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A GIS-based stochastic approach to generating daytime population distributions for vehicle route planning / K. Lau in Transactions in GIS, vol 13 n°5-6 (October/december 2009)
[article]
Titre : A GIS-based stochastic approach to generating daytime population distributions for vehicle route planning Type de document : Article/Communication Auteurs : K. Lau, Auteur Année de publication : 2009 Article en page(s) : pp 481 - 502 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] itinéraire
[Termes IGN] Melbourne
[Termes IGN] milieu urbain
[Termes IGN] modèle stochastique
[Termes IGN] planification urbaine
[Termes IGN] répartition géographique
[Termes IGN] réseau routier
[Termes IGN] surveillance routière
[Termes IGN] transport routierRésumé : (Auteur) This article explores the use of daytime population distributions for vehicle route planning in urban environments when proximity to population is a major consideration. A GIS-based stochastic geocoding algorithm is proposed to generate daytime population distribution patterns using travel survey data. Metropolitan Melbourne in Australia is used as a test case with data collected from the Victorian Activity and Travel Survey between 1994 and 1999. The advantage of employing daytime population distributions for vehicle route planning is then illustrated taking dangerous goods delivery and mobile billboard advertising as examples. Analysis suggests that the proposed algorithm generates population distribution patterns with finer spatial and temporal details than that obtained using other estimation methods. The algorithm also eliminates the problem of over- or under-estimation of population associated with previous attempts using travel survey data and therefore provides more accurate results. Copyright Blackwell Publishing Numéro de notice : A2009-525 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01175.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01175.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30154
in Transactions in GIS > vol 13 n°5-6 (October/december 2009) . - pp 481 - 502[article]Improving the GNSS positioning stochastic model in the presence of ionospheric scintillation / M. Aquino in Journal of geodesy, vol 83 n° 10 (October 2009)
[article]
Titre : Improving the GNSS positioning stochastic model in the presence of ionospheric scintillation Type de document : Article/Communication Auteurs : M. Aquino, Auteur ; João F.G. Monico, Auteur ; A.H. Dodson, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 953 - 966 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] modèle stochastique
[Termes IGN] positionnement par GNSS
[Termes IGN] propagation ionosphérique
[Termes IGN] récepteur GNSS
[Termes IGN] scintillation
[Termes IGN] teneur totale en électronsRésumé : (Auteur) Ionospheric scintillations are caused by time- varying electron density irregularities in the ionosphere, occurring more often at equatorial and high latitudes. This paper focuses exclusively on experiments undertaken in Europe, at geographic latitudes between ~50°N and ~80°N, where a network of GPS receivers capable of monitoring Total Electron Content and ionospheric scintillation parameters was deployed. The widely used ionospheric scintillation indices S4 and {\sigma_{\varphi}} represent a practical measure of the intensity of amplitude and phase scintillation affecting GNSS receivers. However, they do not provide sufficient information regarding the actual tracking errors that degrade GNSS receiver performance. Suitable receiver tracking models, sensitive to ionospheric scintillation, allow the computation of the variance of the output error of the receiver PLL (Phase Locked Loop) and DLL (Delay Locked Loop), which expresses the quality of the range measurements used by the receiver to calculate user position. The ability of such models of incorporating phase and amplitude scintillation effects into the variance of these tracking errors underpins our proposed method of applying relative weights to measurements from different satellites. That gives the least squares stochastic model used for position computation a more realistic representation, vis-a-vis the otherwise ‘equal weights’ model. For pseudorange processing, relative weights were com- puted, so that a ‘scintillation-mitigated’ solution could be performed and compared to the (non-mitigated) ‘equal weights’ solution. An improvement between 17 and 38% in height accuracy was achieved when an epoch by epoch differential solution was computed over baselines ranging from 1 to 750 km. The method was then compared with alternative approaches that can be used to improve the least squares stochastic model such as weighting according to satellite elevation angle and by the inverse of the square of the standard deviation of the code/carrier divergence (sigma CCDiv). The influence of multipath effects on the proposed mitigation approach is also discussed. With the use of high rate scintillation data in addition to the scintillation indices a carrier phase based mitigated solution was also implemented and compared with the conventional solution. During a period of occurrence of high phase scintillation it was observed that problems related to ambiguity resolution can be reduced by the use of the proposed mitigated solution. Copyright Springer Numéro de notice : A2009-430 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0313-6 En ligne : https://doi.org/10.1007/s00190-009-0313-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30061
in Journal of geodesy > vol 83 n° 10 (October 2009) . - pp 953 - 966[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-09091 SL Revue Centre de documentation Revues en salle Disponible Application of a model to the evaluation of flood damage / Fabio Luino in Geoinformatica, vol 13 n° 3 (September 2009)
