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Journal articles on the topic 'Geoidal maps'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Tukka, A. A., H. Tata, and O. T. Idowu. "A Computational Tool for Local Gravimetric Geoid Determination Using Least Squares Collocation." Journal of Spatial Information Sciences 2, no. 1 (2025): 251–74. https://doi.org/10.5281/zenodo.14961951.

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<em>This study presents a computational tool (TUIDOTA), for determining local gravimetric geoids using Least Squares Collocation (LSC) techniques, essential for geodetic applications. The geoid provides a reference surface for determining the height of the earth's surface. The study focuses on evaluating the potential of the tool within Akure South Local Government Area in Ondo State of Nigeria, representing mountainous terrains. High-quality terrestrial gravity data, geopotential, and digital elevation models were used. The developed tool facilitates the selection between SLSC and NSLSC, maki

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Tenzer, Robert, and Peter Vajda. "Global maps of the step-wise topography corrected and crustal components stripped geoids using the CRUST 2.0 model." Contributions to Geophysics and Geodesy 39, no. 1 (2009): 1–17. http://dx.doi.org/10.2478/v10126-009-0001-9.

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Global maps of the step-wise topography corrected and crustal components stripped geoids using the CRUST 2.0 modelWe compile global maps of the step-wise topography corrected and crustal components stripped geoids based on the geopotential model EGM'08 complete to spherical harmonic degree 180 and the CRUST 2.0 global crustal model. The spectral resolution complete to degree 180 is used to compute the primary indirect bathymetric stripping and topographic effects on the geoid, while degree 90 for the primary indirect ice stripping effect. The primary indirect stripping effects of the soft and

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Madufor, M.O., M.N. Ono, A.O. Oliya, and W. A. Ojanikele. "Modeling of Orthometric Heights from Multi-Networks of GNSS/Precise Levelling in Owerri and Environs, Imo State, Nigeria." Journal of Scientific and Engineering Research 10, no. 11 (2023): 35–40. https://doi.org/10.5281/zenodo.10465693.

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<strong>Abstract </strong>Orthometric heights based on GNSS require a geoid model to convert highly accurate ellipsoidal height (h) to the much-desired orthometric height (H) critical to many cadastral, surveying, mapping, engineering and environmental applications. The GNSS uses the default integrated global geoid models (EGM96/EGM2008) for ellipsoidal height conversion to orthometric but for local applications, global model is inadequate and hence development of local geoid models in the absence of a national geoid becomes very critical. The aim of this research is to model orthometric heigh

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Guimarães, Gabriel Do Nascimento, Ana Cristina Oliveira Cancoro De Matos, and Denizar Blitzkow. "GRAVIMETRIC DENSIFICATION IN THE STATE OF SÃO PAULO AIMING A GEOID MODEL." Revista Brasileira de Geofísica 31, no. 4 (2013): 631. http://dx.doi.org/10.22564/rbgf.v31i4.343.

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ABSTRACT. Gravitydata coverage is quite complete in São Paulo state for a 5’ resolution. In addition, field works have been conducted to fill in gaps around the state. These efforts are the results of the Fundac¸˜ao de Amparo `a Pesquisa do Estado de S˜ao Paulo (FAPESP) Thematic Project that seeks to achieve the establishment of a geoid model, a height system, and the study of mean sea level. This paper presents a comparison between two geoidal height models; the first with information available up to 2008 (beginning of the project) and the second including all data collected. Both models have

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Sievers, J., C. S. M. Doake, J. Ihde, et al. "Validating and improving elevation data of a satellite-image map of Filchner,Ronne Ice Shelf, Antarctica, with Results from ERS-1." Annals of Glaciology 20 (1994): 347–52. http://dx.doi.org/10.3189/1994aog20-1-347-352.

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A satellite-image map with surface-elevation contours of Filchner Ronne Ice Shelf has been published previously as a topographic map. The image map was constructed from a mosaic of 69 Landsat Multispectral Scanner (MSS) images and NOAA AVHRR data. The standard deviation in position in the central part of the mosaic is ±125m. Topographic-glaciologic features were taken from Landsat scenes and represent the best coastline of this region. Surface elevations have been calculated from airborne and ground measurements of either ice thickness (by assuming hydrostatic equilibrium) or barometric pressu

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Sievers, J., C. S. M. Doake, J. Ihde, et al. "Validating and improving elevation data of a satellite-image map of Filchner,Ronne Ice Shelf, Antarctica, with Results from ERS-1." Annals of Glaciology 20 (1994): 347–52. http://dx.doi.org/10.1017/s0260305500016670.

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A satellite-image map with surface-elevation contours of Filchner Ronne Ice Shelf has been published previously as a topographic map. The image map was constructed from a mosaic of 69 Landsat Multispectral Scanner (MSS) images and NOAA AVHRR data. The standard deviation in position in the central part of the mosaic is ±125m. Topographic-glaciologic features were taken from Landsat scenes and represent the best coastline of this region. Surface elevations have been calculated from airborne and ground measurements of either ice thickness (by assuming hydrostatic equilibrium) or barometric pressu

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Marotta, Giuliano, Yellinson Almeida, and Maria Lígia Chuerubim. "Análise da Influência do Valor de Densidade na Estimativa do Modelo Geoidal Local para o Distrito Federal, Brasil." Revista Brasileira de Cartografia 71, no. 4 (2019): 1089–113. http://dx.doi.org/10.14393/rbcv71n4-49274.

