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Automatic detection of elevation changes by differential DSM analysis: application to urban areas / Cyrielle Guerin in IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol 7 n° 10 (October 2014)
[article]
Titre : Automatic detection of elevation changes by differential DSM analysis: application to urban areas Type de document : Article/Communication Auteurs : Cyrielle Guerin, Auteur ; Renaud Binet, Auteur ; Marc Pierrot-Deseilligny , Auteur Année de publication : 2014 Article en page(s) : pp 4020 - 4037 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] détection automatique
[Termes IGN] détection de changement
[Termes IGN] milieu urbain
[Termes IGN] modèle numérique de surface
[Termes IGN] qualité radiométrique (image)
[Termes IGN] zone urbaineRésumé : (auteur) Research in change detection from optical satellite data is widely investigated as a support for visual image analysis. Most of the methods, however, are based on radiometric changes and are suffering from high false alarms rate due to irrelevant radiometric changes. Change detection based on the elevation difference between two dates, therefore, seems a good alternative to identify relevant changes, especially in a context of urban change detection. In the present work, we provide a fully automatic method of change detection based on a digital surface model (DSM) comparison. The processing flow includes the bundle block adjustment of all the available data as a preprocessing step, followed by an improved DSM generation scheme and a differential DSM analysis. The last two steps have been formulated as labeling problems and solved by an optimization method with a spatial regularization constraint. The solution of these labeling problems is computed with a generalized dynamic programming algorithm that is adapted according to the input data and the defined labels. The final DSMs reach a planimetric and altimetric resolution of about 1 m, allowing changes from 20nbspm2 to be detected. The results show that 33%-75% (respectively about 95%) of all changes (respectively, changes larger than 100nbspm2) are detected, depending on the employed regularization and the area. Moreover, the calculated kappa coefficient of the processing flow reaches up to 0.80, which emphasizes the method accuracy. All the above features lead to a significant gain compared to the classical visual image analysis. Numéro de notice : A2013-811 Affiliation des auteurs : ENSG+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/JSTARS.2014.2300509 Date de publication en ligne : 31/01/2014 En ligne : https://doi.org/10.1109/JSTARS.2014.2300509 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80096
in IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing > vol 7 n° 10 (October 2014) . - pp 4020 - 4037[article]Time-geographic derivation of feasible co-presence opportunities from network-constrained episodic movement data / Mathias Versichele in Transactions in GIS, vol 18 n° 5 (October 2014)
[article]
Titre : Time-geographic derivation of feasible co-presence opportunities from network-constrained episodic movement data Type de document : Article/Communication Auteurs : Mathias Versichele, Auteur ; T. Neutens, Auteur ; Manuel Claeys Boùùaert, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 687 – 703 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse spatio-temporelle
[Termes IGN] Bluetooth
[Termes IGN] capteur passif
[Termes IGN] implémentation (informatique)
[Termes IGN] milieu urbain
[Termes IGN] objet mobile
[Termes IGN] réseau routierRésumé : (Auteur) Certain datasets on moving objects are episodic in nature – that is, the data is characterized by time gaps during which the position of the object is unknown. In this article, a model is developed to study the sparsely sampled network-constrained movement of several objects by calculating both potential and feasible (i.e. more likely) co-presence opportunities over time. The approach is applied to the context of a static sensor network, where the location of an object is only registered when passing a sensor location along a road network. Feasibility is incorporated based on the deviation from the shortest path. As an illustration, the model is applied to a large Bluetooth tracking dataset gathered at a mass event. The model output consists of maps showing the temporal evolution of the distribution of feasible co-presence opportunities of tracked visitors over the network (i.e. the number of visitors that could have been present together). We demonstrate the model's usefulness in studying the movement and distribution of a crowd over a study area with relatively few sampling locations. Finally, we discuss the results with a special emphasis on the distinction between feasible and actual presence, the need for further validation and calibration, and the performance of the implementation. Numéro de notice : A2014-510 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12050 Date de publication en ligne : 12/09/2013 En ligne : https://doi.org/10.1111/tgis.12050 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74109
