Centre de documentation
scientifique

What have we learnt from Icesat on Greenland ice sheet change and what to expect from Icesat 2 / Blaženka Bukač in Geodetski vestnik, vol 65 n° 1 (March - May 2021)  

Public [article]  inGeodetski vestnik > vol 65 n° 1 (March - May 2021) . - pp 94 - 109 Titre : What have we learnt from Icesat on Greenland ice sheet change and what to expect from Icesat 2 Type de document : Article/Communication Auteurs : Blaženka Bukač, Auteur ; Marijan Grgić, Auteur ; Tomislav Basic, Auteur Année de publication : 2021 Article en page(s) : pp 94 - 109 Note générale : bibliographie Langues : Anglais (eng) Slovène (slv) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altimétrie satellitaire par laser [Termes IGN] bilan de masse [Termes IGN] calotte glaciaire [Termes IGN] champ de pesanteur terrestre [Termes IGN] données GRACE [Termes IGN] données ICEsat [Termes IGN] glace de mer [Termes IGN] glacier [Termes IGN] Groenland [Termes IGN] levé gravimétrique Résumé : (auteur) Ice-sheet mass balance and ice behaviour have been effectively monitored remotely by space-borne laser ranging technology, i.e. satellite laser altimetry, and/or satellite gravimetry. ICESat mission launched in 2003 has pioneered laser altimetry providing a large amount of elevation data related to ice sheet change with high spatial and temporal resolution. ICESat-2, the successor to the ICESat mission, was launched in 2018, continuing the legacy of its predecessor. This paper presents an overview of the satellite laser altimetry and a review of Greenland ice sheet change estimated from ICESat data and compared against estimates derived from satellite gravimetry, i.e. changes of the Earth’s gravity field obtained from the GRACE data.I n addition to that, it provides an insight into the characteristics and possibilities of ice sheet monitoring with renewed mission ICESat-2, which was compared against ICESat for the examination of ice height changes on the Jakobshavn glacier. ICESat comparison (2004–2008) shows that an average elevation change in different areas on Greenland varies up to ±0.60 m yr−1. Island’s coastal southern regions are most affected by ice loss, while inland areas record near-balance state. In the same period, gravity anomaly measurements showed negative annual mass balance trends in coastal regions ranging from a few cm up to-0.36 m yr-1 w.e.(water equivalent), while inlandrecords show slightly positive trends. According to GRACE observations, in the following years (2009–2017), negative annual mass balance trends on the coast continued. Numéro de notice : A2021-313 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.15292/geodetski-vestnik.2021.01.94-109 Date de publication en ligne : 15/01/2021 En ligne : https://doi.org/10.15292/geodetski-vestnik.2021.01.94-109 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97516 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
139-2021011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The impact of terrestrial gravity data density on geoid accuracy: case study Bilogora in Croatia / Olga Bjelotomić Oršulić in Survey review, vol 52 n° 373 (July 2020)  

Public [article]  inSurvey review > vol 52 n° 373 (July 2020) . - pp 299 - 308 Titre : The impact of terrestrial gravity data density on geoid accuracy: case study Bilogora in Croatia Type de document : Article/Communication Auteurs : Olga Bjelotomić Oršulić, Auteur ; Danko Markovinović, Auteur ; Matej Varga, Auteur ; Tomislav Basic, Auteur Année de publication : 2020 Article en page(s) : pp 299 - 308 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Croatie [Termes IGN] données CHAMP [Termes IGN] géoïde [Termes IGN] gravimétrie terrestre [Termes IGN] levé gravimétrique [Termes IGN] quasi-géoïde [Termes IGN] station d'observation Résumé : (auteur) One of the main challenges in physical geodesy today is achieving the 1-centimetre gravimetric quasi-geoid model, since a model of such accuracy could be used in the definition and realisation of the height reference frame. One of the main obstacles in this challenge is the lack of terrestrial gravity data or its uneven distribution. Therefore, the main question arises: what density of gravity points is necessary in order to obtain a gravimetric quasi-geoid model with an accuracy of 1 centimetre or even better? In this simulated study, the results show a trend of decreasing RMS related to the sparser dataset used in computation, leading to the conclusion that the determination of the sub-centimetre quasi-geoid model is no longer a theory, but can be achieved with the exact density of terrestrial gravity data: gravity observation stations have to be distributed no farther than 500 m from one another. When dealing with a very rough topography, the distance should be even shorter. Numéro de notice : A2020-456 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2018.1562747 Date de publication en ligne : 13/01/2020 En ligne : https://doi.org/10.1080/00396265.2018.1562747 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95555 [article]

Fundamental gravity network of the Republic Croatia in the function of control and improving of national and European geoid model / I. Grgic (01/01/2010)