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O modelo geoidal é parte fundamental na transformação entre as altitudes geométricas e ortométricas, e ganhou mais importância com a popularização de técnicas de posicionamento por GNSS. No entanto, para simplificar, verifica-se que um valor de densidade médio da crosta ainda vem sendo aplicado nos procedimentos de cálculo. Por este motivo, este trabalho buscou analisar a influência do valor de densidade adotado na estimativa de um modelo geoidal. Para isto foram estimados valores fixo e variáveis de densidade para a área de estudos, por meio de dados gravimétricos e de litologia. Estes valore

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Marques, Éder Teixeira, William Rodrigo Dal Poz, and Gabriel Do Nascimento Guimarães. "GEOID MODELLING USING INTEGRATION AND FFT ASSOCIATED WITH DIFFERENT GRAVIMETRIC REDUCTION METHODS." Revista Brasileira de Geofísica 36, no. 1 (2018): 81. http://dx.doi.org/10.22564/rbgf.v36i1.909.

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ABSTRACT. A vertical reference system is characterized by a vertical datum and a set of scientific altitudes. In the case of orthometric altitudes, the geoid is used as a reference surface, equipotential surface of the gravity field of the Earth that better fits, in the sense of the Least Square Method, to the mean sea level. This study aimed to determine the geoid by applying two processes for calculation of residual ondulation, the integration and the Fast Fourier Transform. These techniques were applied to the values of the residual anomalies obtained from different methods of gravimetric r

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Matos, Ana Cristina Oliveira Cancoro de, Denizar Blitzkow, Gabriel do Nascimento Guimarães, Maria Cristina Barbosa Lobianco, and Sônia Maria Alves Costa. "Validação do MAPGEO2010 e comparação com modelos do geopotencial recentes." Boletim de Ciências Geodésicas 18, no. 1 (2012): 101–22. http://dx.doi.org/10.1590/s1982-21702012000100006.

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Este trabalho visa apresentar a metodologia de cálculo e analisar o resultado do modelo de alturas geoidais para o Brasil. O mesmo abrange a área compreendida pelas latitudes de 6ºN e 35ºS e pelas longitudes de 75ºW e 30ºW. Os dados gravimétricos terrestres foram atualizados com as mais recentes medições no Brasil e seus países vizinhos. As anomalias completas de Bouguer e de Helmert sobre a superfície terrestre foram calculadas através do pacote canadense SHGEO. A componente de curto comprimento de onda foi estimada através da integral modificada de Stokes utilizando a técnica FFT. O modelo d

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Ashkenazi, V. "Coordinate Systems: How to Get Your Position Very Precise and Completely Wrong." Journal of Navigation 39, no. 2 (1986): 269–78. http://dx.doi.org/10.1017/s0373463300000126.

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Positioning by navigation satellites is carried out in three-dimensional geocentric cartesian coordinates, X, Y, Z. This applies to both the Transit System, which has now been in operation for over 20 years, and the Global Positioning System which is being tested and is due to become operational in 1988. Traditionally, the cartographer, the seafaring navigator and the geodetic surveyor have always expressed their coordinates in geographical terms, i.e. latitude and longtitude, whereas the land-based civil engineer, surveyor and the foot (or mechanized) soldier preferred theirs in terms of proj

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Chuerubim, Maria Lígia. "UTILIZAÇÃO DO SOFTWARE MAPGEO 2010 COMO RECURSO DIDÁTICO NO ESTUDO DAS SUPERFÍCIES E REFERENCIAIS GEODÉSICOS ADOTADOS EM GEODÉSIA." REVISTA GEOGRÁFICA ACADÊMICA 7, no. 2 (2013): 31. http://dx.doi.org/10.18227/1678-7226rga.v7i2.2990.

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<p>Este artigo visa realizar uma breve abordagem dos principais conceitos, aplicações e técnicas de <br />posicionamento espacial GNSS (Global Navigation Satellite System) como, por exemplo, o GPS (Global <br />Positioning System), envolvidas na obtenção da ondulação geoidal e na conversão entre as altitudes <br />geométricas (elipsoidais) e científicas (ortométricas). A utilização de modelos matemáticos que relacionam as <br />altitudes ortométricas e geométrica ao geóide possibilitam a obtenção da ondulação geoidal, que reflete a <br />distribuição de mass

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12

Siqueira, Loram, and Alessandra Svonka Palmeiro. "Avaliação da expansão da rede de dados gravimétricos e influência do relevo na solução dos curtos e curtíssimos comprimentos de onda do sinal de N no modelo geoidal brasileiro 2015 para a o sul de Minas Gerais." Revista Brasileira de Geomática 6, no. 4 (2018): 294. http://dx.doi.org/10.3895/rbgeo.v6n4.7480.

