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Titre : Processus d'intégration et d'appariement de bases de données géographiques : Application à une base de données routières multi-échelles Type de document : Thèse/HDR Auteurs : Thomas Devogele , Auteur ; E. Simon, Directeur de thèse
Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 1997 Importance : 207 p. Format : 21 x 30 cm Note générale : Bibliographie
Thèse de doctorat de méthodes informatiquesLangues : Français (fre) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] appariement de données localisées
[Termes IGN] base de données localisées
[Termes IGN] base de données multi-représentation
[Termes IGN] conflit d'intégration
[Termes IGN] intégration de données
[Termes IGN] interopérabilité
[Termes IGN] représentation multiple
[Termes IGN] système d'information géographiqueIndex. décimale : THESE Thèses et HDR Numéro de notice : 11027 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Thèse française Note de thèse : Thèse de doctorat : méthodes informatiques : Versailles : 1997 Organisme de stage : COGIT (IGN) nature-HAL : Thèse DOI : sans En ligne : https://hal.science/tel-00085113 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45153 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 11027-01 THESE Livre Centre de documentation Thèses Disponible 11027-02 THESE Livre Centre de documentation Thèses Disponible 11027-04 K325 Livre LASTIG Dépôt en unité Exclu du prêt 11027-03 K325 Livre LASTIG Dépôt en unité Exclu du prêt
Titre : Road extraction based on snakes and sophisticated line extraction Type de document : Mémoire Auteurs : Ivan Laptev, Auteur Editeur : Stockholm : Royal Institute of Technology Année de publication : 1997 Importance : 67 p. Format : 21 x 30 cm Note générale : bibliography
Master of Science, Royal Institute of Technology, StockholmLangues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] algorithme snake
[Termes IGN] détection de contours
[Termes IGN] extraction du réseau routier
[Termes IGN] image aérienne
[Termes IGN] image satellite
[Termes IGN] reconnaissance de formes
[Termes IGN] réseau routier
[Termes IGN] saillanceRésumé : (auteur) The extraction of roads from aerial and satellite images is an important task within cartography and planning of new road networks. The automation of this task is highly motivated by the expected increase of the speed and the precision of extraction. This work considers automatic road extraction from single aerial images of high resolution. It is based on two previously developed approaches: The first one is the differential geometric approach for extraction of linear features; The second - contour extraction based on Active Contour Models, also called snakes. Whereas the first approach is fully-automatic, the second was previously mostly used for semi-automatic tasks which require the control of a human operator. This work combines both techniques and adapt them in the method for fully-automatic road extraction. According to the used strategy, the hypotheses for most salient roads in images of rural scenes are generated and verified first. Then, based on the ends of extracted roads the hypotheses for other roads are stated. The developed snake-based technique for the verification of these hypotheses enables recognition of partially occluded and shadowed roads as well as some roads passing through road crossings. The presented results of the developed approach show that the reliable extraction of roads which images are disturbed by surrounding objects is in many cases possible without the explicit knowledge about these objects. This is a big advantage since the automatic recognition of buildings, vegetation etc., is a very complicated problem by itself. Note de contenu : Introduction
1 - Survey of Related Work
2 - Objectives and Limitations
3 - Theory of Snakes
4 - Road Extraction Loop
5 - Matching of the Road Model
6 - Results
ConclusionNuméro de notice : 21689 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Mémoire DEA divers Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90926
Titre : Semantic aspects of interoperable GIS Type de document : Thèse/HDR Auteurs : Yaser Bishr, Auteur Editeur : Wageningen : Wageningen Agricultural University Année de publication : 1997 Autre Editeur : Enschede : International Institute for Aerospace Survey and Earth Sciences ITC Importance : 154 p. Format : 15 x 24 cm ISBN/ISSN/EAN : 978-90-6164-141-4 Note générale : bibliographie
thesis to fullfil the requirements for the degree of doctor on the authority of the rector magnificusLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] découverte de connaissances
[Termes IGN] données hétérogènes
[Termes IGN] information sémantique
[Termes IGN] interopérabilité
[Termes IGN] partage de données localisées
[Termes IGN] système d'information géographiqueRésumé : (auteur) An increasing number of geospatial applications require information which is scattered in several independent geographic information systems. One of the main objectives of geographic information infrastructure, GII, is to provide a political, institutional, economic, and technical platform to share information. The focus of this thesis is on the technical aspects of the GII. The thesis aims at providing a mechanism to share information seamlessly among distributed, heterogeneous, geospatial information systems. Sharing information may improve decision making and reduce the cost of data collection. In general, retrieving information from distributed databases involves two steps. In the first step users search for relevant information resources in a network of information providers. In the second step users request data from the information resource. With regard to the first step, a model to search for the relevant information resources is presented. The model is called the resource discovery model, RDM. It provides a reference model to structure the metadata of the information resources in a tree of interrelated resources. In the second step, interoperability allows communication among heterogeneous, distributed, information systems. Interoperability is the ability of two or more systems to exchange geospatial information and to make mutual use of the information that has been exchanged. The research identifies two perspectives to interoperability; these are the data