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Novel communication channel model for signal propagation and loss through layered earth / David O. LeVan in IEEE Transactions on geoscience and remote sensing, vol 58 n° 8 (August 2020)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 58 n° 8 (August 2020) . - pp 5393 - 5399 Titre : Novel communication channel model for signal propagation and loss through layered earth Type de document : Article/Communication Auteurs : David O. LeVan, Auteur Année de publication : 2020 Article en page(s) : pp 5393 - 5399 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] atténuation du signal [Termes IGN] champ électromagnétique [Termes IGN] cible cachée [Termes IGN] géophysique [Termes IGN] mine de charbon [Termes IGN] modèle de simulation [Termes IGN] modèle mathématique [Termes IGN] modélisation [Termes IGN] propagation du signal [Termes IGN] Terre (planète) Résumé : (auteur) Signal propagation through-the-Earth (TTE) is of great importance to geophysicists searching for underground resources such as oil and gas, homeland defense searching for tunnels and underground structures, and mining operations. The Earth is a conductive medium, unlike air or space, which tends to “short-out” electromagnetic fields traditionally used for wireless communications. The magnitude of this effect depends on many factors, such as frequency and the type of Earth-material. Mathematical models of energy propagation have been developed to help us understand the signal propagation issues, and some models can be used to predict the performance of the specific electromagnetic energies being used. There are numerous ways of modeling the Earth to study energy propagation. Some early literature presented models of signal propagation through a homogeneous Earth. These were fairly accurate for signals traveling from one point in the Earth to another point. However, signals traveling from below the ground to the surface of the Earth encounter many different layers of the Earth. This realization led to the development of models of a layered Earth. A novel layered-Earth communication model is presented and evaluated as to its accuracy by using measured data gathered during TTE communication tests from 2007 to 2012. Evaluations show that the new layered-EARTH model provides improved accuracy for the prediction of signal propagation performance from within a subterranean space, such as a mine, to and from the surface of the Earth. Numéro de notice : A2020-472 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2020.2965398 Date de publication en ligne : 28/01/2020 En ligne : https://doi.org/10.1109/TGRS.2020.2965398 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95575 [article]

Lunar Laser Ranging: a tool for general relativity, lunar geophysics and Earth science / Jurgen Müller in Journal of geodesy, vol 93 n°11 (November 2019)  

Public [article]  inJournal of geodesy > vol 93 n°11 (November 2019) Titre : Lunar Laser Ranging: a tool for general relativity, lunar geophysics and Earth science Type de document : Article/Communication Auteurs : Jurgen Müller, Auteur ; Thomas W. Murphy Jr, Auteur ; Ulrich Schreiber, Auteur ; et al., Auteur Année de publication : 2019 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Vedettes matières IGN] Géodésie spatiale [Termes IGN] géophysique [Termes IGN] Lune [Termes IGN] paramètres d'orientation de la Terre [Termes IGN] principe d'équivalence [Termes IGN] relativité générale [Termes IGN] repère de référence [Termes IGN] rétroréflecteur [Termes IGN] sciences de la Terre et de l'univers [Termes IGN] signal laser [Termes IGN] télémétrie laser sur la Lune Résumé : (auteur) Only a few sites on Earth are technically equipped to carry out Lunar Laser Ranging (LLR) to retroreflector arrays on the surface of the Moon. Despite the weak signal, they have successfully provided LLR range data for about 49 years, generating about 26,000 normal points. Recent system upgrades and new observatories have made millimeter-level range accuracy achievable. Based on appropriate modeling and sophisticated data analysis, LLR is able to determine many parameters associated with Earth–Moon dynamics, involving the lunar ephemeris, lunar physics, the Moon’s interior, reference frames and Earth orientation parameters. LLR has also become one of the strongest tools for testing Einstein’s theory of general relativity in the solar system. By extending the standard solution, it is possible to solve for parameters related to gravitational physics, like the temporal variation of the gravitational constant, metric parameters as well as the strong equivalence principle, preferred-frame effects and standard-model extensions. This paper provides a review about LLR measurement and analysis. After a short historical overview, we describe the key findings of LLR, the apparatus and technologies involved, the requisite modeling techniques, some recent results and future prospects on all fronts. We expect continued improvements in LLR, maintaining its lead in contributing to science. Numéro de notice : A2019-611 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-019-01296-0 Date de publication en ligne : 17/09/2019 En ligne : https://doi.org/10.1007/s00190-019-01296-0 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94799 [article]

Advanced Remote Sensing Technology for Synthetic Aperture Radar Applications, Tsunami Disasters, and Infrastructure / Maged Marghany (2019)  

