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Assessment of the relevance of information derived from the unmixing of polarimetric radar images / Sébastien Giordano (2015)
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Titre : Assessment of the relevance of information derived from the unmixing of polarimetric radar images Type de document : Article/Communication Auteurs : Sébastien Giordano , Auteur ; Grégoire Mercier, Auteur ; Jean-Paul Rudant
, Auteur
Editeur : New York : Institute of Electrical and Electronics Engineers IEEE Année de publication : 2015 Conférence : IGARSS 2015, International Geoscience And Remote Sensing Symposium 26/07/2015 31/07/2015 Milan Italie Proceedings IEEE Importance : pp 3778 - 3781 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] analyse des mélanges spectraux
[Termes IGN] décomposition spectrale
[Termes IGN] données polarimétriques
[Termes IGN] polarimétrie radar
[Termes IGN] polarisationMots-clés libres : unmixing radar polarimetry polarimetric decomposition Résumé : (auteur) A new method to unmix radar polarimetric images with optical images was proposed. This method has pointed out that the unmixing model is able to split off polarimetric information on a land cover type basis. In this paper unmixed radar polarimetric images obtained are compared with the observed ones in non-mixed conditions. Then, Cloude and Pottier decomposition is performed on the unmixed and observed radar images to asses whether the understanding of physical scattering mechanisms is improved with the unmixing. Finally, a classification experiment is designed to determine whether this fusion framework make the transfer of information from the optical images to the unmixed radar images possible. Numéro de notice : C2015-020 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : https://doi.org/10.1109/IGARSS.2015.7326646 Date de publication en ligne : 12/11/2015 En ligne : https://doi.org/10.1109/IGARSS.2015.7326646 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83179
Titre : Change detection from mobile laser scanning point clouds Titre original : Détection de changements à partir de nuages de points de cartographie mobile Type de document : Thèse/HDR Auteurs : Wen Xiao, Auteur ; Nicolas Paparoditis , Directeur de thèse ; Bruno Vallet
, Encadrant
Editeur : Champs/Marne : Université Paris-Est Marne-la-Vallée UPEM Année de publication : 2015 Importance : 110 p. Format : 21 x 30 cm Note générale : bibliographie
Thèse de doctorat présentée pour obtenir le grade de docteur Université Paris-Est, Ecole Doctorale MSTIC, spécialité Sciences et Technologies de l’Information GéographiqueLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] apprentissage dirigé
[Termes IGN] détection d'objet
[Termes IGN] détection de changement
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] instrumentation Riegl
[Termes IGN] objet mobile
[Termes IGN] semis de points
[Termes IGN] véhicule automobileMots-clés libres : occupancy-based method Index. décimale : THESE Thèses et HDR Résumé : (auteur) Mobile mapping systems are increasingly used for street environment mapping, especially mobile laser scanning technology enables precise street mapping, scene understanding, facade modelling, etc. In this research, the change detection from laser scanning point clouds is investigated. First of all, street environment change detection using RIEGL data is studied for the purpose of database updating and temporary object identification. An occupancy-based method is presented to overcome the challenges encountered by the conventional distance-based method, such as occlusion, anisotropic sampling. Occluded areas are identified by modelling the occupancy states within the laser scanning range. The gaps between points and scan lines are interpolated under the sensor reference framework, where the sampling density is isotropic. Even there are some conflicts on penetrable objects, e.g. trees, fences, the occupancy-based method is able to enhance the point-to-triangle distance-based method. The change detection method is also applied to data acquired by different laser scanners at different temporal-scales with the intention to have wider range of applications. The local sensor reference framework is adapted to Velodyne laser scanning geometry. The occupancy-based method is implemented to detection moving objects. Since the method detects the change of each point, moving objects are detect at point level. As the Velodyne scanner constantly scans the surroundings, the trajectories of moving objects can be detected. A simultaneous detection and tracking algorithm is proposed to recover the pedestrian trajectories in order to accurately estimate the traffic flow of pedestrian in public places. Changes can be detected not only at point level, but also at object level. The changes of cars parking on street sides at different times are detected to help regulate on-street car parking since the parking duration is limited. In this case, cars are detected in the first place, then they are compared with corresponding ones. Apart from car changes, parking positions and car types are also important information for parking management. All the processes are solved in a supervised learning framework. Furthermore, a model-based car reconstruction method is proposed to precisely locate cars. The model parameters are also treated as car features for better decision making. Moreover, the geometrically accurate models can be used for visualization purposes. Under the theme of change detection, related topics, e.g. tracking, classification, modelling, are also studied for the reason of practical applications. More importantly, the change detection methods are applied to different data acquisition geometries at multiple temporal-scales. Both bottom-up (point-based) and top-down (object-based) change detection strategies are investigated. Note de contenu : 1 Introduction