[article]
Titre : Application of a model to the evaluation of flood damage Type de document : Article/Communication Auteurs : Fabio Luino, Auteur ; G. Cirio, Auteur ; M. Biddoccu, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 339 - 353 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] dommage matériel
[Termes IGN] estimation statistique
[Termes IGN] inondation
[Termes IGN] Lombardie
[Termes IGN] modèle de simulation
[Termes IGN] simulation
[Termes IGN] système d'information géographiqueRésumé : (Auteur) This paper presents the initial results of a common methodology for the evaluation of damage produced by a flood. A model has been developed for flood damage estimation based on a geographic information system (GIS). It could be used by land administration bodies and insurance companies to manage flood-related damage data. The model simulates flood scenarios and evaluates expected economic losses from the impact of floodwaters on exposed elements, through the application of a computational model elaborated by GIS. During the development of the model, the Boesio Stream, a small watercourse flowing into Lake Maggiore (Lombardy, northern Italy) which was recently affected by a flash flood, was used as case study to test and calibrate the methodology. The method could be used either as a forecasting tool to define event scenarios, utilizing data from events simulated with a hydraulic model, or for real-time damage assessment after a disaster. The approach is suitable to large-area damage assessment and could be appropriate for land use planning, civil protection and risk mitigation. Copyright Springer Numéro de notice : A2009-256 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-008-0070-3 En ligne : https://doi.org/10.1007/s10707-008-0070-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29886
in Geoinformatica > vol 13 n° 3 (September 2009) . - pp 339 - 353[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-09031 RAB Revue Centre de documentation En réserve L003 Disponible Estimation du volume de bois exploitable en montagne par scanner laser aeoporté (Lidar) / Nicolas Clouet in Géomatique expert, n° 70 (01/09/2009)
[article]
Titre : Estimation du volume de bois exploitable en montagne par scanner laser aeoporté (Lidar) Type de document : Article/Communication Auteurs : Nicolas Clouet, Auteur ; Jean-Matthieu Monnet, Auteur ; Frédéric Berger, Auteur Année de publication : 2009 Article en page(s) : pp 32 - 37 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] bois
[Termes IGN] carte forestière
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] estimation statistique
[Termes IGN] forêt
[Termes IGN] montagne
[Termes IGN] outil d'aide à la décision
[Termes IGN] sylviculture
[Termes IGN] télémétrie laser aéroportéRésumé : (documentaliste) Cet article présente un moyen de cartographier les forêts exploitables dans des zones peu accessibles. Grâce aux traitements des données LIDAR, les différentes phases d'approches du terrain sont simplifiées. Numéro de notice : A2009-356 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29986
in Géomatique expert > n° 70 (01/09/2009) . - pp 32 - 37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 265-09051 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P000634 RAB Revue Nogent-sur-Vernisson En réserve L003 Exclu du prêt Airborne Lidar: in-flight accuracy estimation / Philipp Schaer in GPS world, vol 20 n° 8 (August 2009)
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Titre : Airborne Lidar: in-flight accuracy estimation Type de document : Article/Communication Auteurs : Philipp Schaer, Auteur ; Jan Skaloud, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 37 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] estimation statistique
[Termes IGN] précision du positionnement
[Termes IGN] qualité des données
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] traitement automatique de donnéesRésumé : (Auteur) This article describes new developments in an airborne mapping system described in the May 2006 issue, "AN EYE FOR LANDSCAPES: RAPID AERIAL MAPPING WITH HANDHELD SENSORS," by Jan Skaloud and co-authors. The portable system offers fast deployment with no recalibration and maps both vertical and horizontal features while maintaining optimal flight parameters. The geo-referenced image and 3D point-cloud data can be processed into digital terrain models, digital surface models, and automatically derived 3D city models. Copyright Questex Media Group Numéro de notice : A2009-308 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29938
in GPS world > vol 20 n° 8 (August 2009) . - pp 37 - 41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-09081 SL Revue Centre de documentation Revues en salle Disponible Use Markov random fields for automatic cloud-shadow detection on high resolution / Sylvie Le Hégarat-Mascle in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 4 (July - August 2009)PermalinkPermalinkAutomatic estimation of fine terrain models from multiple high-resolution satellite images / Nicolas Champion (2009)PermalinkA kernel density estimation method for networks, its computational method and a GIS-based tool / Atsuyuki Okabe in International journal of geographical information science IJGIS, vol 23 n° 1-2 (january 2009)PermalinkPrecise point positioning with GPS: A new approach for positioning, atmospheric studies, and signal analysis / Rodrigo Figueiredo Leandro (2009)PermalinkProblèmes inverses en imagerie et en vision, 1. Volume 1 / A. Mohammad-Djafari (2009)PermalinkProblèmes inverses en imagerie et en vision, 2. Volume 2 / A. Mohammad-Djafari (2009)PermalinkRemote sensing of soil salinization / G. Metternicht (2009)PermalinkSensitivity analysis of spatial models / Linda Lilburne in International journal of geographical information science IJGIS, vol 23 n° 1-2 (january 2009)PermalinkPermalink