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Geographically and temporally neural network weighted regression for modeling spatiotemporal non-stationary relationships / Sensen Wu in International journal of geographical information science IJGIS, vol 35 n° 3 (March 2021)
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[article]
Titre : Geographically and temporally neural network weighted regression for modeling spatiotemporal non-stationary relationships Type de document : Article/Communication Auteurs : Sensen Wu, Auteur ; Zhongyi Wang, Auteur ; Zhenhong Du, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 582 - 608 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes descripteurs IGN] Chine
[Termes descripteurs IGN] classification par réseau neuronal
[Termes descripteurs IGN] espace-temps
[Termes descripteurs IGN] estimation par noyau
[Termes descripteurs IGN] littoral
[Termes descripteurs IGN] modélisation environnementale
[Termes descripteurs IGN] raisonnement spatiotemporel
[Termes descripteurs IGN] régression géographiquement pondérée
[Termes descripteurs IGN] régression linéaireRésumé : (auteur) Geographically weighted regression (GWR) and geographically and temporally weighted regression (GTWR) are classic methods for estimating non-stationary relationships. Although these methods have been widely used in geographical modeling and spatiotemporal analysis, they face challenges in adequately expressing space-time proximity and constructing a kernel with optimal weights. This probably results in an insufficient estimation of spatiotemporal non-stationarity. To address complex non-linear interactions between time and space, a spatiotemporal proximity neural network (STPNN) is proposed in this paper to accurately generate space-time distance. A geographically and temporally neural network weighted regression (GTNNWR) model that extends geographically neural network weighted regression (GNNWR) with the proposed STPNN is then developed to effectively model spatiotemporal non-stationary relationships. To examine its performance, we conducted two case studies of simulated datasets and environmental modeling in coastal areas of Zhejiang, China. The GTNNWR model was fully evaluated by comparing with ordinary linear regression (OLR), GWR, GNNWR, and GTWR models. The results demonstrated that GTNNWR not only achieved the best fitting and prediction performance but also exactly quantified spatiotemporal non-stationary relationships. Further, GTNNWR has the potential to handle complex spatiotemporal non-stationarity in various geographical processes and environmental phenomena. Numéro de notice : A2021-167 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2020.1775836 date de publication en ligne : 16/06/2020 En ligne : https://doi.org/10.1080/13658816.2020.1775836 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97102
in International journal of geographical information science IJGIS > vol 35 n° 3 (March 2021) . - pp 582 - 608[article]Spatio-temporal mobility and Twitter: 3D visualisation of mobility flows / Joaquín Osorio Arjona in Journal of maps, vol 16 n° 1 ([02/01/2020])
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Titre : Spatio-temporal mobility and Twitter: 3D visualisation of mobility flows Type de document : Article/Communication Auteurs : Joaquín Osorio Arjona, Auteur ; Juan Carlos García Palomares, Auteur Année de publication : 2020 Article en page(s) : pp 153 - 160 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] analyse spatio-temporelle
[Termes descripteurs IGN] base de données localisées
[Termes descripteurs IGN] données localisées des bénévoles
[Termes descripteurs IGN] espace-temps
[Termes descripteurs IGN] interface de programmation
[Termes descripteurs IGN] Madrid (Espagne)
[Termes descripteurs IGN] migration pendulaire
[Termes descripteurs IGN] mobilité urbaine
[Termes descripteurs IGN] réseau social
[Termes descripteurs IGN] système d'information géographique
[Termes descripteurs IGN] Time-geography
[Termes descripteurs IGN] Twitter
[Termes descripteurs IGN] visualisation 3D
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) Recent progress in computation and the spatio-temporal richness of data obtained from new sources have invigorated Time Geography. It is now possible to visualise and represent movements of people in a dual spatial–temporal dimension. In this work, we use geo-located data from the social media platform Twitter to show the value of new data sources for Time Geography. The methodology consists of visualising space–time paths in 2D and 3D in four study zones, with different land-use profiles, based on tweets compiled over the course of two years. The results provide a view of behaviours occurring in the areas of study throughout the day, with complementary data to show the population's main activity at different times. Numéro de notice : A2020-645 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/17445647.2020.1778549 date de publication en ligne : 18/06/2020 En ligne : https://doi.org/10.1080/17445647.2020.1778549 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96071
in Journal of maps > vol 16 n° 1 [02/01/2020] . - pp 153 - 160[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)