1.1 Motivation
1.1.1 Fine-scale change detection
1.1.2 Applications
1.2 Problems
1.3 Mobile mapping system and data
1.3.1 REIGL laser scanner
1.3.2 Velodyne laser scanner
1.4 Objectives
1.5 Structure
1.6 Contribution
2 State-of-the-art
2.1 Change detection methods
2.2 Change detection from imageries
2.3 Change detection from airborne lidar data
2.4 Change detection from terrestrial lidar data
2.5 Change detection in related domains
3 Street Environment Change Detection
3.1 Introduction
3.2 Contribution
3.3 Occupancy-based change detection
3.3.1 Laser Scanning Geometry
3.3.2 Occupancy modelling for an individual ray
3.3.3 Occupancy fusion and corresponding point retrieval
3.3.4 Consistency assessment between different epochs
3.4 Combination with distance-based change detection
3.5 Experiments and result
3.6 Evaluation and discussion
3.7 Conclusion
4 Simultaneous detection and tracking of pedestrian
4.1 Introduction
4.2 Related work
4.2.1 Pedestrian tracking in computer vision
4.2.2 Pedestrian tracking using laser scanning data
4.3 Methodology
4.3.1 Moving object detection
4.3.2 Simultaneous detection and tracking of pedestrian
4.3.3 Optimization
4.4 Experiments and results
4.4.1 Moving object detection
4.4.2 Pedestrian tracking
4.5 Discussions
4.6 Conclusion
5 Street-side car detection, classification and change detection
5.1 Introduction
5.2 Related work
5.2.1 Vehicle detection
5.2.2 Vehicle modelling
5.3 Methodology
5.3.1 Segmentation and feature extraction
5.3.2 Car modelling
5.3.3 Car recognition and localization
5.3.4 Car classification
5.3.5 Change detection
5.4 Experiments and results
5.4.1 Segmentation
5.4.2 Car modelling
5.4.3 Car recognition
5.4.4 Car classification
5.4.5 Change detection
5.5 Conclusion
6 Conclusion and perspectives
6.1 Summary
6.2 Conclusion
6.3 PerspectivesNuméro de notice : 17339 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : IMAGERIE/INFORMATIQUE Nature : Thèse française Note de thèse : Thèse de doctorat : Sciences et Technologies de l’Information Géographique : Paris-Est : 2015 Organisme de stage : MATIS (IGN) nature-HAL : Thèse DOI : sans En ligne : https://theses.hal.science/tel-01373359 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83191 Classification and change detection in multi - epoch airborne laser scanning point clouds / Sudan Xu (2015)
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Titre : Classification and change detection in multi - epoch airborne laser scanning point clouds Type de document : Thèse/HDR Auteurs : Sudan Xu, Auteur Editeur : Enschede [Pays Bas] : University of Twente Année de publication : 2015 Collection : ITC Dissertation num. 266 Importance : 121 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-90-365-3835-0 Note générale : bibliographie
Enschede, University of Twente, Faculty of Geo-Information and Earth Observation (ITC)Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] détection de changement
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] données multitemporelles
[Termes IGN] semis de pointsRésumé : (auteur) Detailed change detection in buildings using airborne laser scanning data (ALS data) has become possible with the availability of multi-temporal ALS data sets. In this thesis we present a methodology for building change detection in urban scenes, which is composed of two main parts: the classification of point clouds of an urban scene and the detection of changes in buildings. A classification methodology is put forward to solve the problem of how to detect buildings in point clouds and how to distinguish the building roofs, building roof elements, and building walls. The change detection methodology is not only used to detect changes but also aims to interpret the type of change that occurred to a building. The two methodologies are suitable for application to raw ALS laser points. They do not require the ALS data to be organised in Digital Surface Models.
The thesis consists of seven chapters. Chapter 1 gives the motivation of this research and an introduction to the background of the two main topics mentioned above. Research problems and questions are raised, and goals and objectives are defined on the two topics. Furthermore, the limits of the research scope of this thesis are set. Chapter 2 introduces the study area used in this thesis, the available data, including the data quality and the data organization, and some pre-processing steps of the data.
