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Deploying a Locata network to enable precise positioning in urban canyons / J.P. Montillet in Journal of geodesy, vol 83 n° 2 (February 2009)
[article]
Titre : Deploying a Locata network to enable precise positioning in urban canyons Type de document : Article/Communication Auteurs : J.P. Montillet, Auteur ; Gethin W. Roberts, Auteur ; Craig M. Hancock, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 91 - 103 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] canyon urbain
[Termes IGN] GPS en mode cinématique
[Termes IGN] milieu urbain
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] propagation du signal
[Termes IGN] WiFiRésumé : (Auteur) Locata is a new positioning technology developed by the Locata Corporation. At the beginning of 2007, the Institute of Engineering Surveying and Space Geodesy (IESSG) bought and received a network of Locata transceivers with two rovers. The purpose is to solve the challenges identified when surveying in dense multipath areas (i.e. urban canyons). In this paper, the technology is tested in an urban canyon scenario on the University park at the University of Nottingham. By comparing Locata position solutions with the true positions calculated with a total station and a carrier-phase GPS, the results show that centimetre-level accuracy is achievable in difficult environments in the presence of Wi-Fi signals. The rover’s estimated coordinates may diverge in some cases. Finally, a comparison study shows that Real Time Kinematic GPS and Locata technologies have similar accuracy when both are available. Copyright Springer Numéro de notice : A2009-188 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0236-7 En ligne : https://doi.org/10.1007/s00190-008-0236-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29818
in Journal of geodesy > vol 83 n° 2 (February 2009) . - pp 91 - 103[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-09021 SL Revue Centre de documentation Revues en salle Disponible Trop chaud là-haut ! / Françoise de Blomac in SIG la lettre, n° 104 (février 2009)
[article]
Titre : Trop chaud là-haut ! Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2009 Article en page(s) : pp 12 - 13 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] bâtiment
[Termes IGN] carte thématique
[Termes IGN] fuite thermique
[Termes IGN] image thermique
[Termes IGN] milieu urbain
[Termes IGN] orthothermoplan
[Termes IGN] photogrammétrie numérique
[Termes IGN] thermographie aérienne
[Termes IGN] villeRésumé : (Auteur) La thermographie aérienne permet d'effectuer un premier diagnostic des déperditions de chaleur par les toits à l'échelle d'une ville. ITC, I2G et Aerodata se sont associés pour proposer une offre industrialisée qui tire partie des techniques de la photogrammétrie. Grâce à cette union, ils remportent de beaux contrats. Copyright SIG La Lettre Numéro de notice : A2009-035 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29665
in SIG la lettre > n° 104 (février 2009) . - pp 12 - 13[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 286-09021 RAB Revue Centre de documentation En réserve L003 Disponible Autonomous integrity: an error isotropy-based approach for multiple fault conditions / M. Azaola-Saenz in Inside GNSS, Vol 4 n° 1 (January-Fabruary 2009)
[article]
Titre : Autonomous integrity: an error isotropy-based approach for multiple fault conditions Type de document : Article/Communication Auteurs : M. Azaola-Saenz, Auteur ; J. Cosmen-Schortmann, Auteur Année de publication : 2009 Article en page(s) : 9 p. ; pp 28 - 36 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] intégrité des données
[Termes IGN] méthode des moindres carrés
[Termes IGN] milieu urbain
[Termes IGN] positionnement par GNSS
[Termes IGN] résidu
[Termes IGN] résolution d'ambiguïté
[Termes IGN] trajet multiple
[Termes IGN] validation des donnéesRésumé : (Editeur) Within the great effort being spent on improving GNSS integrity-assurances techniques in order to achieve higher service levels for civil aviation, special attention is being paid to user-based solutions, as reflected in the conclusions of the Federal Aviation Administration's GNSS Evolutionary Architecture Study (GEAS) panel. This article introduces an autonomous technique for computing protection levels based on error isotropy that, unlike conventional methods, adapts in real-time to ranging error size and also handles multiple-fault conditions. Copyright Inside GNSS Numéro de notice : A2009-548 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/1140 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33535
in Inside GNSS > Vol 4 n° 1 (January-Fabruary 2009) . - 9 p. ; pp 28 - 36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-09011 SL Revue Centre de documentation En réserve L003 Disponible Documents numériques