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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 descripteurs IGN] géophysique
[Termes descripteurs IGN] Lune
[Termes descripteurs IGN] paramètres d'orientation de la Terre
[Termes descripteurs IGN] principe d'équivalence
[Termes descripteurs IGN] relativité générale
[Termes descripteurs IGN] repère de référence
[Termes descripteurs IGN] rétroréflecteur
[Termes descripteurs IGN] sciences de la Terre et de l'univers
[Termes descripteurs IGN] signal laser
[Termes descripteurs IGN] télémétrie laser sur la LuneRésumé : (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
in Journal of geodesy > vol 93 n°11 (November 2019)[article]Space, time, and situational awareness in natural hazards: a case study of Hurricane Sandy with social media data / Zheye Wang in Cartography and Geographic Information Science, Vol 46 n° 4 (July 2019)
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Titre : Space, time, and situational awareness in natural hazards: a case study of Hurricane Sandy with social media data Type de document : Article/Communication Auteurs : Zheye Wang, Auteur ; Xinyue Ye, Auteur Année de publication : 2019 Article en page(s) : pp 334 - 346 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes descripteurs IGN] catastrophe naturelle
[Termes descripteurs IGN] données localisées des bénévoles
[Termes descripteurs IGN] espace-temps
[Termes descripteurs IGN] gestion de crise
[Termes descripteurs IGN] modèle de Markov
[Termes descripteurs IGN] modélisation 3D
[Termes descripteurs IGN] New York (Etats-Unis ; ville)
[Termes descripteurs IGN] outil d'aide à la décision
[Termes descripteurs IGN] réseau social
[Termes descripteurs IGN] risque naturel
[Termes descripteurs IGN] tempêteRésumé : (Auteur) Various methods have been developed to investigate the geospatial information, temporal component, and message content in disaster-related social media data to enrich human-centric information for situational awareness. However, few studies have simultaneously analyzed these three dimensions (i.e. space, time, and content). With an attempt to bring a space–time perspective into situational awareness, this study develops a novel approach to integrate space, time, and content dimensions in social media data and enable a space–time analysis of detailed social responses to a natural disaster. Using Markov transition probability matrix and location quotient, we analyzed the Hurricane Sandy tweets in New York City and explored how people’s conversational topics changed across space and over time. Our approach offers potential to facilitate efficient policy/decision-making and rapid response in mitigations of damages caused by natural disasters. Numéro de notice : A2019-201 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2018.1483740 date de publication en ligne : 18/06/2018 En ligne : https://doi.org/10.1080/15230406.2018.1483740 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92657
in Cartography and Geographic Information Science > Vol 46 n° 4 (July 2019) . - pp 334 - 346[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-2019041 SL Revue Centre de documentation Revues en salle Disponible Embedding road networks and travel time into distance metrics for urban modelling / Henry Crosby in International journal of geographical information science IJGIS, Vol 33 n° 3-4 (March - April 2019)
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Titre : Embedding road networks and travel time into distance metrics for urban modelling Type de document : Article/Communication Auteurs : Henry Crosby, Auteur ; theodore Damoulas, Auteur ; Stephen A. Jarvis, Auteur Année de publication : 2019 Article en page(s) : pp 512 - 536 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes descripteurs IGN] covariance
[Termes descripteurs IGN] distance euclidienne
[Termes descripteurs IGN] espace-temps
[Termes descripteurs IGN] géostatistique
[Termes descripteurs IGN] isométrie
[Termes descripteurs IGN] krigeage
[Termes descripteurs IGN] logement
[Termes descripteurs IGN] modèle de simulation
[Termes descripteurs IGN] réseau routier
[Termes descripteurs IGN] temps de trajet
[Termes descripteurs IGN] trafic routier
[Termes descripteurs IGN] urbanisme
[Termes descripteurs IGN] variogrammeRésumé : (auteur) Urban environments are restricted by various physical, regulatory and customary barriers such as buildings, one-way systems and pedestrian crossings. These features create challenges for predictive modelling in urban space, as most proximity-based models rely on Euclidean (straight line) distance metrics which, given restrictions within the urban landscape, do not fully capture spatial urban processes. Here, we argue that road distance and travel time provide effective alternatives, and we develop a new low-dimensional Euclidean distance metric based on these distances using an isomap approach. The purpose of this is to produce a valid covariance matrix for Kriging. Our primary methodological contribution is the derivation of two symmetric dissimilarity matrices (B+ and B2+), with which it is possible to compute low-dimensional Euclidean metrics for the production of a positive definite covariance matrix with commonly utilised kernels. This new method is implemented into a Kriging predictor to estimate house prices on 3,669 properties in Coventry, UK. We find that a metric estimating a combination of road distance and travel time, in both R2 and R3, produces a superior house price predictor compared with alternative state-of-the-art methods, that is, a standard Euclidean metric in RN and a non-restricted road distance metric in R2 and R3. F Numéro de notice : A2019-024 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2018.1547386 date de publication en ligne : 06/12/2018 En ligne : https://doi.org/10.1080/13658816.2018.1547386 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91952