Chapter 3 describes the methodology of the classification, explaining the entities, features, classifiers and the classification strategy. We introduce a classification procedure that combines classifications of three different entities: points, planar segments, and segments obtained by mean-shift segmentation. Seven types of objects, namely, water, ground, vegetation, roof, roof element, wall and undefined object, are distinguished based on feature values of the entities. Some features were already defined in literature. Other features are defined by us. Five commonly used classifiers (rule based classification, Random Tree, AdaBoost, SVM, and ANN) are tested. The rule-based method provides over 99% accuracy for the ground and roof classes, and a minimum accuracy of 90% for the water, vegetation, wall and undefined object classes, resulting in an overall accuracy of 97%. The accuracy of the roof element class is only 70% with the rule-based method, or even lower with other classifiers. All experimental results for the classification methodology are presented and discussed in chapter 4. These results include the evaluation of the classification accuracy, comparisons between different classifiers and comparisons between different features derived from the different entities.
Chapter 5 explains the methodology of the change detection comprising a point-based change detection method and an object-based change analysis. The detection process starts with two data sets that are classified using the classification methodology in chapter 3. Next, a point-to-plane surface difference map is generated by merging the two data sets to be compared. By applying rules to the surface difference map the change status of points is set to "changed", "unchanged", or "unknown". Rules are defined to solve the problems caused by the lack of data. "Unknown" are locations where due to lack of data in at least one of the epochs it is not possible to reliably detect changes in the structure. Points on buildings labelled as "changed" are re-classified into changes related to roofs, walls, dormers, cars, constructions above roofs and undefined objects in a second classification step. Next, all the classified changes are grouped to changed building objects. Geometric descriptions of the changed building objects, such as the location of the centre point of the change objects, the height, area and volume of the change objects, are derived from their minimum 3D bounding boxes. Performance analysis showed that 80% - 90 % of the real changes are found, of which approximately 50% are considered relevant. The results of the change detection and analysis and their accuracy are discussed in chapter 6.
Finally, chapter 7 draws the main conclusions from the test results obtained with the classification and the change detection methodology. Limitations of our methodologies are summarized and potential solutions to these limitations are suggested.Note de contenu : 1- Introduction
2- Data sets
3- Methodology for the scene classification
4- Evaluation of the scene classification
5- Methodology for the change detection
6- Evaluation of the change detection
7- Conclusion ans perspectivesNuméro de notice : 14922 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD : Geo-Information and Earth Observation : University of Twente : 2015 En ligne : http://www.itc.nl/Pub/Home/library/Academic_output/AcademicOutput.html?l=16&y=15 Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77056 Documents numériques
en open access
Classification and change detection ... - pdf auteurAdobe Acrobat PDFContribution of textural information from TerraSAR-X image for forest mapping / Cécile Cazals (2015)
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Titre : Contribution of textural information from TerraSAR-X image for forest mapping Type de document : Article/Communication Auteurs : Cécile Cazals , Auteur ; H. Benelcadi, Auteur ; Pierre-Louis Frison
, Auteur ; Grégoire Mercier, Auteur ; Cédric Lardeux, Auteur ; Nesrine Chehata
, Auteur ; I. Champion, Auteur ; Jean-Paul Rudant
, Auteur
Editeur : New York : Institute of Electrical and Electronics Engineers IEEE Année de publication : 2015 Conférence : IGARSS 2015, International Geoscience And Remote Sensing Symposium 26/07/2015 31/07/2015 Milan Italie Proceedings IEEE Importance : pp 549 - 552 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] analyse discriminante
[Termes IGN] analyse texturale
[Termes IGN] classification par séparateurs à vaste marge
[Termes IGN] forêt
[Termes IGN] image radar moirée