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Autonomous integrity ... - pdf éditeurAdobe Acrobat PDF Building footprint database improvement for 3D reconstruction : a direction aware split and merge approach / Bruno Vallet (2009)
contenu dans CMRT09 Object extraction for 3D city models, road databases and traffic monitoring-concepts, algorithms and evaluation / Uwe Stilla (2009)
Titre : Building footprint database improvement for 3D reconstruction : a direction aware split and merge approach Type de document : Article/Communication Auteurs : Bruno Vallet , Auteur ; Didier Boldo , Auteur ; Marc Pierrot-Deseilligny , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2009 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3-W4 Conférence : CMRT 2009, City Models, Roads and Traffic, Object extraction for 3D city models, road databases, traffic monitoring 03/09/2009 04/09/2009 Paris France OA ISPRS Archives Importance : pp 139 - 144 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] base de données localisées
[Termes IGN] empreinte
[Termes IGN] milieu urbain
[Termes IGN] précision du positionnement
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] segmentation d'imageRésumé : (Auteur) In the context of 3D reconstruction of wide urban areas, the use of building footprints has shown to be of great help to achieve both robustness and precision. These footprints however often present inconsistencies with the data (more than one building in the footprint, inner courts, superstructures...) This paper presents a fast and efficient algorithm to enhance the building footprint database in order to make subsequent 3D reconstructions easier, more accurate and more robust. It is based on a segmentation energy that is minimized by a split and merge approach. The algorithm is demonstrated on a wide urban area of one square kilometer. Numéro de notice : C2009-010 Affiliation des auteurs : MATIS (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVIII/3-W4/pub/CMRT09_139.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65050
Titre : Classification of roof materials for rainwater pollution modelization Type de document : Article/Communication Auteurs : Arnaud Le Bris , Auteur ; Pauline Robert-Sainte, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2009 Conférence : ISPRS 2009, High-Resolution Earth Imaging for Geospatial Information workshop 02/06/2009 05/06/2009 Hanovre Allemagne OA ISPRS Archives Importance : 6 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] BD Topo
[Termes IGN] classification dirigée
[Termes IGN] eau pluviale
[Termes IGN] image RVB
[Termes IGN] matériau
[Termes IGN] milieu urbain
[Termes IGN] ombre
[Termes IGN] orthoimage couleur
[Termes IGN] pollution des eaux
[Termes IGN] segmentation d'image
[Termes IGN] toitRésumé : (Auteur) It has been proven that roof runoff water plays an important role in the high metallic concentration levels in urban rainwater since metallic elements are generated by corrosion of roof materials before being swept away by rainwater. The aim of TOITEAU project is therefore to model this phenomenon, evaluating the metallic flows from roofs in rainwater. To achieve this goal, an important work has already been done to model those flows at roof scale. But, it has now to be extrapolated to a whole drainage area, requiring knowledge about the areas concerned by the different kinds of roof coverage, that is to say that a map of roof materials is needed. Such information can be extracted from aerial (ortho) images owing to (supervised) classification techniques. In the present situation, only six classes corresponding to the following kinds of roofs were defined : zinc plates, slates, red tiles, brown tiles and flat roofs. Nevertheless, classification results are limited because of several factors that have therefore to be dealt with. First of all, some distinct classes have very similar radiometric distribution (such as for instance zinc and at light slates), making it hard to distinguish between them. That's why derived channels computed from initial red-green-blue channels of the ortho-image have been used to improve the classification results. Texture channels have also been tested especially to discriminate zinc from other light coloured roof materials. For the same reason and in order not to obtain a too ”noisy” result, per region classification algorithms have been used : homogeneous regions will be classified instead of pixels. Secondly, roofs are the only interesting parts of the ortho-image in this study. As a consequence, a building mask is first computed from digital topographic database BDTopo in order to classify only roofs. However, several elements concerning data precision have to be taken into account at this step. For instance, the ortho-image and the topographic database can obviously not have been captured at the same date and, as a consequence, buildings can have been destroyed, modified or built between these