth’s gravity field. Furthermore, two different quasi-geoid collocation estimates were computed, based on gravity data only and on gravity plus GPS/levelling data (the so-called hybrid estimate). The best solutions were obtained with the hybrid geoid estimate. This was tested by comparison with an independent set of GPS/levelling geoid undulations that were not included in the computed solutions. By these tests, the precision of the hybrid geoid is estimated to be 3.7 cm. This precision proved to be better, by a factor of two, than the corresponding one estimated from the pure gravimetric geoid. This project has been also useful to verify the importance and reliability of GGMs developed from the last satellite gravity missions (GOCE and GRACE) that have significantly improved our knowledge of the long wavelength components of the Earth’s gravity field, especially in areas with poor coverage of terrestrial gravity data. In fact, the geoid models based on satellite-only GGMs proved to have a better performance, despite the lower spatial resolution with respect to high-resolution models (i.e., Earth Gravitational Model 2008 (EGM2008)).
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2

ARANA, DANIEL, PAULO O. CAMARGO, and GABRIEL N. GUIMARÃES. "Hybrid Geoid Model: Theory and Application in Brazil." Anais da Academia Brasileira de Ciências 89, no. 3 (September 2017): 1943–59. http://dx.doi.org/10.1590/0001-3765201720160802.

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3

Kuroishi, Y., H. Ando, and Y. Fukuda. "A new hybrid geoid model for Japan, GSIGEO2000." Journal of Geodesy 76, no. 8 (November 1, 2002): 428–36. http://dx.doi.org/10.1007/s00190-002-0266-5.

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4

Kim, Su-Kyung, Jihye Park, Daniel Gillins, and Michael Dennis. "On determining orthometric heights from a corrector surface model based on leveling observations, GNSS, and a geoid model." Journal of Applied Geodesy 12, no. 4 (October 25, 2018): 323–33. http://dx.doi.org/10.1515/jag-2018-0014.

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Abstract Leveling is a traditional geodetic surveying technique that has been used to realize a vertical datum. However, this technique is time consuming and prone to accumulate errors, where it relies on starting from one station with a known orthometric height. Establishing orthometric heights using Global Navigation Satellite Systems (GNSS) and a geoid model has been suggested [14], but this approach may involve less precisions than the direct measurements from leveling. In this study, an experimental study is presented to adjust the highly accurate leveling observations along with orthometric heights derived from GNSS observations and a geoid model. For the geoid model, the National Geodetic Survey’s gravimetric geoid model (TxGEOID16B) and hybrid geoid model (GEOID12B) were applied. Uncertainties in the leveled height differences, GNSS derived heights, and the geoid models were modeled, and a combined adjustment was implemented to construct the optimal combination of orthometric, ellipsoidal, and geoid height at each mark. As a result, the discrepancy from the published orthometric heights and the CSM (Corrector Surface Model) based adjusted orthometric heights with GEOID12B showed a mean and RMS of -8.5 mm and 16.6 mm, respectively, while TxGEOID16B had a mean and RMS of 28.9 mm and 34.6 mm, respectively. It should be emphasized that this approach was not influenced by the geodetic distribution of the stations where the correlation coefficients between the distance from the center of the surveying network and the discrepancy from the published heights using TxGEOID16B and GEOID12B are 0.03 and 0.36, respectively.
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5

Del Rio, Eduardo. "On accurate geoid modeling: derivation of dirichlet problems that govern geoidal undulations and geoid modeling by means of the finite difference method and a hybrid method." Boletim de Ciências Geodésicas 20, no. 2 (June 2014): 334–53. http://dx.doi.org/10.1590/s1982-21702014000200020.

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The geoid is the reference surface used to measure heights (orthometric). These are used to study any mass variability in the Earth system. As the Earth is represented by an oblate spheroid (Ellipsoid), the geoid is determined by geoidal undulations (N) which are the separation between these surfaces. N is determined from gravity data by Stokes's Integral. However, this approach takes a Spherical rather than an Ellipsoidal Earth. Here it is derived a Partial Differential Equation (PDE) that governs N over the Earth by means of a Dirichlet problem and show a method to solve it which precludes the need for a Spherical Earth. Moreover, Stokes's Integral solves a boundary value problem defined over the whole Earth. It was found that the Dirichlet problem derived here is defined only over the region where a geoid model is to be computed, which is advantageous for local geoid modeling. Moreover, the method eliminates several of the sources of uncertainty in Stokes's Integral. However, estimates indicate that the errors due to discretization are very large in this new method which calls for its modification. So, here it is also proposed an optimal combination of techniques by means of a Hybrid method and shown that it alleviates the uncertainty in Finite Difference Method. Moreover, a rigorous error analysis indicates that the Hybrid method proposed here may well outperform Stokes's Integral.
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6

Chen, Yong-Qi, and Zhicai Luo. "A hybrid method to determine a local geoid model—Case study." Earth, Planets and Space 56, no. 4 (April 2004): 419–27. http://dx.doi.org/10.1186/bf03352495.

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7

Kadaj, Roman, and Tomasz Świętoń. "Theoretical and Applied Research in the Field of Higher Geodesy Conducted in Rzeszow." Reports on Geodesy and Geoinformatics 100, no. 1 (June 1, 2016): 79–100. http://dx.doi.org/10.1515/rgg-2016-0008.

