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GNSS and the Ionosphere: What's in Store for the Next Solar Maximum? / A. Jensen in GPS world, vol 22 n° 2 (February 2011)
[article]
Titre : GNSS and the Ionosphere: What's in Store for the Next Solar Maximum? Type de document : Article/Communication Auteurs : A. Jensen, Auteur ; C. Mitchell, Auteur Année de publication : 2011 Article en page(s) : pp 40 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] dégradation du signal
[Termes IGN] ionosphère
[Termes IGN] perturbation ionosphérique
[Termes IGN] qualité du signal
[Termes IGN] signal aléatoire
[Termes IGN] signal GNSS
[Termes IGN] vent solaireRésumé : (Editeur) Although the sun can become disturbed at any time, solar activity is correlated with the approximately 11-year cycle of spots on the sun's surface. We are just coming out of a minimum in the solar cycle and headed for the next maximum, predicted to occur around the middle of 2013. How significantly will GNSS users be affected? In this month's column, two ionosphere experts tell us what might be in store. Numéro de notice : A2011-058 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30839
in GPS world > vol 22 n° 2 (February 2011) . - pp 40 - 48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2011021 RAB Revue Centre de documentation En réserve L003 Disponible L'environnement / Jacques Vernier (2011)
Titre : L'environnement Type de document : Monographie Auteurs : Jacques Vernier, Auteur Mention d'édition : 10 Editeur : Paris : Presses Universitaires de France - PUF Année de publication : 2011 Collection : Que-sais-je num. 2667 Importance : 127 p. Format : 11 x 18 cm ISBN/ISSN/EAN : 978-2-13-058928-0 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Environnement
[Termes IGN] atmosphère terrestre
[Termes IGN] bruit (audition)
[Termes IGN] faune
[Termes IGN] flore locale
[Termes IGN] pollution
[Termes IGN] ressources en eauNuméro de notice : 62414 Affiliation des auteurs : non IGN Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64049 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 62414-01 81.00 Livre Centre de documentation Généralités Disponible
Titre : Impact of a priori gradients on VLBI-derived terrestrial reference frames Type de document : Article/Communication Auteurs : Johannes Böhm , Auteur ; H. Spicakova, Auteur ; L. Urquhart, Auteur ; et al., Auteur Editeur : Bonn : Universität Bonn Année de publication : 2011 Collection : Schriftenreihe des Instituts für Geodäsie und Geoinformation, ISSN 2699-6685 num. 22 Conférence : EVGA 2011, 20th working meeting of the European VLBI Group for Geodesy and Astrometry 29/03/2011 30/03/2011 Bonn Allemagne OA proceedings Importance : pp 128 - 132 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse diachronique
[Termes IGN] données ITGB
[Termes IGN] gradient de troposphère
[Termes IGN] International Terrestrial Reference FrameRésumé : (Auteur) We compare the influence of two different a priori gradient models on the terrestrial reference frame (TRF) as determined from Very Long Baseline Interferometry (VLBI) observations. One model has been determined by vertical integration over horizontal gradients of refractivity as derived from data of the Goddard Data Assimilation Office (DAO), whereas the second model (APG) has been determined by ray-tracing through monthly mean pressure level re-analysis data of the European Centre for Medium-Range Weather Forecasts. We compare VLBI solutions from 1990.0 to 2011.0 with fixed DAO and APG gradients to a solution with gradients being estimated, and we find better agreement of station coordinates when fixing DAO gradients compared to fixing APG gradients. As a consequence, we recommend that gradients are constrained to DAO gradients, in particular in the early years of VLBI observations (up to about 1990), when the number of stations per session is small and the sky distribution is far from uniform. Later than 1990, the gradients can be constrained loosely and the a priori model is of minor importance. Numéro de notice : C2011-052 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64322 Documents numériques
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14256_evga2011_boehm.pdfAdobe Acrobat PDF The large‐scale water cycle of the West African monsoon / Olivier Bock in Atmospheric Science Letters, vol 12 n° 1 (January - March 2011)