Public Titre : Advanced Remote Sensing Technology for Synthetic Aperture Radar Applications, Tsunami Disasters, and Infrastructure Type de document : Monographie Auteurs : Maged Marghany, Éditeur scientifique Editeur : Rijeka [Croatie] : InTech Année de publication : 2019 ISBN/ISSN/EAN : 978-1-78985-618-7 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] apprentissage profond [Termes IGN] cartographie des risques [Termes IGN] classification par réseau neuronal convolutif [Termes IGN] géologie [Termes IGN] géophysique [Termes IGN] image 3D [Termes IGN] image captée par drone [Termes IGN] image radar moirée [Termes IGN] image satellite [Termes IGN] interférométrie [Termes IGN] surveillance du littoral [Termes IGN] tsunami Résumé : (éditeur) The advance in space machineries has created a novel technology for observing and monitoring the Earth from space. Most earth observation remote sensing considerations focus on using conventional image processing algorithms or classic edge detection tools. Nevertheless, these techniques do not implement modern physics, applied mathematics, signal communication, remote sensing data, and innovative space technologies. This book provides readers with methods to comprehend how to monitor coastal environments, disaster areas, and infrastructure from space with advanced talent remote sensing technology to bridge the gaps between modern space technology, image processing algorithms, mathematical models and the critical issue of the coastal and infrastructure investigations. Note de contenu : 1- Advanced Ocean Current Simulation from TanDEM Satellite Data 2- On Feature-Based SAR Image Registration: Appropriate Feature and Retrieval Algorithm 3- L-Band SAR Disaster Monitoring for Harbor Facilities Using Interferometric Analysis 4- Utilization of Deep Convolutional Neural Networks for Remote Sensing Scenes Classification 5- Sub-Pixel Technique for Time Series Analysis of Shoreline Changes Based on Multispectral Satellite Imagery 6- Utilization of Dynamic and Static Sensors for Monitoring Infrastructures 7- Geo Spatial Analysis for Tsunami Risk Mapping 8- Utilization of Unmanned Aerial Vehicle for Accurate 3D Imaging Numéro de notice : 25814 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie DOI : 10.5772/intechopen.78525 En ligne : https://www.intechopen.com/books/advanced-remote-sensing-technology-for-syntheti [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95077

Recursive orthogonal projection-based simplex growing algorithm / Hsiao-Chi Li in IEEE Transactions on geoscience and remote sensing, vol 54 n° 7 (July 2016)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 54 n° 7 (July 2016) . - pp 3780 - 3793 Titre : Recursive orthogonal projection-based simplex growing algorithm Type de document : Article/Communication Auteurs : Hsiao-Chi Li, Auteur ; Chein-I Chang, Auteur Année de publication : 2016 Article en page(s) : pp 3780 - 3793 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] algorithme du simplexe [Termes IGN] filtre de Kalman [Termes IGN] géophysique [Termes IGN] image hyperspectrale [Termes IGN] projection orthogonale Résumé : (Auteur) The simplex growing algorithm (SGA) has been widely used for finding endmembers. It can be considered as a sequential version of the well-known endmember finding algorithm, N-finder algorithm (N-FINDR), which finds endmembers one at a time by growing simplexes. However, one of the major hurdles for N-FINDR and SGA is the calculation of simplex volume (SV) which poses a great challenge in designing any algorithm using SV as a criterion for finding endmembers. This paper develops an orthogonal projection (OP)-based SGA (OP-SGA) which essentially resolves this computational issue. It converts the issue of calculating SV to calculating the OP on previously found simplexes without computing matrix determinants. Most importantly, a recursive Kalman filter-like OP-SGA, to be called recursive OP-SGA (ROP-SGA), can be also derived to ease computation. By virtue of ROP-SGA, several advantages and benefits in computational savings and hardware implementation can be gained for which N-FINDR and SGA do not have. Numéro de notice : A2016-871 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2016.2527737 En ligne : http://dx.doi.org/10.1109/TGRS.2016.2527737 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83028 [article]

Rapport Quadriennal 2011-2015 [du] CNFGG [à la] 26e assemblée générale de l'Union Géodésique et Géophysique Internationale / Pierre Hubert (2015)    

Public Titre : Rapport Quadriennal 2011-2015 [du] CNFGG [à la] 26e assemblée générale de l'Union Géodésique et Géophysique Internationale Type de document : Rapport Auteurs : Pierre Hubert, Éditeur scientifique ; Comité national français de géodésie et géophysique , Auteur Editeur : Paris : Comité National Français de Géodésie et Géophysique CNFGG Année de publication : 2015 Conférence : IUGG 2015, 26e Assemblée générale de l’UGGI 22/06/2015 02/07/2015 Prague République tchèque Importance : 137 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Français (fre) Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie [Termes IGN] géodésie [Termes IGN] géomagnétisme [Termes IGN] géophysique [Termes IGN] géosciences [Termes IGN] hydrologie [Termes IGN] météorologie [Termes IGN] océanographie [Termes IGN] sismologie [Termes IGN] volcanologie Numéro de notice : 39396 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport d'activité DOI : sans En ligne : https://iag.dgfi.tum.de/fileadmin/IAG-docs/NationalReports2015/CNFGG_RapQuad_UGG [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102829

Documents numériques

en open access Rapport Quadriennal 2011-2015 [du] CNFGG - pdf éditeur Adobe Acrobat PDF

The history of cartography, Volume 6 Part 1. Cartography in the twentieth century / Mark Monmonier (2015)

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Rapport Quadriennal 2007-2011 [du] CNFGG [à la] 25e assemblée générale de l'Union Géodésique et Géophysique Internationale / Jérôme Dyment (2011)    

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Rapport Quadriennal 2003-2006 [du] CNFGG [à la] 24e assemblée générale de l'Union Géodésique et Géophysique Internationale / D. Schertzer (2007)    

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Satellite Altimetry for geodesy, geophysics and oceanography / C. Hwang (2004)  

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Développement d'un outil d'évaluation du rapport d'atténuation des ondes PP et des ondes PS / D. Maillet (2003)

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AGRET 1999-2001, 3ème colloque AGRET / Patrick Sillard (2002)

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General meeting proceedings [of] International VLBI Service for Geodesy and Astrometry / N.R. Vandenberg (2002)

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International Laser Ranging Service (ILRS) 2001 annual report / Michael Pearlman (2002)

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International Laser Ranging Service (ILRS) 2000 annual report / Michael Pearlman (2001)

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Dictionnaire des sciences de la terre français-anglais, anglais-français / M. Moureau (2000)

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