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A comunidade geodésica tem desenvolvido pesquisas e buscado uma metodologia adequada, com uma quantidade restrita de dados gravimétricos, visando à obtenção de um sistema de altitudes consistente e único. Neste contexto a utilização de Modelos Geoidais (MGs) para a determinação de altitudes com significado físico obteve grande avanço junto a era espacial. O MAPGEO2015 é o mais recente Modelo Geoidal (MG) brasileiro, produzido e fornecido pela Fundação Instituto Brasileiro de Geografia e Estatística (IBGE) e pela Escola Politécnica da Universidade de São Paulo (EP/USP). Este trabalho, a partir

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Olliver, J. G. "SPACE-DERIVED GEOID MAPS OF GREAT BRITAIN." Survey Review 31, no. 244 (1992): 310–20. http://dx.doi.org/10.1179/sre.1992.31.244.310.

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Akinola, A. P., T. B. Afeni, and R. A. Osemenam. "Surface modelling by geoid determination for flood control of Ewekoro limestone deposit (Nigeria)." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 5 (2020): 22–29. http://dx.doi.org/10.33271/nvngu/2021-5/022.

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Purpose. To determine the geoid heights from various control points of the quarry located in the northern and southern zones of the limestone deposit of the Lafarge WAPCO Cement Ewekoro in Ogun State, Nigeria. Methodology. The GPS and levelling data were used to determine the geoid heights from various control points of the quarry located in the northern and southern zones of the limestone deposit. The geoid heights obtained from GPS-Levelling data were used for three surface models which are polynomial regression model, inverse distance model and nearest neighbour model. These models were use

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Raufu, Ibrahim Olatunji, Herbert Tata, and Solihu Olaosegba. "GEODESY, CARTOGRAPHY, AND AERIAL PHOTOGRAPHY." GEODESY, CARTOGRAPHY, AND AERIAL PHOTOGRAPHY 98,2023, no. 98 (2023): 63–75. http://dx.doi.org/10.23939/istcgcap2023.98.063.

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The study was aimed at developing a geoid model using Unmanned Aerial Vehicle (UAV) technology. To accomplish this, a UAV was deployed to capture imagery of the study area from a height of 150m, with a ground resolution of 4.19cm. A total of 3737 images were obtained, covering an area of 725.804 hectares. The existing ellipsoidal and orthometric heights were used to georeferenced the acquired images. For the analysis, 35 points were utilized, with 20 points designated as ground control points (GCPs) and the remaining 15 points as check points (CPs). Using the UAV-derived Digital Terrain Models

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Italo Lins Lemos and Renato Cesar Cani. "O NEGACIONISMO NÃO É UMA FORMA DE CETICISMO." ARARIPE — REVISTA DE FILOSOFIA - 4, no. 1 (2023): 42–60. http://dx.doi.org/10.56837/araripe.2023.v4.n1.1145.

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O nosso objetivo, neste artigo, é argumentar que o negacionismo não é uma forma de ceticismo. Enquanto o cético concede o seu assentimento às proposições que possuem evidências contundentes e suspende o seu juízo a respeito das proposições obscuras, o negacionista, segundo Lawrence Torcello (2016), rejeita um consenso científico por motivos que são independentes da pesquisa e do progresso das ciências. Além disso, o negacionista, mais do que negar uma tese bem estabelecida pela comunidade especializada, e longe de suspender o juízo acerca de proposições obscuras, sustenta categoricamente teses

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Lemenkova, Polina. "Cartographic Scripting for Geophysical Mapping of Malawi Rift Zone." Tehnika 77, no. 2 (2022): 183–91. https://doi.org/10.5281/zenodo.6568558.

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This paper describes a scripting cartographic techniques that automatically generate maps from open source spatial data using syntax of General Mapping Tools (GMT) and R. A case study present mapping East Africa with a focus on Malawi. In this study, two different approaches of scripting cartography using R programming language and GMT were studied for geophysical analysis aimed to visualize a series of eight new maps in Malawi: topography based on the GEBCO data, seismicity, geomo- rphometric modeling based on SRTM-90 m (slope, aspect, hillshade and elevation) and geophysical fields: geoid ba

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Elaksher, Ahmed, Franck Kamtchang, Christian Wegmann, and Adalberto Guerrero. "Assessing the quality of GEOID12B model through field surveys." Journal of Applied Geodesy 12, no. 1 (2018): 1–13. http://dx.doi.org/10.1515/jag-2017-0013.

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AbstractElevation differences have been determined through conventional ground surveying techniques for over a century. Since the mid-80s GPS, GLONASS and other satellite systems have modernized the means by which elevation differences are observed. In this article, we assessed the quality of GEIOD12B through long-occupation GNSS static surveys. A set of NGS benchmarks was occupied for at least one hour using dual-frequency GNSS receivers. Collected measurements were processed using a single CORS station at most 24 kilometers from the benchmarks. Geoid undulation values were driven by subtract

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ETEJE, S. O., P. D. OLUYORI, and M. N. ONO. "Comparison of Two Polynomial Geoid Models of GNSS/Leveling Geoid Development for Orthometric Heights in FCT, Abuja." International Journal of Engineering Research and Advanced Technology (IJERAT) 4, no. 10 (2018): 1–9. https://doi.org/10.5281/zenodo.2525684.

