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Application of the PCA/EOF method for the analysis and modelling of temporal variations of geoid heights over Poland / Walyeldeen Godah in Acta geodaetica et geophysica, vol 52 n° 4 (December 2017)  

Public [article]  inActa geodaetica et geophysica > vol 52 n° 4 (December 2017) . - pp 1 - 13 Titre : Application of the PCA/EOF method for the analysis and modelling of temporal variations of geoid heights over Poland Type de document : Article/Communication Auteurs : Walyeldeen Godah, Auteur ; Malgorzata Szelachowska, Auteur ; Jan Krynski, Auteur Année de publication : 2017 Article en page(s) : pp 1 - 13 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] altitude [Termes descripteurs IGN] analyse en composantes principales [Termes descripteurs IGN] données GRACE [Termes descripteurs IGN] géoïde local [Termes descripteurs IGN] Pologne [Termes descripteurs IGN] variation temporelle Résumé : (auteur) Temporal variations of geoid heights are vitally important in geodesy and Earth science. They are essentially needed for dynamic and kinematic updates of the static geoid model. These temporal variations, which substantially differ for different geographic locations, can successfully be determined using the Gravity Recovery And Climate Experiment (GRACE) mission data. So far, statistical decomposition methods, e.g. the Principal Component Analysis/Empirical Orthogonal Function (PCA/EOF) method, have not been implemented for the analysis and modelling of temporal mass variations within the Earth’s system over the area of Poland. The aim of this contribution is to analyse and model temporal variations of geoid heights obtained from GRACE mission data over the area of Poland using the PCA/EOF method. Temporal variations of geoid heights were obtained from the latest release, i.e. release five, of monthly GRACE-based Global Geopotential Models. They can reach the level of 10 mm. The PCA modes and their corresponding EOF loading patterns were estimated using two different algorithms. The results obtained revealed that significant part of the signal of temporal variations of geoid heights over Poland can be obtained from the first three PCA modes and EOF loading patterns. They demonstrate the suitability of the PCA/EOF method for analysing and modelling temporal variations of geoid heights over the area investigated. Numéro de notice : A2017-750 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s40328-017-0206-8 En ligne : https://doi.org/10.1007/s40328-017-0206-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89033 [article]

On the estimation of physical height changes using GRACE satellite mission data – A case study of Central Europe / Walyeldeen Godah in Geodesy and cartography, vol 66 n° 2 (December 2017)  

Public [article]  inGeodesy and cartography > vol 66 n° 2 (December 2017) . - pp 211 - 226 Titre : On the estimation of physical height changes using GRACE satellite mission data – A case study of Central Europe Type de document : Article/Communication Auteurs : Walyeldeen Godah, Auteur ; Malgorzata Szelachowska, Auteur ; Jan Krynski, Auteur Année de publication : 2017 Article en page(s) : pp 211 - 226 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] altitude orthométrique [Termes descripteurs IGN] analyse en composantes principales [Termes descripteurs IGN] données GRACE [Termes descripteurs IGN] Europe centrale [Termes descripteurs IGN] modèle de géopotentiel [Termes descripteurs IGN] variation saisonnière Résumé : (auteur) The dedicated gravity satellite missions, in particular the GRACE (Gravity Recovery and Climate Experiment) mission launched in 2002, provide unique data for studying temporal variations of mass distribution in the Earth’s system, and thereby, the geometry and the gravity field changes of the Earth. The main objective of this contribution is to estimate physical height (e.g. the orthometric/normal height) changes over Central Europe using GRACE satellite mission data as well as to analyse them and model over the selected study area. Physical height changes were estimated from temporal variations of height anomalies and vertical displacements of the Earth surface being determined over the investigated area. The release 5 (RL05) GRACE-based global geopotential models as well as load Love numbers from the Preliminary Reference Earth Model (PREM) were used as input data. Analysis of the estimated physical height changes and their modelling were performed using two methods: the seasonal decomposition method and the PCA/ EOF (Principal Component Analysis/Empirical Orthogonal Function) method and the differences obtained were discussed. The main findings reveal that physical height changes over the selected study area reach up to 22.8 mm. The obtained physical height changes can be modelled with an accuracy of 1.4 mm using the seasonal decomposition method. Numéro de notice : A2017-788 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/geocart-2017-0013 En ligne : https://doi.org/10.1515/geocart-2017-0013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89100 [article]

Application of the PCA/EOF method for the analysis and modelling of temporal variations of geoid heights over Poland / Walyeldeen Godah in Acta geodaetica et geophysica, vol inconnu (September 2017)  

Public [article]  inActa geodaetica et geophysica > vol inconnu (September 2017) Titre : Application of the PCA/EOF method for the analysis and modelling of temporal variations of geoid heights over Poland Type de document : Article/Communication Auteurs : Walyeldeen Godah, Auteur ; Malgorzata Szelachowska, Auteur ; Jan Krynski, Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] altitude [Termes descripteurs IGN] analyse en composantes principales [Termes descripteurs IGN] géoïde local [Termes descripteurs IGN] Pologne [Termes descripteurs IGN] variation temporelle Résumé : (auteur) Temporal variations of geoid heights are vitally important in geodesy and Earth science. They are essentially needed for dynamic and kinematic updates of the static geoid model. These temporal variations, which substantially differ for different geographic locations, can successfully be determined using the Gravity Recovery And Climate Experiment (GRACE) mission data. So far, statistical decomposition methods, e.g. the Principal Component Analysis/Empirical Orthogonal Function (PCA/EOF) method, have not been implemented for the analysis and modelling of temporal mass variations within the Earth’s system over the area of Poland. The aim of this contribution is to analyse and model temporal variations of geoid heights obtained from GRACE mission data over the area of Poland using the PCA/EOF method. Temporal variations of geoid heights were obtained from the latest release, i.e. release five, of monthly GRACE-based Global Geopotential Models. They can reach the level of 10 mm. The PCA modes and their corresponding EOF loading patterns were estimated using two different algorithms. The results obtained revealed that significant part of the signal of temporal variations of geoid heights over Poland can be obtained from the first three PCA modes and EOF loading patterns. They demonstrate the suitability of the PCA/EOF method for analysing and modelling temporal variations of geoid heights over the area investigated. Numéro de notice : A2017-565 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s40328-017-0206-8 En ligne : https://doi.org/10.1007/s40328-017-0206-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86650 [article]

Gravity field modelling and gravimetry / Jan Krynski in Geodesy and cartography, vol 64 n° 2 (December 2015)  

Public [article]  inGeodesy and cartography > vol 64 n° 2 (December 2015) . - pp 177 - 200 Titre : Gravity field modelling and gravimetry Type de document : Article/Communication Auteurs : Jan Krynski, Auteur Année de publication : 2015 Article en page(s) : pp 177 - 200 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] anomalie de pesanteur [Termes descripteurs IGN] champ de pesanteur local [Termes descripteurs IGN] géoïde local [Termes descripteurs IGN] levé gravimétrique [Termes descripteurs IGN] modèle de géopotentiel local [Termes descripteurs IGN] Pologne Résumé : (auteur) 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. Numéro de notice : A2015--017 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article En ligne : http://dx.doi.org/10.1515/geocart-2015-0012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80813 [article]

Reference frames and reference networks / Jaroslaw Bosy in Geodesy and cartography, vol 64 n° 2 (December 2015)  

Public [article]  inGeodesy and cartography > vol 64 n° 2 (December 2015) . - pp 147 - 176 Titre : Reference frames and reference networks Type de document : Article/Communication Auteurs : Jaroslaw Bosy, Auteur ; Jan Krynski, Auteur Année de publication : 2015 Article en page(s) : pp 147 - 176 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes descripteurs IGN] European Terrestrial Reference System 1989 [Termes descripteurs IGN] Pologne [Termes descripteurs IGN] réseau géodésique local [Termes descripteurs IGN] système de référence local Résumé : (auteur) The summary of research activities concerning reference frames and reference networks performed in Poland in a period of 2011-2014 is presented. It contains the results of research on implementation of IUGG2011 and IAU2012 resolutions on reference systems, implementation of the ETRS89 in Poland, operational work of permanent IGS/ EUREF stations in Poland, operational work of ILRS laser ranging station in Poland, active GNSS station networks in Poland, maintenance of vertical control in Poland, maintenance and modernization of gravity control, and maintenance of magnetic control in Poland. The bibliography of the related works is given in references. Numéro de notice : A2015--016 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article En ligne : http://dx.doi.org/10.1515/geocart-2015-0011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80810 [article]

GDQM-PL13 – the new gravimetric quasigeoid model for Poland / Malgorzata Szelachowska in Geoinformation issues, vol 6 n° 1 (2014)  

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Possibilities of low-low satellite tracking for local geoid improvement / Jan Krynski (1978)

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Numerical studies and programs for interpolation and collocation / Jan Krynski (1977)

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