in Transactions in GIS > vol 18 n° 5 (October 2014) . - pp 687 – 703[article]Towards a 3D spatial urban energy modelling approach / Jean-Marie Bahu in International journal of 3-D information modeling, vol 3 n° 3 (July- September 2014)
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Titre : Towards a 3D spatial urban energy modelling approach Type de document : Article/Communication Auteurs : Jean-Marie Bahu, Auteur ; Andreas Koch, Auteur ; Enrique Kremers, Auteur ; Syed Monjur Murshed, Auteur Année de publication : 2014 Article en page(s) : pp 1 - 16 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse des besoins
[Termes IGN] chaleur
[Termes IGN] données localisées 3D
[Termes IGN] énergie
[Termes IGN] fuite thermique
[Termes IGN] milieu urbain
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] modèle orienté agentRésumé : (auteur) Today's needs to reduce the environmental impact of energy use impose dramatic changes for energy infrastructure and existing demand patterns (e.g. buildings) corresponding to their specific context. In addition, future energy systems are expected to integrate a considerable share of fluctuating power sources and equally a high share of distributed generation of electricity. Energy system models capable of describing such future systems and allowing the simulation of the impact of these developments thus require a spatial representation in order to reflect the local context and the boundary conditions. This paper describes two recent research approaches developed at EIFER in the fields of (a) geo-localised simulation of heat energy demand in cities based on 3D morphological data and (b) spatially explicit Agent-Based Models (ABM) for the simulation of smart grids. 3D city models were used to assess solar potential and heat energy demand of residential buildings which enable cities to target the building refurbishment potentials. Distributed energy systems require innovative modelling techniques where individual components are represented and can interact. With this approach, several smart grid demonstrators were simulated, where heterogeneous models are spatially represented. Coupling 3D geodata with energy system ABMs holds different advantages for both approaches. On one hand, energy system models can be enhanced with high resolution data from 3D city models and their semantic relations. Furthermore, they allow for spatial analysis and visualisation of the results, with emphasis on spatially and structurally correlations among the different layers (e.g. infrastructure, buildings, administrative zones) to provide an integrated approach. On the other hand, 3D models can benefit from more detailed system description of energy infrastructure, representing dynamic phenomena and high resolution models for energy use at component level. The proposed modelling strategies conceptually and practically integrate urban spatial and energy planning approaches. The combined modelling approach that will be developed based on the described sectorial models holds the potential to represent hybrid energy systems coupling distributed generation of electricity with thermal conversion systems. Numéro de notice : A2014-691 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.4018/ij3dim.2014070101 En ligne : https://doi.org/10.4018/ij3dim.2014070101 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75327
in International journal of 3-D information modeling > vol 3 n° 3 (July- September 2014) . - pp 1 - 16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 138-2014031 RAB Revue Centre de documentation En réserve L003 Disponible Urban-Tree-Attribute update using multisource single-tree inventory / Ninni Saarinen in Forests, vol 5 n° 5 (May 2014)
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Titre : Urban-Tree-Attribute update using multisource single-tree inventory Type de document : Article/Communication Auteurs : Ninni Saarinen, Auteur ; Mikko Vastaranta, Auteur ; Ville Kankare, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 1032 - 1052 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] arbre (flore)
[Termes IGN] arbre urbain
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] hauteur des arbres
[Termes IGN] Helsinki
[Termes IGN] houppier
[Termes IGN] milieu urbainRésumé : (auteur) The requirements for up-to-date tree data in city parks and forests are increasing, and an important question is how to keep the digital databases current for various applications. Traditional map-updating procedures, such as visual interpretation of digital aerial images or field measurements using tachymeters, are either inaccurate or expensive. Recently, the development of laser-scanning technology has opened new opportunities for tree mapping and attributes updating. For a detailed measurement and attributes update of urban trees, we tested the use of a multisource single-tree inventory (MS-STI) for heterogeneous urban forest conditions. MS-STI requires an existing tree map as input information in addition to airborne laser-scanning (ALS) data. In our study, the tested