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Ellipsoidal heights from GNSS require geoid model for conversion to orthometric height. The geoid model could be global, regional or local. The lack of national geoid model in Nigeria makes development of local geoid very critical to local applications in place of integrated global geoid models. This study compares two polynomial geoid models for terrain representation in the FCT, Abuja. Nine coefficients were used to model the FCT surface for geoid interpolation and orthometric height modeling. Model A involved the use of the 2-D (x, y) positions while model B used 3-D (x, y, ) where = ( &nda

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Lemenkova, Polina, and Olivier Debeir. "Correlations between the Topography-Induced Gravity, Terrain Structure and the Seismicity in the Gulf of Panama." Environmental Research, Engineering and Management 79, no. 2 (2023): 64–76. http://dx.doi.org/10.5755/j01.erem.79.2.33500.

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This study presents new maps of the topographic and geophysical setting and seismicity in the region of the Gulf of Panama. The spatial analysis is based on the comparative analysis of the datasets on geoid, free-air gravity anomaly, topography and earthquakes. The cartographic framework is developed using the Generic Mapping Tools (GMT) scripting toolset. Seismic activity in the Central America is high due to the complex geologic setting, tectonic activity and lithosphere plate subduction. The data include the Earth Gravitational Model (EGM2008), the General Bathymetric Chart of the Oceans (G

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Lemenkova, Polina, and Olivier Debeir. "Correlations between the Topography-Induced Gravity, Terrain Structure and the Seismicity in the Gulf of Panama." Environmental Research, Engineering and Management 79, no. 2 (2023): 64–76. https://doi.org/10.5281/zenodo.8160090.

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This study presents new maps of the topographic and geophysical setting and seismicity in the region of the Gulf of Panama. The spatial analysis is based on the comparative analysis of the datasets on geoid, free-air gravity anomaly, topography and earthquakes. The cartographic framework is developed using the Generic Mapping Tools (GMT) scripting toolset. Seismic activity in the Central America is high due to the complex geologic setting, tectonic activity and lithosphere plate subduction. The data include the Earth Gravitational Model (EGM2008), the General Bathymetric Chart of the Oceans (G

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Simonov, Konstantin V., Valentin B. Kashkin, Тatyana V. Rubleva, and Konstantin V. Krasnoshekov. "Analysis of GRACE satellite measurements over seismically active areas of the strongest earthquakes." E3S Web of Conferences 75 (2019): 02007. http://dx.doi.org/10.1051/e3sconf/20197502007.

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The study is devoted to the analysis of the features of the change in the parameter EWH (Equivalent Water Height) over the geoid from the satellite measurements of the GRACE space system in seismically active areas of the strongest underwater earthquakes. The GRACE satellite data archive was created. An interpretation of the disturbed state of the geomedium using digital maps of the spatial distribution of the parameter EWH is performed.

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Shendrik, N. K. "Method of forming digital models of geoid heights for reference coordinate systems." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 28, no. 2 (2023): 40–46. http://dx.doi.org/10.33764/2411-1759-2023-28-2-40-46.

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A technique was developed for generating digital models of geoid heights for reference coordinate systems using the Trimble Bussines Center software (TBC software). The source models can be the publicly available high-precision global geoid elevation models EGM2008, EIGEN6C4 and other models whose files with the *.ggf extension are compatible with the TBC software. The technique is based on the possibility of exporting orthometric heights from the TBC software in ASCII format to a user-specified area on the surface of the global WGS-84 ellipsoid for a uniform grid of nodes in lati-tude and lon

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Matsulev, A. N., and K. V. Simonov. "Interpretation of grace system data for solving geodynamic monitoring tasks." Informatization and communication, no. 2 (April 30, 2020): 67–72. http://dx.doi.org/10.34219/2078-8320-2020-11-2-67-72.

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The study is devoted to the analysis of the features of the change in the EWH (Equivalent Water Height) parameter over the geoid by satellite measurements of the GRACE space system in various regions of the World Ocean. A GRACE satellite data archive has been created. The perturbed state of the geomedium is interpreted using digital maps of the spatial distribution of the EWH parameter based on the histogram approach and correlation analysis.

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Lemenkova, Polina. "GRASS GIS for topographic and geophysical mapping of the Peru-Chile Trench." Forum geografic 19, no. 2 (2021): 143–57. https://doi.org/10.5281/zenodo.4570553.