[Termes IGN] image TerraSAR-XRésumé : (auteur) This study evaluates the potential of High Resolution Spotlight TerraSAR-X image for forest type discrimination. Emphasis is put on textural analysis accessible with high resolution radar data. Textural attributes are extracted from GLCM matrices, wavelet, and Fourier Transform (i.e. FOTO method). Their contribution for classification is assessed by their performance through the SVM algorithm. Numéro de notice : C2015-058 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : FORET/IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1109/IGARSS.2015.7325822 Date de publication en ligne : 12/11/2015 En ligne : http://dx.doi.org/10.1109/IGARSS.2015.7325822 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91805 Délimitation des parcelles agricoles par classification d'images Pléiades / Nesrine Chehata in Revue Française de Photogrammétrie et de Télédétection, n° 209 (Janvier 2015)
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[article]
Titre : Délimitation des parcelles agricoles par classification d'images Pléiades Type de document : Article/Communication Auteurs : Nesrine Chehata , Auteur ; Karim Ghariani, Auteur ; Arnaud Le Bris
, Auteur ; Philippe Lagacherie, Auteur
Année de publication : 2015 Conférence : Pleiades Days 2014 01/04/2014 03/04/2014 Toulouse France Proceedings IEEE Article en page(s) : pp 165 - 171 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] apprentissage automatique
[Termes IGN] classification dirigée
[Termes IGN] classification par forêts d'arbres décisionnels
[Termes IGN] image Pléiades-HR
[Termes IGN] parcelle agricole
[Termes IGN] prise en compte du contexte
[Termes IGN] segmentation d'imageRésumé : (Auteur) Les pratiques et les arrangements spatiaux des parcelles agricoles ont un fort impact sur les flux d’eau dans les paysages cultivés. Afin de surveiller les paysages à grande échelle, il y a un fort besoin de délimitation automatique ou semi-automatique des parcelles agricoles. Cet article montre la contribution des images satellitaires à très haute résolution spatiales, telles que Pléiades, pour délimiter le parcellaire agricole de manière automatique. Une approche originale utilisant une classification binaire supervisée des limites parcellaires est proposée. Une approche d’apprentissage actif est mise en oeuvre afin d’adapter le modèle de classifieur au contexte local permettant ainsi la délimitation parcellaire à grande échelle. Le classifieur des Forêts Aléatoires est utilisé pour la classification et la sélection des attributs. Le concept de marge non supervisée est utilisé comme mesure d’incertitude dans l’algorithme d’apprentissage actif. En outre, un étiquetage automatique des pixels incertains est proposé en utilisant une approche hybride combinant une approche région et le concept de marge. Des résultats satisfaisants sont obtenus sur une image Pléiades. Différentes stratégies d’apprentissage sont comparées et discutées. Pour un cas d’étude opérationnel, un modèle global ou bien un modèle simple enrichi peuvent être utilisés en fonction des données de terrain disponibles. Numéro de notice : A2015-083 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.52638/rfpt.2015.220 En ligne : https://doi.org/10.52638/rfpt.2015.220 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75447
in Revue Française de Photogrammétrie et de Télédétection > n° 209 (Janvier 2015) . - pp 165 - 171[article]Documents numériques
en open access
delimitation parcelles agricolesAdobe Acrobat PDFDémélange d’images radar polarimétrique par séparation thématique de sources / Sébastien Giordano (2015)
PermalinkDetection of abrupt changes in spatial relationships in video sequences / Abdalbassir Abou-Elailah (2015)
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PermalinkEtude de l'évolution de l'utilisation du sol dans le district Sunsari (plaine du Népal) depuis les années 1950 / Mathilde Dumont-Aublin (2015)
PermalinkEtude expérimentale en cartographie de la végétation par télédétection / Vanessa Sellin in Cybergeo, European journal of geography, n° 2015 ([01/01/2015])
PermalinkEvaluation de dégâts de tempête à l'échelle infra-parcellaire à partir d'une image Pléiades à très haute résolution sur un massif forestier feuillu en France / Anne Jolly in Revue Française de Photogrammétrie et de Télédétection, n° 209 (Janvier 2015)
PermalinkExtended random walker-based classification of hyperspectral images / Xudong Kang in IEEE Transactions on geoscience and remote sensing, vol 53 n° 1 (January 2015)
PermalinkHierarchical extraction of urban objects from mobile laser scanning data / Bisheng Yang in ISPRS Journal of photogrammetry and remote sensing, vol 99 (January 2015)
PermalinkHierarchical unsupervised change detection in multitemporal hyperspectral images / S. Liu in IEEE Transactions on geoscience and remote sensing, vol 53 n° 1 (January 2015)
PermalinkLand cover dynamics monitoring with Landsat data in Kunming, China: a cost-effective sampling and modelling scheme using Google Earth imagery and random forests / Ning Lu in Geocarto international, vol 30 n° 1 - 2 (January - February 2015)
PermalinkMediterranean forest species mapping using classification of Hyperion imagery / Georgia Galidaki in Geocarto international, vol 30 n° 1 - 2 (January - February 2015)
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