input tree map was produced by terrestrial laser scanning (TLS) and by using a Global Navigation Satellite System (GNSS). Tree attributes were either measured from ALS or predicted by using metrics extracted from ALS data. Stem diameter-at-breast height (DBH) was predicted and compared to the field measures, and tree height and crown area were directly measured from ALS data at the two different urban-forest areas. The results indicate that MS-STI can be used for updating urban-forest attributes. The accuracies of DBH estimations were improved compared to the existing attribute information in the city of Helsinki’s urban-tree register. In addition, important attributes, such as tree height and crown dimensions, were extracted from ALS and added as attributes to the urban-tree register. Numéro de notice : A2014-761 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.3390/f5051032 En ligne : https://doi.org/10.3390/f5051032 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76419
in Forests > vol 5 n° 5 (May 2014) . - pp 1032 - 1052[article]The Bulger case : A spatial story / Les Roberts in Cartographic journal (the), vol 51 n° 2 (May 2014)
[article]
Titre : The Bulger case : A spatial story Type de document : Article/Communication Auteurs : Les Roberts, Auteur Année de publication : 2014 Article en page(s) : pp 141 - 151 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique
[Termes IGN] cartographie sensible
[Termes IGN] espace géographique
[Termes IGN] image vidéo
[Termes IGN] itinéraire
[Termes IGN] milieu urbain
[Termes IGN] processus cartographique
[Termes IGN] récit
[Termes IGN] réseau social
[Termes IGN] signalisation routière
[Termes IGN] signalisation touristique
[Termes IGN] vidéo numériqueRésumé : (Auteur) This paper contributes to debates in the emerging field of cinematic cartography (Caquard and Taylor, 2009) by exploring the ways in which strategies of digital cinemapping can function as tools of critical spatial practice and urban wayfinding. More specifically, the paper considers the scope for digital video technologies to reshape, contest and ‘ground’ spaces of urban representation and the ‘spatial stories’ these bring into play. Basing my analysis on the mediation of the events surrounding the abduction and murder of the 2-year-old boy James Bulger in 1993, I examine the case as a constellation of spatial narratives within which I weave my own spatial story in the form of a video mapping of the abduction route (in Bootle near Liverpool) and the responses and issues this further mediation has provoked. Methodological reflections on the map-making process are discussed alongside narratives generated by the video on YouTube. The paper argues that, by adopting practices of wayfinding, and by being critically attentive to the ways in which film and video-making practices are also spatial practices, moving image cartographies can provide insights into lived and embedded spaces of memory, and the hidden or muted spatial stories to which they play host. Numéro de notice : A2014-239 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277413Y.0000000075 En ligne : https://doi.org/10.1179/1743277413Y.0000000075 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33142
in Cartographic journal (the) > vol 51 n° 2 (May 2014) . - pp 141 - 151[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 030-2014021 RAB Revue Centre de documentation En réserve L003 Disponible Effects of green space spatial pattern on land surface temperature: Implications for sustainable urban planning and climate change adaptation / Matthew Maimaitiyiming in ISPRS Journal of photogrammetry and remote sensing, vol 89 (March 2014)PermalinkGeneration of true ortho-images based on virtual worlds: Learning aspects / Eduardo J. Piatti in Photogrammetric record, vol 29 n° 145 (March - May 2014)PermalinkMultiple-entity based classification of airborne laser scanning data in urban areas / S. Xu in ISPRS Journal of photogrammetry and remote sensing, vol 88 (February 2014)PermalinkAnalyse cartographique de l'évolution de la vulnérabilité en zone urbaine face aux inondations dites remarquables / Benjamin Daniere (2014)PermalinkAnalyse sémantique de nuages de points 3D dans le milieu urbain : sol, façades, objets urbains et accessibilité / Andres Felipe Serna Morales (2014)PermalinkBathymétrie en l’absence de signal GPS : application aux canaux urbains et aux tunnels canaux / Bastien Champier (2014)PermalinkContextual classification of lidar data and building object detection in urban areas / Joachim Niemeyer in ISPRS Journal of photogrammetry and remote sensing, vol 87 (January 2014)PermalinkGreen is the new grey / Mary Jo Wagner in GEO: Geoconnexion international, vol 13 n° 1 (january 2014)PermalinkMaximum-likelihood estimation for multi-aspect multi-baseline SAR interferometry of urban areas / Michael Schmitt in ISPRS Journal of photogrammetry and remote sensing, vol 87 (January 2014)PermalinkAutomatic segmentation of urban point clouds based on the gaussian map / Yinghui Wang in Photogrammetric record, vol 28 n° 144 (December 2013 - February 2014)Permalink