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The study area is located along the western continental margins of South America, Peru-Chile Trench south-east Pacific Ocean, geographically encompasses 90° to 60°W longitude and 55°S to 0° latitude. The study aims to perform a spatial analysis using GRASS GIS approach applied for processing and visualizing topographic and geophysical data on the study area. Data include following raster grids: topographic SRTM_15PLUS raster grid with 15 arc-second resolution, geoid model (EGM96), geophysical fields and gravity maps (marine free-air gravity and vertically corrected free-air gra

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Eteje, S. O., and P. D. Oluyori. "Spatial Distribution of Survey Controls and Effect on Accuracy of Geometric Geoid Models (Multi-quadratic and Bicubic) in FCT, Abuja." Scientific Research Journal (SCIRJ) 7, no. 5 (2019): 29–35. https://doi.org/10.5281/zenodo.3242137.

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Spatially distributed studies may follow two broad approaches: points that are randomly located and points that are clustered or clumped together. They are discussed within a discipline described as geo-statistics. Geo-statistics is applied in order to interpolate geoid undulation (N) and hence generate through a geoid model orthometric heights from scattered/random or closely/clustered located controls. Control points are coordinated points within a primary/secondary geodetic survey network. Kriging method was adopted to produce topographical maps of the both scattered and closely scenarios.

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Lemenkova, Polina. "Sediment thickness in the Bay of Bengal and Andaman Sea compared with topography and geophysical settings by GMT." Ovidius University Annals of Constanta - Series Civil Engineering 22, no. 1 (2020): 13–21. http://dx.doi.org/10.2478/ouacsce-2020-0002.

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Abstract The study presents an analysis of the sediment thickness compared with bathymetric and geophysical settings in the Bay of Bengal and Andaman Sea, Indian Ocean. It uses a combination of the high-resolution data: topographic GEBCO, satellite and marine gravity anomalies, EGM2008 geoid and GlobSed to visualize the correlation between relief, gravity and trends in continent-ocean sediment transport. The results include thematic maps and 3D model showing increased sediment thickness in the Bengal Fan (8,0 to 8,2 km) in NE direction with maximum in Ganges Fan (16,2 km), and southward decrea

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Lemenkova, Polina. "Sediment thickness in the Bay of Bengal and Andaman Sea compared with topography and geophysical settings by GMT." Ovidius University Annals Series: Civil Engineering 22 (January 12, 2021): 13–22. https://doi.org/10.2478/ouacsce-2020-0002.

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The study presents an analysis of the sediment thickness compared with bathymetric and geophysical settings in the Bay of Bengal and Andaman Sea, Indian Ocean. It uses a combination of the high-resolution data: topographic GEBCO, satellite and marine gravity anomalies, EGM2008 geoid and GlobSed to visualize the correlation between relief, gravity and trends in continent-ocean sediment transport. The results include thematic maps and 3D model showing increased sediment thickness in the Bengal Fan (8,0 to 8,2 km) in NE direction with maximum in Ganges Fan (16,2 km), and southward decrease in the

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Lemenkova, Polina, and Olivier Debeir. "Coherence of Bangui Magnetic Anomaly with Topographic and Gravity Contrasts across Central African Republic." Minerals 13, no. 5 (2023): 604. http://dx.doi.org/10.3390/min13050604.

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The interactions between the geophysical processes and geodynamics of the lithosphere play a crucial role in the geologic structure of the Earth’s crust. The Bangui magnetic anomaly is a notable feature in the lithospheric structure of the Central African Republic (CAR) resulting from a complex tectonic evolution. This study reports on the coherence in the geophysical data and magnetic anomaly field analysed from a series of maps. The data used here include raster grids on free-air altimetric gravity, magnetic EMAG2 maps, geoid EGM2008 model and topographic SRTM/ETOPO1 relief. The data were pr

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Ержанқызы, А., С. М. Нуракынов, А. М. Бермуханова та М. С. Қожахметов. "ПОСТРОЕНИЕ БАЗЫ ДАННЫХ ГРАВИМЕТРИЧЕСКОЙ ИНФОРМАЦИИ ДЛЯ МОДЕЛИ ГЕОИДА КАЗАХСТАНА". Горный журнал Казахстана, № 6(242) (24 червня 2025): 55–60. https://doi.org/10.48498/minmag.2025.242.6.003.

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В статье описан процесс разработки геопространственной базы данных для гравиметрической карты масштаба 1:200000 в среде ArcGIS. База данных стандартизирует, интегрирует разнородные гравиметрические данные, включая исторические и современные измерения. Гравиметрические данные играют ключевую роль в моделировании геоида, а разработанная база обеспечивает эффективное хранение, обработку и анализ информации, способствует решению геодезических и геофизических задач на национальном уровне. Основу данных составляют изданные и подготовленные к изданию гравиметрические карты в редукции Буге (бпр. = 2.6

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Kamguia, J., R. Nouayou, C. T. Tabod, J. M. Tadjou, E. Manguelle-Dicoum, and H. L. Kande. "Geophysical signature of geological units inferred from the analysis of geoid maps in Cameroon and its surroundings." Journal of African Earth Sciences 52, no. 1-2 (2008): 1–8. http://dx.doi.org/10.1016/j.jafrearsci.2008.02.002.