in International journal of geographical information science IJGIS > Vol 33 n° 3-4 (March - April 2019) . - pp 512 - 536[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-2019032 RAB Revue Centre de documentation En réserve 3L Disponible 079-2019031 SL Revue Centre de documentation Revues en salle Disponible All-sky search for long-duration gravitational wave transients in the first Advanced LIGO observing run / B.P. Abbott in Classical and Quantum Gravity, vol 35 n° 6 (March 2018)
PermalinkHigh performance clocks and gravity field determination / Jurgen Müller in Space Science Reviews, vol 214 n° 1 (February 2018)
PermalinkMICROSCOPE mission: First results of a space test of the equivalence principle / Pierre Touboul in Physical Review Letters, vol 119 n° 3 (December 2017)
PermalinkModeling and manipulating spacetime objects in a true 4D model / Ken Arroyo Ohori in Journal of Spatial Information Science (JoSIS), n° 14 (March 2017)
PermalinkOn the usefulness of relativistic space-times for the description of the Earth’s gravitational field / Michael Soffel in Journal of geodesy, vol 90 n° 12 (December 2016)
PermalinkRigorous strip adjustment of UAV-based laserscanning data including time-dependent correction of trajectory errors / Philipp Glira in Photogrammetric Engineering & Remote Sensing, PERS, vol 82 n° 12 (December 2016)
PermalinkLes systèmes de navigation par satellite et la théorie de la Relativité Générale / Philippe Bourbon in Navigation aérienne, maritime, spatiale, terrestre, vol 63 n° 249 (janvier 2016)
PermalinkThe Minkowski approach for choosing the distance metric in geographically weighted regression / B. Lu in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)
PermalinkPermalinkPermalinkPermalinkThe time wave: a new method of visual exploration of geo-data in timespace / X. Li in Cartographic journal (the), vol 45 n° 3 (August 2008)
PermalinkExploring potential human activities in physical and virtual spaces: a spatio-temporal GIS approach / H. Yu in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkRepresentation and manipulation of moving points: an extended data model for location estimation / J. Moreira in Cartography and Geographic Information Science, vol 26 n° 2 (April 1999)
PermalinkSpatio-temporal interpolation and fuzzy logic for GIS simulation of rural-to-urban transition / Suzana Dragićević in Cartography and Geographic Information Science, vol 26 n° 2 (April 1999)
PermalinkVisualization of relationships between spatial patterns in time by cartographic animation / Connie Blok in Cartography and Geographic Information Science, vol 26 n° 2 (April 1999)
PermalinkPermalinkPermalinkPermalinkQuelques éléments en vue d'une approche relativiste du géoïde terrestre / Patrick Sillard (23/09/1996)
PermalinkPermalinkPermalinkPermalinkPermalinkGeographic Information Systems: materials for post-graduate course, 1. Spatial information / Andrew U. Frank (1995)
PermalinkGeographic Information Systems: Materials for a post-graduate course, 3. GIS organization / Andrew U. Frank (1995)
PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkThéorie de l'élasticité en relativité générale et application à la croûte solide des étoiles à neutrons / Denis Priou (1992)
PermalinkPermalinkPermalinkJournées 1990 Systèmes de référence spatio-temporels, Colloque André Danjon / Nicole Capitaine (1990)
PermalinkPermalinkPermalinkPermalinkRelating Nimbus-7 37GhZ data to global land-surface evaporation, primary productivity and the atmospheric C02 concentration / B.J. Choudhury in International Journal of Remote Sensing IJRS, vol 9 n° 1 (January 1988)
PermalinkUntersuchungen zur Elektrodynamik in relativistischen geodätischen Modellen / E. Stöcker-Meier (1988)
PermalinkSegmentation en régions selon des critères de mouvement dans une séquence d'images / Patrick Bouthemy (16/11/1987)
PermalinkPermalinkCours de physique, mathématiques supérieures, premier cycle universitaire, Tome 1. Mécanique / J. Boutigny (1984)
PermalinkPermalinkPermalinkPermalinkPermalinkAlbert Einstein 1879 - 1979 relativity, quanta, and cosmology: in the development of the scientific thought of Albert Einstein, 1. Volume 1 / M. Pantaleo (1979)
PermalinkAlbert Einstein 1879 - 1979 relativity, quanta, and cosmology: in the development of the scientific thought of Albert Einstein, 2. Volume 2 / M. Pantaleo (1979)
PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkFonctions numériques, certificat d'études supérieures de calcul différentiel et intégral / M. Choquet (1957)
PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalink