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Discovering spatial patterns in origin-destination mobility data / D. Guo in Transactions in GIS, vol 16 n° 3 (June 2012)
[article]
Titre : Discovering spatial patterns in origin-destination mobility data Type de document : Article/Communication Auteurs : D. Guo, Auteur ; Hongxiao Jin, Auteur ; C. Andris, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 411 - 429 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse de groupement
[Termes IGN] analyse spatiale
[Termes IGN] base de données d'objets mobiles
[Termes IGN] cartographie des flux
[Termes IGN] distribution spatiale
[Termes IGN] données spatiotemporelles
[Termes IGN] Kouangtoung (Chine)
[Termes IGN] mobilité urbaine
[Termes IGN] modèle conceptuel de données spatio-temporelles
[Termes IGN] origine - destination
[Termes IGN] positionnement par GPS
[Termes IGN] trajectographie par GPS
[Termes IGN] transport urbain
[Termes IGN] véhicule automobileRésumé : (Auteur) Mobility and spatial interaction data have become increasingly available due to the wide adoption of location-aware technologies. Examples of mobility data include human daily activities, vehicle trajectories, and animal movements, among others. In this article, we focus on a special type of mobility data, i.e. origin-destination pairs, and present a new approach to the discovery and understanding of spatio-temporal patterns in the movements. Specifically, to extract information from complex connections among a large number of point locations, the approach involves two steps: (1) spatial clustering of massive GPS points to recognize potentially meaningful places; and (2) extraction and mapping of the flow measures of clusters to understand the spatial distribution and temporal trends of movements. We present a case study with a large dataset of taxi trajectories in Shenzhen, China to demonstrate and evaluate the methodology. The contribution of the research is two-fold. First, it presents a new methodology for detecting location patterns and spatial structures embedded in origin-destination movements. Second, the approach is scalable to large data sets and can summarize massive data to facilitate pattern extraction and understanding. Numéro de notice : A2012-282 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2012.01344.x Date de publication en ligne : 28/05/2012 En ligne : https://doi.org/10.1111/j.1467-9671.2012.01344.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31728
in Transactions in GIS > vol 16 n° 3 (June 2012) . - pp 411 - 429[article]
Titre : Remote sensing of planet earth Type de document : Monographie Auteurs : Yann Chemin, Éditeur scientifique Editeur : London [UK] : IntechOpen Année de publication : 2012 Importance : 252 p. Format : 18 x 26 cm ISBN/ISSN/EAN : 978-953-51-4940-8 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] classification dirigée
[Termes IGN] classification par maximum de vraisemblance
[Termes IGN] distribution spatiale
[Termes IGN] géomorphologie
[Termes IGN] image satellite
[Termes IGN] neige
[Termes IGN] occupation du sol
[Termes IGN] surveillance géologique
[Termes IGN] système d'information géographiqueRésumé : (éditeur) Monitoring of water and land objects enters a revolutionary age with the rise of ubiquitous remote sensing and public access. Earth monitoring satellites permit detailed, descriptive, quantitative, holistic, standardized, global evaluation of the state of the Earth skin in a manner that our actual Earthen civilization has never been able to before. The water monitoring topics covered in this book include the remote sensing of open water bodies, wetlands and small lakes, snow depth and underwater seagrass, along with a variety of remote sensing techniques, platforms, and sensors. The Earth monitoring topics include geomorphology, land cover in arid climate, and disaster assessment after a tsunami. Finally, advanced topics of remote sensing covers atmosphere analysis with GNSS signals, earthquake visual monitoring, and fundamental analyses of laser reflectometry in the atmosphere medium. Note de contenu : 1- On the Use of Airborne Imaging Spectroscopy Data for the Automatic Detection and Delineation of Surface Water Bodies
2- Remote Sensing for Mapping and Monitoring Wetlands and Small Lakes in Southeast Brazil
3- Satellite-Based Snow Cover Analysis and the Snow Water Equivalent Retrieval Perspective over China
4- Seagrass Distribution in China with Satellite Remote Sensing
5- The Use of Remote Sensed Data and GIS to Produce a Digital Geomorphological Map of a Test Area in Central Italy
6- Analysis of Land Cover Classification in Arid Environment: A Comparison Performance of Four Classifiers
7- Application of Remote Sensing for Tsunami Disaster
8- GNSS Signals: A Powerful Source for Atmosphere and Earth’s Surface Monitoring
9- Acceleration Visualization Marker Using Moiré Fringe for Remote Sensing
10- Looking at Remote Sensing the Timing of an Organisation's Point of View and the Anticipation of Today's ProblemsNuméro de notice : 25880 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Recueil / ouvrage collectif DOI : 10.5772/2291 En ligne : https://doi.org/10.5772/2291 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95735 Three-dimensional humidity retrieval using a network of compact microwave radiometers to correct for variations in wet tropospheric path delay in spaceborne interferometric SAR imagery / S. Sahoo in IEEE Transactions on geoscience and remote sensing, vol 49 n° 9 (September 2011)
[article]
Titre : Three-dimensional humidity retrieval using a network of compact microwave radiometers to correct for variations in wet tropospheric path delay in spaceborne interferometric SAR imagery Type de document : Article/Communication Auteurs : S. Sahoo, Auteur ; C. Reising, Auteur ; S. Padmanabhan, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 3281 - 3290 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] dégradation du signal
[Termes IGN] distribution spatiale
[Termes IGN] image radar moirée
[Termes IGN] image spatiale
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] propagation troposphérique
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] vapeur d'eau
[Termes IGN] variation temporelleRésumé : (Auteur) Spaceborne interferometric synthetic aperture radar (InSAR) imaging has been used for over a decade to monitor tectonic movements and landslides, as well as to improve digital elevation models. However, InSAR is affected by variations in round-trip propagation delay due to changes in ionospheric total electron content and in tropospheric humidity and temperature along the signal path. One of the largest sources of uncertainty in estimates of tropospheric path delay is the spatial and temporal variability of water vapor density, which currently limits the quality of InSAR products. This problem can be partially addressed by using a number of SAR interferograms from subsequent satellite overpasses to reduce the degradation in the images or by analyzing a long time series of interferometric phases from permanent scatterers. However, if there is a sudden deformation of the Earth's surface, the detection of which is one of the principal objectives of InSAR measurements over land, the effect of water vapor variations cannot be removed, reducing the quality of the interferometric products. In those cases, high-resolution information on the atmospheric water vapor content and its variation with time can be crucial to mitigate the effect of wet-tropospheric path delay variations. This paper describes the use of a ground-based microwave radiometer network to retrieve 3D water vapor density with fine spatial and temporal resolution, which can be used to reduce InSAR ambiguities due to changes in wet-tropospheric path delay. Retrieval results and comparisons between the integrated water vapor measured by the radiometer network and satellite data are presented. Numéro de notice : A2011-362 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2119400 Date de publication en ligne : 16/05/2011 En ligne : https://doi.org/10.1109/TGRS.2011.2119400 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31141
in IEEE Transactions on geoscience and remote sensing > vol 49 n° 9 (September 2011) . - pp 3281 - 3290[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2011091 RAB Revue Centre de documentation En réserve L003 Disponible 4D GPS water vapor tomography: new parameterized approaches / Donat Perler in Journal of geodesy, vol 85 n° 8 (August 2011)
[article]
Titre : 4D GPS water vapor tomography: new parameterized approaches Type de document : Article/Communication Auteurs : Donat Perler, Auteur ; Alain Geiger, Auteur ; Fabian Peter Hurter, Auteur Année de publication : 2011 Article en page(s) : pp 539 - 550 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Alpes
[Termes IGN] coordonnées ellipsoïdales
[Termes IGN] distribution spatiale
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] filtre de Kalman
[Termes IGN] prédiction
[Termes IGN] réfraction atmosphérique
[Termes IGN] réfringence
[Termes IGN] signal GPS
[Termes IGN] Suisse
[Termes IGN] tomographie
[Termes IGN] troposphère
[Termes IGN] vapeur d'eau
[Termes IGN] voxelRésumé : (Auteur) Water vapor is a key variable in numerical weather prediction, as it plays an important role in atmospheric processes. Nonetheless, the distribution of water vapor in the atmosphere is observed with a coarse resolution in time and space compared to the resolution of numerical weather models. GPS water vapor tomography is one of the promising methods to improve the resolution of water vapor measurements. This paper presents new parameterized approaches for the determination of water vapor distribution in the troposphere by GPS. We present the methods and give first results validating the approaches. The parameterization of voxels (volumetric pixels) by trilinear and spline functions in ellipsoidal coordinates are introduced in this study. The evolution in time of the refractivity field is modeled by a Kalman filter with a temporal resolution of 30s, which corresponds to the available GPS-data rate. The algorithms are tested with simulated and with real data from more than 40 permanent GPS receiver stations in Switzerland and adjoining regions covering alpine areas. The investigations show the potential of the new parameterized approaches to yield superior results compared to the non parametric classical one. The accuracy of the tomographic result is quantified by the inter-quartile range (IQR), which is decreased by 10–20% with the new approaches. Further, parameterized voxel solutions have a substantially smaller maximal error than the non parameterized ones. Simulations show a limited ability to resolve vertical structures above the top station of the network with GPS tomography. Numéro de notice : A2011-359 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0454-2 Date de publication en ligne : 08/03/2011 En ligne : https://doi.org/10.1007/s00190-011-0454-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31138
in Journal of geodesy > vol 85 n° 8 (August 2011) . - pp 539 - 550[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011081 RAB Revue Centre de documentation En réserve L003 Disponible Evaluation of analytical measures of map legibility / Hanna Stigmar in Cartographic journal (the), vol 48 n° 1 (February 2011)
[article]
Titre : Evaluation of analytical measures of map legibility Type de document : Article/Communication Auteurs : Hanna Stigmar, Auteur ; Lars Harrie, Auteur Année de publication : 2011 Article en page(s) : pp 41 - 53 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] distribution spatiale
[Termes IGN] lisibilité perceptive
[Termes IGN] objet cartographique
[Termes IGN] objet géographique complexe
[Termes IGN] service web géographique
[Termes IGN] temps réelRésumé : (Auteur) The generation of maps in real-time web-services introduces challenges concerning map legibility. As these services lack the important input of a traditional cartographer, analytical measures of the legibility are called for. The aim of this study was to develop such legibility measures, and to evaluate them with the help of expert users. Measures of the amount of information, spatial distribution and object complexity were developed and evaluated. The results indicated that some of the measures could be used to describe map legibility. Numéro de notice : A2011-259 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277410Y.0000000002 Date de publication en ligne : 22/11/2013 En ligne : https://doi.org/10.1179/1743277410Y.0000000002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31037
in Cartographic journal (the) > vol 48 n° 1 (February 2011) . - pp 41 - 53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 030-2011011 RAB Revue Centre de documentation En réserve L003 Disponible Crime analysis through spatial areal aggregated density patterns / P. Phillips in Geoinformatica, vol 15 n° 1 (January 2011)PermalinkOpenModeller : a generic approach to species’ potential distribution modelling / M. De Souza Munoz in Geoinformatica, vol 15 n° 1 (January 2011)PermalinkDetecting negative spatial autocorrelation in georeferenced random variables / Daniel A. Griffith in International journal of geographical information science IJGIS, vol 24 n°3-4 (march 2010)PermalinkOptimization of mobile radioactivity monitoring networks / Gerard B.M. Heuvelink in International journal of geographical information science IJGIS, vol 24 n°3-4 (march 2010)PermalinkGeospatial database organization and spatial decision analysis for biodiversity databases in web GIS environment / Harish Chandra Karnatak in Geocarto international, vol 25 n° 1 (February 2010)PermalinkComparison of GIS-based methodologies for the landslide susceptibility assessment / P. Magliulo in Geoinformatica, vol 13 n° 3 (September 2009)PermalinkApport des règles d'association spatiales pour l'alimentation automatique des bases de données géographiques / S.Y. Turki in Revue internationale de géomatique, vol 19 n° 1 (mars – mai 2009)PermalinkPermalinkIs the spatial distribution of European beech (Fagus sylvatica L.) limited by its potential height growth? / Ingrid Seynave in Journal of Biogeography, vol 35 n° 10 (October 2008)PermalinkSpatial analysis of urban flash flood survey results / M. Coulibaly in Geocarto international, vol 23 n° 3 (June - July 2008)Permalink