Public contenu dans Second proceedings of the Croatian Geodetic Institute for the period 2006-2009 / Croatian geodetic institute (2010) Titre : Fundamental gravity network of the Republic Croatia in the function of control and improving of national and European geoid model Type de document : Article/Communication Auteurs : I. Grgic, Auteur ; B. Barisic, Auteur ; Tomislav Basic, Auteur ; et al., Auteur Editeur : Zagreb [Croatie] : Croatian geodetic institute Année de publication : 01/01/2010 Conférence : CGI 2009, 2nd proceedings of the Croatian Geodetic Institute for the period 2006-2009 Zagreb Croatie Importance : pp 82 - 94 Note générale : Bibliographie Langues : Anglais (eng) Serbo-croate (Latin) (scr) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Croatie [Termes IGN] European vertical GPS reference network [Termes IGN] géoïde local Résumé : (Auteur) By demand for densification of EUVN_DA network with additional points on state territory, Republic Croatia is again activated in project EUVN_DA on national level in year 2005. During project EUVN_DA network is expanded from 8 existing points to 20 points. Difference between EGG97 and EUVN model showed possible errors on some areas or points (HR05 Split). Therefore, those errors were eliminated by measurements and results were free of errors from first EUVN campaign in year 1997. Differences between national model of geoid HRG2000 and EUVN show better adjustment of geoid surface for state area than continen-tal EGG97 geoid. Therefore they are additional control in densification of EUVN_DA project. Result analysis along coast showed large differences between geoid models. From the old gravi-ty network (84 gravity points) 25 gravity points were used. After stabilization of 11 new gravity points Basic Gravity Network comprises 36 gravity points. Finalization of establishment of the Fundamental Gravity Network of the Republic of Croatia is also planned to improve absolute national geoid orientation. As well, EUVN points in Croatia, based on Fundamental Gravity Network, will ensure better identification of geoid differences on continental level. Numéro de notice : C2007-004 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65035

Proposal of nomenclatures of the new official sheets of the Republic of Croatia / Z. Hecimovic (01/01/2010)

Public contenu dans Second proceedings of the Croatian Geodetic Institute for the period 2006-2009 / Croatian geodetic institute (2010) Titre : Proposal of nomenclatures of the new official sheets of the Republic of Croatia Type de document : Article/Communication Auteurs : Z. Hecimovic, Auteur ; Z. Jakir, Auteur ; Tomislav Basic, Auteur Editeur : Zagreb [Croatie] : Croatian geodetic institute Année de publication : 01/01/2010 Conférence : CGI 2009, 2nd proceedings of the Croatian Geodetic Institute for the period 2006-2009 Zagreb Croatie Importance : pp 425 - 437 Note générale : Bibliographie Langues : Anglais (eng) Serbo-croate (Latin) (scr) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] Croatie [Termes IGN] échelle cartographique [Termes IGN] projection [Termes IGN] spécification [Termes IGN] système de coordonnées Résumé : (Auteur) This paper is describing nomenclatures proposal of the new official map sheets of the Republic of Croatia followed by recently establishment of new official projection referent coordinate system of the Republic of Croatia (HTRS96/TM). The new map grids are made for official cartographic map scales. The new nomenclature system is developed for the offi-cial cartographic map scales: 1:250 000, 1:100 000, 1:50 000, 1:25 000, 1:10 000, 1:5 000, 1:2 000, 1:1 000 and 1:500. Nomenclature is represented of unique alphanumeric syntax. Sheet indexing using unique integer is more suitable considering Information and Communications Technologies (ICT). Every map sheet has the nomenclature and the unique integer index. Numéro de notice : C2009-015 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65055

Oceanwide prediction of gravity anomalies and sea surface heights using GEOS-3, Seasat, and Geosat altimeter data and Etopo5u bathymetric data / Tomislav Basic (1992)

Public Titre : Oceanwide prediction of gravity anomalies and sea surface heights using GEOS-3, Seasat, and Geosat altimeter data and Etopo5u bathymetric data Type de document : Monographie Auteurs : Tomislav Basic, Auteur ; R.H. Rapp, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1992 Collection : Department of Geodetic Science and Surveying Reports num. 416 Importance : 89 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Nivellement [Termes IGN] anomalie de pesanteur [Termes IGN] bathymétrie [Termes IGN] données altimétriques [Termes IGN] GEOSAT [Termes IGN] pesanteur terrestre [Termes IGN] Seasat [Termes IGN] surface de la mer Index. décimale : 30.50 Nivellement - généralités Numéro de notice : 12096 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54526

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
12096-01	30.50	Livre	Centre de documentation	Géodésie	Disponible

Long range geoid control through the european GPS traverse / Wolfgang Torge (1989)

Permalink