[article]
Titre : The large‐scale water cycle of the West African monsoon Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Françoise Guichard, Auteur ; Rémi Meynadier, Auteur ; Sébastien Gervois, Auteur ; Anna Agustí‐Panareda, Auteur ; Anton Beljaars, Auteur ; Aaron Boone, Auteur ; Mathieu Nuret, Auteur ; Jean-Luc Redelsperger, Auteur ; Pascal Roucou, Auteur Année de publication : 2011 Projets : AMMA & AMMA-2 / Janicot, Serge Article en page(s) : pp 51 - 57 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique occidentale
[Termes IGN] analyse comparative
[Termes IGN] analyse diachronique
[Termes IGN] bilan hydrique
[Termes IGN] coordonnées GPS
[Termes IGN] données météorologiques
[Termes IGN] modèle météorologique
[Termes IGN] mousson
[Termes IGN] vapeur d'eau
[Termes IGN] variation saisonnièreRésumé : (Auteur) The vertically integrated water budget of West Africa is investigated with a hybrid dataset based on observational and modelling products elaborated by the African Monsoon Multidisciplinary Analyses (AMMA) and with several numerical weather prediction (NWP) products including the European Centre for Medium‐Range Weather Forecasts (ECMWF) AMMA reanalysis. Seasonal and intraseasonal variations are quantified over the period 2002–2007. Links between the budget terms are analyzed regionally, from the Guinean coast to the Sahel zone. Water budgets from the NWP systems are intercompared and evaluated against the hybrid dataset. Large deficiencies are evidenced in all the NWP products. Hypotheses are proposed about their origins and several improvements are foreseen. Copyright © 2010 Royal Meteorological Society. Numéro de notice : A2011-593 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/asl.288 Date de publication en ligne : 16/08/2010 En ligne : https://doi.org/10.1002/asl.288 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91516
in Atmospheric Science Letters > vol 12 n° 1 (January - March 2011) . - pp 51 - 57[article]The water vapour intercomparison effort in the framework of the Convective and Orographically-induced Precipitation Study: airborne-to-ground-based and airborne-to-airborne lidar systems / Rohini Bhawar in Quarterly Journal of the Royal Meteorological Society, vol 137 n° S1 (January 2011)
[article]
Titre : The water vapour intercomparison effort in the framework of the Convective and Orographically-induced Precipitation Study: airborne-to-ground-based and airborne-to-airborne lidar systems Type de document : Article/Communication Auteurs : Rohini Bhawar, Auteur ; Paolo Di Girolamo, Auteur ; Donato Summa, Auteur ; Cyrille Flamant, Auteur ; Dietrich Althausen, Auteur ; C. Kiemle, Auteur ; Pierre Bosser , Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 325 - 348 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] coordonnées GPS
[Termes IGN] données météorologiques
[Termes IGN] erreur systématique
[Termes IGN] estimation statistique
[Termes IGN] lidar atmosphérique
[Termes IGN] lidar Raman
[Termes IGN] précipitation
[Termes IGN] vapeur d'eauRésumé : (auteur) An intensive water vapour intercomparison effort, involving airborne and ground‐based water vapour lidar systems, was carried out in the framework of the COPS experiment. The main objective of this paper is to provide accurate error estimates for these systems. Comparisons between the ground‐based Raman lidar BASIL and the airborne CNRS DIAL (Differential Absorption Lidar) indicate a mean relative bias between the two sensors, calculated with respect to the mean value of −2.13% (−0.034 g kg−1) in the altitude region 0.5–3.5 km, while comparisons between BASIL and the airborne DLR DIAL lead to a mean relative bias of 1.87% (0.018 g kg−1) in this same altitude region. Comparisons between the ground‐based UHOH DIAL and the CNRS DIAL indicate a bias of −3.2% (−0.37 × 1022 m−3) in the altitude range 1.5–4.5 km, while comparisons between the UHOH DIAL and the DLR DIAL indicate a bias of 0.83% (0.06 × 1022 m−3) in this same altitude range. Based on the available comparisons between the ground‐based Raman lidar BERTHA and the CNRS DIAL, the mean relative bias is found to be −4.37% (−0.123 g kg−1) in the altitude region 0.5–4.5 km. Comparisons between the ground‐based IGN Raman lidar and the CNRS DIAL indicate a bias of 3.18% (0.55 g kg−1) in the altitude range from 0.5 to 4.5 km, while comparisons between the CNRS DIAL and DLR