modeling perspective and the system architecture perspective. In relation to data modeling, three types of heterogeneity arise: syntactic, schematic, and semantic. The semantic heterogeneity occurs due to differences in the definition of classes, the definition of class intension and the geometric description. This set of definitions is called context information. The semantic heterogeneity is the main factor for the schematic and the syntactic heterogeneity. The schematic heterogeneity pertains to the differences in the class hierarchies and the attribute structure of database schemas. The syntactic heterogeneity occurs due to the differences in the constructs used to model relationships among classes and attributes, object geometry, and topologic relationships. To provide interoperability among different GIS applications, it is necessary to resolve the semantic, schematic, and syntactic heterogeneity. In this thesis, a model for information sharing is presented. The model is called the semantic formal data structure, SFDS. It consists of three layers, in which each layer is intended to resolve a specific type of heterogeneity. The model provides a method for loading semantics that is the context information, into database schemas. The first layer of SFDS is the syntactic layer, in which the formal data structure, FDS, is adopted. The second layer of SFDS is the schematic layer, in which the concept of federated databases is adopted. A reference model for the federated schemas is presented. The implementation of SFDS and RDM is related to the system architecture perspective for interoperability, and is discussed in this thesis. A comparison of the implementation of RDM, which is a clearinghouse, with other implementations has proven that a consistent abstract model is required to maintain and ensure the consistency of the contents of the clearinghouse as well as to improve the results of the search for information resources. The three-layers approach adopted in SFDS has proven adequate to resolve the three types of heterogeneity. The implementation of SFDS, known as the semantic translator, has shown that it should be dedicated to a single application domain, to simplify its practical implementation and maintenance. In this case databases can have several semantic translators installed, each being specific to an application domain. For example, one database may have a semantic translator to exchange road network information, another to exchange soil information, etc. Note de contenu : 1. Framework and Objectives
2. Environmental decision making - a GeoInformation perspective
3. Interoperability of GIS
4. Abstraction and heterogeneity among contexts
5. The reference model of SFDS
6. The role of semantics in mapping between database schemas
7. The resource discovery model
8. Implementation of SemWeb
9. Conclusions and recommendationsNuméro de notice : 19825 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Thèse étrangère Note de thèse : PhD : Geomatics : Wageningue : 1997 Organisme de stage : International Institute for Aerospace Survey and Earth Sciences (ITC) En ligne : https://edepot.wur.nl/211778 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85898 Exemplaires(1)
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Titre : Semi-automatic road extraction from satellite and aerial images Type de document : Thèse/HDR Auteurs : Li, Auteur Editeur : Zurich : Institut für Geodäsie und Photogrammetrie IGP - ETH Année de publication : 1997 Collection : IGP Mitteilungen, ISSN 0252-9335 num. 061 Importance : 164 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-906513-96-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] extraction semi-automatique
[Termes IGN] fonction spline
[Termes IGN] image satellite
[Termes IGN] photographie aérienne
[Termes IGN] réseau routier
[Termes IGN] traitement d'imageIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (auteur) Of all parts in the process of GIS data generation from satellite and aerial images, the actual mapping phase is one of the most time consuming and expensive procedure. Research is therefore increasingly focusing on the development of efficient methods to automatically extract man-made objects like houses and roads from digital images. As fully automatic methods for mapping are still far out of reach, semi-automatic methods for feature extraction that interact with a human operator are considered to be a good compromise, combining the mensuration speed and accuracy of a computer algorithm with the interpretation skills of a human operator. This dissertation deals with semi-automatic linear feature extraction from digital images for GIS data capture, where the identification task is performed manually on a single image, while a special automatic digital module performs the high precision line tracking. More specifically, a human operator is used to identify the object from an on-screen display of a digital image, selects the particular class this object belongs to and provides some very few seed points coarsely distributed. This is done through activation of a mouse in a convenient interactive graphics-image user interface. Subsequently, with these seed points as an approximation of the position and shape, the linear feature will be extracted precisely and automatically by either a dynamic programming approach or LSB-Snakes. These techniques can be used in a monoplotting mode, which combines one image with its underlying DTM. The LSB-Snakes approach is also implemented in a multi-image mode, which uses multiple images simultaneously and provides for a robust and mathematically sound full 3-D approach. Firstly, we propose a semi-automatic road extraction scheme which combines the wavelet decomposition for road sharpening and a model driven linear feature extraction algorithm based on dynamic programming. With a wavelet transform interesting image structures can be enhanced and a multiresolution representation can be obtained by selection of a special wavelet. We have built a particular wavelet for road sharpening, which has been implemented as a fast pyramidal algorithm. In the model driven feature extraction scheme, a road is represented by a generic road model with six photometric and geometric properties. This model is formulated by some constraints and a merit function which embodies a