two distinct capture times. In addition, as the used ortho-image is not a ”true ortho-image”, building objects from digital topographic database and ortho-image roofs are not perfectly superposed. However, these topographic database building objects can be registered to the ortho-image. Nevertheless, it must be said that these database objects often remain caricatures of true buildings. Besides, most of the time, homogeneous regions to be classified do not directly correspond to database buildings since those database objects can be groups of buildings or buildings of which the roof is composed of different materials. Therefore, it is necessary to segment building areas (according to the topographic database) of the ortho-image into homogeneous regions that are then classified. Lastly, shadows can be quite important in roof areas because of the presence of roof superstructures or higher buildings in the neighbourhood. That's why an additional class ”shadow” is also defined in order to take into account shadow areas where radiometric information is not sufficient to discriminate between the different kinds of materials. Tests have been carried out on two distinct study areas with 50cm resolution orthophotos for the first one and 12cm resolution orthoimages for the second one. The first study area was a dense urban centre, whereas the second could be divided into several parts : a residential suburb consisting of houses, a dense urban centre with buildings having up to 4-5 levels and a mixed residential / service area consisting of higher buildings. Numéro de notice : C2009-038 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVIII/1_4_7-W5/paper/LE_BRIS-152.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64298 Documents numériques
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Classification of roof materials ... - pdf éditeurAdobe Acrobat PDF Détection et caractérisation de la végétation en milieu urbain à partir d'images aériennes haute résolution / Corina Iovan (2009)PermalinkDéveloppement de méthodes et d'outils pour l'amélioration de la résilience urbaine face au risque d'inondation / Serge Lhomme (2009)PermalinkFull-waveform topographic lidar: State-of-the-art / Frédéric Bretar in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 1 (January - February 2009)PermalinkPermalinkPermalinkPermalinkTowntology, Urban ontologies for an improved communication in urban development project / Jacques Teller (2009)PermalinkApproche multi-risque en milieu urbain : application à l'agglomération de Mulhouse (Haut-Rhin) / Elise Beck in Le monde des cartes, n° 198 (décembre 2008)PermalinkA knowledge-based approach to urban feature classification using aerial imagery with Lidar data / M. Huang in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 12 (December 2008)PermalinkPrediction and visualization of GPS multipath signals in urban areas using LiDAR Digital Surface Models and building footprints / J. Li in International journal of geographical information science IJGIS, vol 22 n°11-12 (november 2008)PermalinkSubpixel urban land cover estimation: comparing cubist, random forests, and support vector regression / J. Walton in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 10 (October 2008)PermalinkApproches de classification évidentielle et paradoxale d'images satellitaires multispectrales pour l'amélioration de la carte d'occupation du sol : application au milieu urbain et périurbain de la région d'Alger / R. Khedam in Revue Française de Photogrammétrie et de Télédétection, n° 190 (Septembre 2008)PermalinkL'utilisation des SIG pour l'analyse des disparités spatiales de santé dans la ville de Vientiane (Laos) / J. Vallee in Le monde des cartes, n° 197 (septembre 2008)Permalink3D noise mapping in urban areas / Jantien E. Stoter in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)PermalinkCity walk: improving GPS accuracy for urban pedestrians / J. Prost in GPS world, vol 19 n° 8 (August 2008)PermalinkGeneralized network Voronoi diagrams: concepts, computational methods, and applications / Atsuyuki Okabe in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)PermalinkUsing neural networks and cellular automata for modelling intra-urban land-use dynamics / C.M. Almeida in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)PermalinkA method for monitoring building construction in urban sprawl areas using object-based analysis of Spot 5 images and existing GIS data / Laurent Durieux in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 4 (July - August 2008)PermalinkFrom 2D to 3D land parcelation: fusion of LiDAR data and cadastral maps / S. Filin in SaLIS Surveying and land information science, vol 68 n° 2 (June 2008)PermalinkGood-practice example of a German regional SDI as a component of the future INSPIRE framework / H. Mueller in SaLIS Surveying and land information science, vol 68 n° 2 (June 2008)Permalink