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Fazilova, Dilbarkhon, and Khasan Magdiev. "Creating and updating of topographic maps height base in the new national spatial coordinate system: case Fergana valley." InterCarto. InterGIS 27, no. 2 (2021): 155–64. http://dx.doi.org/10.35595/2414-9179-2021-2-27-155-164.

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The use of high-precision technology of the global navigation satellite system (GNSS) has put forward the task of developing the methods for the creation and the use of a new national open coordinate system in the Republic of Uzbekistan. In the country, up to now the CS42 coordinate system, based on the Krasovsky ellipsoid used for geodetic works. The Baltic normal system of heights (1977), tied to the mean sea level with the zero mark of the Kronstadt tide gauge, was adopted as a height datum. Due to lack geoid information for the territory of the country determined by modern methods, the rea

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Simonov, K. V., V. B. Kashkin, T. V. Rubleva, et al. "Methods for interpreting grace system data for solving geodynamic monitoring problems." Informatization and communication, no. 2 (February 16, 2021): 69–75. http://dx.doi.org/10.34219/2078-8320-2021-12-2-69-75.

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The study is devoted to a detailed analysis of observational data from the GRACE space system to clarify the parameters of a catastrophic earthquake with a magnitude of MW = 8.8, which occurred in the subduction zone near the coast of Chile. Digital maps of changes in the EWH parameter over the geoid contour in the investigated seismically active region of the Chilean earthquakes of 2014 and 2015 were constructed. It is shown that there is a negative correlation between the value of the geodynamic parameter H for a strong earthquake with M W = 8.8 (distance from the hypocenter to the position

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Lemenkova, Polina, and Olivier Debeir. "Coherence of Bangui Magnetic Anomaly with Topographic and Gravity Contrasts across Central African Republic." Minerals 13, no. 5 (2023): 604. https://doi.org/10.5281/zenodo.7870446.

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The interactions between the geophysical processes and geodynamics of the lithosphere play a crucial role in the geologic structure of the Earth’s crust. The Bangui magnetic anomaly is a notable feature in the lithospheric structure of the Central African Republic (CAR) resulting from a complex tectonic evolution. This study reports on the coherence in the geophysical data and magnetic anomaly field analysed from a series of maps. The data used here include raster grids on free-air altimetric gravity, magnetic EMAG2 maps, geoid EGM2008 model and topographic SRTM/ETOPO1 relief. The data w

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Laxon, S. W., and C. G. Rapley. "Satellite-Altimeter Measurements of Surface Height in Sea-Ice Areas (Abstract)." Annals of Glaciology 9 (1987): 240. http://dx.doi.org/10.3189/s0260305500000768.

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The Seasat radar altimeter was designed to operate over the open ocean and encountered problems over sea ice. In particular, the on-board measurements of surface height were noisy and unreliable. As a consequence, published mean sea-surface and geoid maps based on the Seasat on-board height estimates either omit sea-ice-covered areas or include suspect data. We have identified and investigated the problems encountered by the Seasat altimeter over sea ice and have developed a technique for extracting accurate surface-height values from the sea-ice echo wave-form data. The retracking method is b

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Laxon, S. W., and C. G. Rapley. "Satellite-Altimeter Measurements of Surface Height in Sea-Ice Areas (Abstract)." Annals of Glaciology 9 (1987): 240. http://dx.doi.org/10.1017/s0260305500000768.

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The Seasat radar altimeter was designed to operate over the open ocean and encountered problems over sea ice. In particular, the on-board measurements of surface height were noisy and unreliable. As a consequence, published mean sea-surface and geoid maps based on the Seasat on-board height estimates either omit sea-ice-covered areas or include suspect data. We have identified and investigated the problems encountered by the Seasat altimeter over sea ice and have developed a technique for extracting accurate surface-height values from the sea-ice echo wave-form data. The retracking method is b

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Simonov, Konstantin, and Alexander Matsulev. "Comparative analysis and interpretation of grace and grace-fo data." Informatization and communication 4 (November 2020): 101–6. http://dx.doi.org/10.34219/2078-8320-2020-11-4-101-106.

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The study is devoted to the analysis of the features of the change in the Equivalent Water Height (EWH) parameter over the geoid based on satellite measurements of space systems. The study used the GRACE and GRACE-FO satellite data archive. The assessment was carried out on Earth as a whole, including land areas and the World Ocean. Interpretation of the anomalous state of the geoenvironment is performed using digital maps of the spatial distribution of the EWH parameter based on the histogram approach and correlation analysis. Also, a comparative analysis of the studied data from the GRACE mi

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De Souza, Larissa Messias, and Alessandra Svonka Palmeiro. "Análise da influência das correções geofísicas em dados de altimetria por satélite na região de Imbituba-SC." Revista Brasileira de Geomática 8, no. 4 (2020): 299. http://dx.doi.org/10.3895/rbgeo.v8n4.10629.

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O estudo do geoide está diretamente relacionado ao Nível Médio do Mar (NMM), uma vez que o mesmo corresponde à superfície equipotencial do NMM prolongada sobre os continentes sem perturbações. Devido à ausência e dificuldade nas informações gravimétricas em determinadas regiões, informações estas necessárias à determinação do geoide e de sistemas de altitude físicas, a técnica de Altimetria por Satélites (ALTSAT), permite a determinação das altitudes da superfície do mar, através das informações acerca do oceano. Porém, na referida técnica existem erros no processo de geração da massa de dados

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Matveev, S. I., and A. S. Matveev. "On the establishment of an unified global rectangular coordinates for the whole of Russia." Geodesy and Cartography 919, no. 1 (2017): 52–54. http://dx.doi.org/10.22389/0016-7126-2017-919-1-52-54.

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This article deals with the problem of creating unitary global space orthogonal geocentric coordinatesystem throughout Russia on the base of a geoid. This problem arose on Resolution of The Russian Federation Government. The point is that geodesic coordinates B, L and H are acceptable for moving and navigation of transport, but orthogonal coordinates X and Y are in the equatorial plane and have nothing to do with designing and construction. Adaptive systems unite global orthogonal coordinates. That is why the authors set the goal of using polyhedral projections. All maps compiled and used in R

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Lemenkova, Polina. "Geocomputation of DEM Based Terrain Relief in Bulgaria Using GMT and R Scripting Approaches." Annual of the University of Architecture, Civil Engineering and Geodesy Sofia 55, no. 1 (2022): 169–81. https://doi.org/10.5281/zenodo.6405154.

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This paper analyzes two scripting approaches for topographic and geodetic visualization and geomorphological modeling of Bulgaria: R language and Generic Mapping Tools (GMT). The data include high-resolution raster grids: topographic datasets (GEBCO, SRTM), geoid model based on Earth Gravitational Model 2008 (EGM-2008) and DEM for geomorphological modeling of terrain: slope, aspect, hillshade and elevation. Scripting mapping was used as a replacement of the standard GIS methods of data visualization by a programming approach which is beneficial for the mapping workflow in terms of effectivenes

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Maximenko, Nikolai, Peter Niiler, Luca Centurioni, et al. "Mean Dynamic Topography of the Ocean Derived from Satellite and Drifting Buoy Data Using Three Different Techniques*." Journal of Atmospheric and Oceanic Technology 26, no. 9 (2009): 1910–19. http://dx.doi.org/10.1175/2009jtecho672.1.

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Abstract Presented here are three mean dynamic topography maps derived with different methodologies. The first method combines sea level observed by the high-accuracy satellite radar altimetry with the geoid model of the Gravity Recovery and Climate Experiment (GRACE), which has recently measured the earth’s gravity with unprecedented spatial resolution and accuracy. The second one synthesizes near-surface velocities from a network of ocean drifters, hydrographic profiles, and ocean winds sorted according to the horizontal scales. In the third method, these global datasets are used in the cont

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Tenzer, Robert, and Peter Vajda. "Global atmospheric effects on the gravity field quantities." Contributions to Geophysics and Geodesy 39, no. 3 (2009): 221–36. http://dx.doi.org/10.2478/v10126-009-0008-2.

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Global atmospheric effects on the gravity field quantitiesWe compile the global maps of atmospheric effects on the gravity field quantities using the spherical harmonic representation of the gravitational field. A simple atmospheric density distribution is assumed within a lower atmosphere (< 6 km). Disregarding temporal and lateral atmospheric density variations, the radial atmospheric density model is defined as a function of the nominal atmospheric density at the sea level and the height. For elevations above 6 km, the atmospheric density distribution from the United States Standard Atmo

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Sajjadi, Sajjad, Zdeněk Martinec, Patrick Prendergast, et al. "The unification of gravity data for Ireland-Northern Ireland." Leading Edge 39, no. 2 (2020): 135–43. http://dx.doi.org/10.1190/tle39020135.1.

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The systematic biases and errors associated with gravity data in Ireland and Northern Ireland and the conversion of gravity to a consistent and unified system are analyzed. The gravity data in Ireland and Northern Ireland are given in different coordinate systems (Irish Grid and Irish Transverse Mercator), different gravity base stations (Dunsink and Cambridge), and different vertical datums (Malin Head and Belfast tide gauge). The conversion of the gravity data to a consistent system, which refers to unified coordinates, base station, and vertical datum, is essential in geophysics and geodesy

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Lycourghiotis, Sotiris, та Foteini Kariotou. "Τhe “GPS/GNSS on Boat” Technique for the Determination of the Sea Surface Topography and Geoid: A Critical Review". Coasts 2, № 4 (2022): 323–40. http://dx.doi.org/10.3390/coasts2040016.

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The opening up of the global positioning system (GPS) for non-military uses provided a new impetus for the study of the sea surface topography (SST) and geoid, especially in coastal areas which are important from the viewpoint of the climate crisis. The application of the “GPS/GNSS on boat” method, as an alternative to traditional (indirect and direct) methods, has provided detailed SST maps in coastal and oceanic areas with an accuracy of up to few centimeters. In this work we present the first critical review concerning the evolution of the “GPS/GNSS on boat” method over a period of 27 years

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Lemenkova, Polina. "Cartographic scripts for seismic and geophysical mapping of Ecuador." Geografie 127, no. 3 (2022): 195–218. https://doi.org/10.5281/zenodo.7128975.