DIAL result in a mean relative bias of 3.93% (1.1 × 1022 m−3) in the altitude interval 0.5–4.0 km. Based on the available statistics of comparisons, benefiting from the fact that the CNRS DIAL was able to be compared with all other lidar systems, and putting equal weight on the data reliability of each instrument, overall relative values for BASIL, BERTHA, IGN Raman lidar, UHOH DIAL, DLR DIAL, and CNRS DIAL, with respect to the mean value, are found to be −0.38, −2.60, 4.90, −1.43, −2.23 and 1.72%, respectively. Numéro de notice : A2011-601 Affiliation des auteurs : LOEMI+Ext (1985-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1002/qj.697 Date de publication en ligne : 06/01/2011 En ligne : https://doi.org/10.1002/qj.697 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91674
in Quarterly Journal of the Royal Meteorological Society > vol 137 n° S1 (January 2011) . - pp 325 - 348[article]Refining DORIS atmospheric drag estimation in preparation of ITRF2008 / Marie-Line Gobinddass in Advances in space research, vol 46 n° 12 (15/12/2010)PermalinkPM10 remote sensing from geostationary SEVIRI and polar-orbiting MODIS sensors over the complex terrain of the European Alpine region / E. Emili in Remote sensing of environment, vol 114 n° 11 (15/11/2010)PermalinkAtmospheric correction to IRS-P6 AWiFS data and its validation with ground measurements: a study over the semi-arid region / Ashu Sharma in Geocarto international, vol 25 n° 7 (November 2010)PermalinkOn the importance of accurately ray-traced troposphere corrections for interferometric SAR data / T. Hobiger in Journal of geodesy, vol 84 n° 9 (September 2010)Permalinkvol 31 n° 17 - 18 - September 2010 - Pan ocean remote sensing : oceanic manifestation of global changes (Bulletin de International Journal of Remote Sensing IJRS) / G. LevyPermalinkSpectroscopic calibration correlation of field and lab-sized fluorescence LIDAR systems / B. Déry in IEEE Transactions on geoscience and remote sensing, vol 48 n° 9 (September 2010)PermalinkIonospheric response to the geomagnetic storm on august 21, 2003 over China using GNSS-based tomographic technique / D. Wen in IEEE Transactions on geoscience and remote sensing, vol 48 n° 8 (August 2010)PermalinkModélisation des retards troposphériques pour les observations GPS et impacts sur l'estimation de la hauteur ellipsoïdale / François Fund in XYZ, n° 123 (juin - août 2010)PermalinkAsymmetric tropospheric delays from numerical weather models for UT1 determination from VLBI Intensive sessions on the baseline Wettzell–Tsukuba / Johannes Böhm in Journal of geodesy, vol 84 n° 5 (May 2010)PermalinkGPS slant total electron content accuracy using the single layer model under different geomagnetic regions and ionospheric conditions / C. Brunini in Journal of geodesy, vol 84 n° 5 (May 2010)PermalinkA case study of using Raman lidar measurements in high-accuracy GPS applications / Pierre Bosser in Journal of geodesy, vol 84 n° 4 (April 2010)PermalinkWide-area RTK: high precision positioning on a continental scale / Manuel Hernández-Pajares in Inside GNSS, vol 5 n° 2 (March - April 2010)PermalinkImproving the GNSS positioning stochastic model in the presence of ionospheric scintillation / M. Aquino in Journal of geodesy, vol 83 n° 10 (October 2009)PermalinkAccuracy assessment of the GPS-based slant total electron content / C. Brunini in Journal of geodesy, vol 83 n° 8 (August 2009)PermalinkUsing NHDPlus as the land base for the Noah-distributed model / Christian David in Transactions in GIS, vol 13 n° 4 (August 2009)PermalinkRadiometric normalization of SPOT-5 scenes: 6S Atmospheric Model versus Pseudo-invariant Features / A. Davranche in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 6 (June 2009)PermalinkSynthetic aperture GPS signal processing: concept and feasibility demonstration / A. Soloviev in Inside GNSS, vol 4 n° 3 (May - June 2009)PermalinkAutomated urban land use and land classification for mesoscale atmospheric modeling over cities / André Leroux in Geomatica, vol 63 n° 1 (March 2009)PermalinkMonitoring storm-enhanced density using IGS reference station data / Anthea Coster in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)PermalinkTesting of Global Pressure-Temperature (GPT) Model and Global Mapping Function (GMF) in GPS analyses / Jan Kouba in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)Permalink