notion of the "best road segment", and evaluated by a "time-delayed" dynamic programming algorithm. In order to reduce the computational complexity, a strategy of dynamic vertex insertion and deletion is developed. In such a way, even a long road segment can be handled efficiently. The mathematical foundation and issues relating to its practical implementation are discussed in detail. This approach has been applied very successfully to extract complete road structures from single SPOT scenes and small scale aerial images. Experimental results show that the algorithm is very robust in case of gaps and other distortions because of use of global photometric information and geometric constraints. Then, a general approach for linear feature extraction with active contour models is investigated. In general, the Snakes or active contour models feature extraction algorithm integrates both photometric and geometric constraints, with an initial estimate of the location of the feature, by an integral measure referred to as the total energy of Snakes. The local minimum in this energy defines the feature of interest. In this dissertation, active contour models are approximated by B-spline curves and formulated in terms of a combined least squares adjustment. The observation equations consist of the equations formulating the matching of a generic object model and image data, and those that express the geometric constraints and operator-given seed points. We call this novel concept of Snakes "LSB-Snakes" (Least Squares B-spline Snakes). LSB-Snakes considerably improve active contour models by using three new elements: (i) the possibility for internal quality control through computation of the covariance matrix of the estimated parameters, (ii) the exploitation of any a priori known geometric and photometric information to constrain the solution and (iii) the simultaneous use of any number of images. The least squares approach allows for precision and reliability assessment of the estimated 3-D feature via covariance matrix evaluation. This is in clear contrast to conventional methods of Snakes, which due to their particular theoretical background and formulation, do not provide any measures for the qualitative control of their results. Instead of a set of points on the feature, a B-spline representation of the linear feature is estimated. Through the connection of image and object space, assuming that the interior and exterior orientation of the sensors are known, any number of images can be simultaneously accommodated and the feature can be extracted in a 2-D as well as in a fully 3-D mode. Thus blunders in image data, like occlusions, can be controlled very well. At the same time, LSB-Snakes can be considered a new application and extension of the least squares template matching (LSM) techniques. Our LSB-Snakes concept is not restricted to road extraction. Other linear features, e.g. edges, can be modelled and extracted. In fact, anything which can be geometrically modelled by B-splines can be handled. This makes it a powerful general concept for semiautomated feature extraction, not only for the processing of aerial and space images, but also for a variety of close-range (machine vision) applications. The results obtained so far are very encouraging. Further studies will make use of more extensive data sets and will focus on the quality assessment and automated performance evaluation. Numéro de notice : 66887 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : 10.3929/ethz-a-001766570 En ligne : http://dx.doi.org/10.3929/ethz-a-001766570 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61672 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 66887-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 66887-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
contenu dans ICC 97 proceedings 18th ICA/ACI International Cartographic Conference, 3. Volume 3 / L. Ottoson (1997)
Titre : Simulation and agent modelling for road selection in generalisation Type de document : Article/Communication Auteurs : Benoit Morisset, Auteur ; Anne Ruas , Auteur
Editeur : Gävle : Swedish Cartographic Society Année de publication : 1997 Conférence : ICC 1997, 18th international cartographic conference ICA 23/06/1997 27/06/1997 Stockholm Suède OA Proceedings Importance : pp 1376 - 1380 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] modèle orienté agent
[Termes IGN] réseau routier
[Termes IGN] simulation
[Termes IGN] système multi-agents
[Termes IGN] théorie des graphes
[Vedettes matières IGN] GénéralisationNuméro de notice : C1997-041 Affiliation des auteurs : IGN (1940-2011) Thématique : GEOMATIQUE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85238 Documents numériques
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Simulation and agent modellingAdobe Acrobat PDFThe second "Geodata for all in Europe" EUROGI workshop 1996: European standardisation strategies for GI and interoperability issues, Tome 1. Report / Eurogi (1997)
PermalinkThe second "Geodata for all in Europe" EUROGI workshop 1996: European standardisation strategies for GI and interoperability issues, Tome 2. Proceedings / Eurogi (1997)
PermalinkPermalinkPermalinkA dynamic decision tree structure supporting urban road network automated generalization / W. Peng in Cartographic journal (the), vol 33 n° 1 (June 1996)
PermalinkThe "map of Metlatoyuca" : a Mexican manuscript in the collection of the British museum / U. Berger in Cartographic journal (the), vol 33 n° 1 (June 1996)
PermalinkVers une interprétation automatique du réseau routier sur images aériennes : détection et analyse des carrefours / Renaud Ruskoné in Revue internationale de géomatique, vol 6 n° 2-3 (juin – août 1996)
PermalinkPhotogrammétrie numérique et interprétation d'image : exemple d'un processus de saisie du réseau routier / Sylvain Airault in Bulletin du comité français de cartographie, n° 146 - 147 (mars - août 1996)
PermalinkUtilisation d'un système d'information géographique pour l'interprétation automatique d'images aériennes / Ghislaine Bordes in Bulletin du comité français de cartographie, n° 146 - 147 (mars - août 1996)
Permalink18th international congress ISPRS, Volume 2. Technical Commission 2 Systems for data processing, analysis and representation / Karl Kraus (1996)
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