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This research describes a script-based method of Generic Mapping Tools (GMT) for mapping the seismicity, geophysics, geology and topography of Ecuador. The advances of GMT include the following points: (1) automation of workflow; (2) refined aesthetics of graphics; (3) speed console-based mapping; (4) multi-format data handling; (5) advanced syntax. An explanation of scripting with the examples of code snippets is provided. The results present six new maps of Ecuador. The distribution of geophysical phenomena and seismicity is compared to the terrain elevation, showing remarkable correlations

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Lemenkova, Polina. "Mapping Beaufort Sea Topography and Geophysical Settings Using High-Resolution Geospatial Data and GMT." Geografické informácie 24, no. 1 (2020): 4–18. https://doi.org/10.17846/GI.2020.24.1.4-18.

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The papers presents an integrated processing of the high-resolution thematic data covering the area of the Beaufort Sea, a marginal sea of the Arctic Ocean, northern Canada and Alaska. Five thematic maps of the Beaufort Sea, Arctic Ocean are presented. The cartographic techniques were performed by Generic Mapping Tools (GMT) scripting toolset. The methodology presents the integration of the multi-source high-resolution thematic datasets: bathymetric GEBCO, IBCAO, topographic GLOBE, sediment thickness GlobSed, EGM2008 geoid model, GMT vector layers and geophysical gravity model from CryoSat-2 a

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Lemenkova, Polina. "A Script-Driven Approach to Mapping Satellite-Derived Topography and Gravity Data Over the Zagros Fold-and-Thrust Belt, Iran." Artificial Satellites 57, no. 2 (2022): 110–37. http://dx.doi.org/10.2478/arsa-2022-0006.

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Abstract Integrated geophysical mapping benefits from visualizing multi-source datasets including gravity and satellite altimetry data using 2D and 3D techniques. Applying scripting cartographic approach by R language and GMT supported by traditional mapping in QGIS is presented in this paper with a case study of Iranian geomorphology and a special focus on Zagros Fold-and-Thrust Belt, a unique landform of the country affected by complex geodynamic structure. Several modules of GMT and ’tmap’ and ’raster’ packages of R language were shown to illustrate the efficiency of the console-based mappi

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Lemenkova, Polina. "A Script-Driven Approach to Mapping Satellite-Derived Topography and Gravity Data Over the Zagros Fold-and-Thrust Belt, Iran." Artificial Satellites 57, no. 2 (2022): 110–37. https://doi.org/10.5281/zenodo.6922181.

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Integrated geophysical mapping benefits from visualizing multi-source datasets including gravity and satellite altimetry data using 2D and 3D techniques. Applying scripting cartographic approach by R language and GMT supported by traditional mapping in QGIS is presented in this paper with a case study of Iranian geomorphology and a special focus on Zagros Fold-and-Thrust Belt, a unique landform of the country affected by complex geodynamic structure. Several modules of GMT and 'tmap' and 'raster' packages of R language were shown to illustrate the efficiency of the console-base

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Lemenkova, Polina. "Mapping topographic, geophysical and gravimetry data of Pakistan – a contribution to geological understanding of Sulaiman Fold Belt and Muslim Bagh Ophiolite Complex." Geophysica 56, no. 1-2 (2021): 3–26. https://doi.org/10.5281/zenodo.5779189.

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Along with the development of the scripting technology in cartography, such as the Generic Mapping Tools (GMT) and libraries of R programming language, geologic and geophysical mapping is being vigorously promoted, where the integration of the thematic data, such as GEBCO/SRTM, EGM-2008 and open geological raster and vector layers is one of the primary datasets that provides the high- resolution raw sources for cartographic visualization in the geologically complex regions like Pakistan. This study aims to integrate scripting methods of automated cartography, methods of applied geoinformatics

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Ferraz, Rodrigo da Silva, and Sérgio Florêncio de Souza. "A Influência das Edificações no Cálculo do Efeito Gravitacional das Massas Topográficas – Estudo de Caso na Cidade de Porto Alegre – RS (Brasil)." Revista Brasileira de Cartografia 73, no. 1 (2021): 134–49. http://dx.doi.org/10.14393/rbcv73n1-55253.

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Um dos objetivos da Geodésia consiste no estudo do geoide e sua determinação é obtida através do conhecimento do campo de gravidade que envolve a distribuição de massas na superfície terrestre. A abordagem clássica para a solução do problema de valor de contorno da Geodésia (PVCG) visando a determinação do geoide assume que os efeitos associados à topografia sejam levados em consideração. A técnica de Modelagem da Topografia Residual (RTM, em inglês Residual Terrain Modelling) tem como objetivo a modelagem o campo de gravidade em função da distribuição de massas associada a topografia onde, ne

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