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Abstract Important qualitative changes were taking place in polish geodesy in last few years. It was related to application of new techniques and technologies and to introduction of European reference frames in Poland. New reference stations network ASG-EUPOS, together with Internet services which helps in precise positioning was created. It allows to fast setting up precise hybrid networks. New, accurate satellite networks became the basis of new definitions in the field of reference systems. Simultaneously arise the need of new software, which enables to execute the geodetic works in new technical conditions. Authors had an opportunity to participate in mentioned undertakings, also under the aegis of GUGiK, by creation of methods, algorithms and necessary software tools. In this way the automatic postprocessing module (APPS) in POZGEO service, a part of ASG-EUPOS system came into being. It is an entirely polish product which works in Trimble environment. Universal software for transformation between PLETRF89, PL-ETRF2000, PULKOWO’42 reference systems as well as defined coordinate systems was created (TRANSPOL v. 2.06) and published as open product. An essential functional element of the program is the quasi-geoid model PL-geoid-2011, which has been elaborated by adjustment (calibration) of the global quasi-geoid model EGM2008 to 570 geodetic points (satellite-leveling points). Those and other studies are briefly described in this paper.
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8

Lee, Dong-Ha, Hong-Sik Yun, Hae-Ik Jung, Jae-Myoung Cho, Jung-Ho Cho, Woon-Chul Jung, and Jin-Sang Hwang. "Transformation of Vertical Datum Surface in the Coastal Area using Hybrid Geoid Models." Journal of Coastal Research 165 (January 3, 2013): 1427–32. http://dx.doi.org/10.2112/si65-241.1.

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9

Guo, Dong-Mei, Hou-Ze Xu, and Ming Chen. "Precise Geoid Determination over Hong Kong from Heterogeneous Data Sets using a Hybrid Method." Marine Geodesy 40, no. 2-3 (March 27, 2017): 160–71. http://dx.doi.org/10.1080/01490419.2017.1309330.

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10

Morozova, K., R. Jaeger, J. Balodis, and J. Kaminskis. "Software development and its description for Geoid determination based on Spherical-Cap-Harmonics Modelling using digital-zenith camera and gravimetric measurements hybrid data." IOP Conference Series: Materials Science and Engineering 251 (October 2017): 012065. http://dx.doi.org/10.1088/1757-899x/251/1/012065.

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11

Tütüncü, Kemal, Mehmet Akif Şahman, and Ekrem Tuşat. "A hybrid binary grey wolf optimizer for selection and reduction of reference points with extreme learning machine approach on local GNSS/leveling geoid determination." Applied Soft Computing 108 (September 2021): 107444. http://dx.doi.org/10.1016/j.asoc.2021.107444.

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12

Yan, Yonggan, Jun Huang, Xiaoyong Qiu, Xin Cui, Shulei Xu, Xunwei Wu, Peng Yao, and Chuanzhen Huang. "An ultra-stretchable glycerol-ionic hybrid hydrogel with reversible gelid adhesion." Journal of Colloid and Interface Science 582 (January 2021): 187–200. http://dx.doi.org/10.1016/j.jcis.2020.08.008.

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13

Tarrío Mosquera, José Antonio, Marcelo Caverlotti Silva, Fernando Isla, and Carlos Prado. "Assessment of hybrid geoids in Chile and Spain, combining GGM and GNSS/Leveling observations." Geodesy and Geodynamics 12, no. 2 (March 2021): 65–92. http://dx.doi.org/10.1016/j.geog.2020.12.003.

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14

Sj�berg, L. E., and W. E. Featherstone. "Two-step procedures for hybrid geoid modelling." Journal of Geodesy 78, no. 1-2 (June 21, 2004). http://dx.doi.org/10.1007/s00190-003-0367-9.

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15

Arifuzzaman, Kazi, and Raymond J. Hintz. "A Spatial Analysis of GEOID03 and GEOID09 in Connecticut." Journal of Applied Geodesy 10, no. 2 (January 1, 2016). http://dx.doi.org/10.1515/jag-2015-0013.

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AbstractThe National Geodetic Survey (NGS) recommends using a hybrid geoid model to derive orthometric heights from ellipsoid heights. The accuracy of GEOID03 and GEOID09 were assessed independently in Connecticut. The present research analyses the spatial behavior of residuals derived from the comparison of differential levelled NAVD 88 orthometric heights and GPS-derived orthometric heights (using GEOID03 & GEOID09) at 72 benchmarks in Connecticut. Both geometrical and geostatistical analyses were performed on the residuals. A planar regression model indicates a weak spatial relation for residuals derived from GEOID03. This weakness was not noted in the analysis of residuals derived from GEOID09. Results of a four-parameter regression model does not indicate any need for a correction surface. A kriging surface was created with a fitted spherical semivariogram model and suggests GEOID09 captures more spatial variability of geoid undulation than GEOID03 in Connecticut.
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16

Hwang, Cheinway, Hung-Jui Hsu, W. E. Featherstone, Ching-Chung Cheng, Ming Yang, Wenhsuan Huang, Chong-You Wang, et al. "New gravimetric-only and hybrid geoid models of Taiwan for height modernisation, cross-island datum connection and airborne LiDAR mapping." Journal of Geodesy 94, no. 9 (August 12, 2020). http://dx.doi.org/10.1007/s00190-020-01412-5.

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17

El-Ashquer, Mohamed, Basem Elsaka, and Gamal El-Fiky. "EGY-HGM2016: an improved hybrid local geoid model for Egypt based on the combination of GOCE-based geopotential model with gravimetric and GNSS/levelling measurements." Arabian Journal of Geosciences 10, no. 11 (June 2017). http://dx.doi.org/10.1007/s12517-017-3042-9.

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