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Combination of image descriptors for the exploration of cultural photographic collections / Neelanjan Bhowmik in Journal of Electronic Imaging, vol 26 n° 1 (January - February 2017)
[article]
Titre : Combination of image descriptors for the exploration of cultural photographic collections Type de document : Article/Communication Auteurs : Neelanjan Bhowmik , Auteur ; Valérie Gouet-Brunet , Auteur ; Gabriel Bloch, Auteur ; Sylvain Besson, Auteur Année de publication : 2017 Projets : POEME / Da Silva, Jean-Claude Article en page(s) : pp 1 - 13 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'images
[Termes IGN] classification barycentrique
[Termes IGN] collection
[Termes IGN] fusion de données
[Termes IGN] image numérisée
[Termes IGN] moteur de recherche
[Termes IGN] patrimoine culturel
[Termes IGN] régression
[Termes IGN] web des donnéesRésumé : (Auteur) The rapid growth of image digitization and collections in recent years makes it challenging and burdensome to organize, categorize, and retrieve similar images from voluminous collections. Content-based image retrieval (CBIR) is immensely convenient in this context. A considerable number of local feature detectors and descriptors are present in the literature of CBIR. We propose a model to anticipate the best feature combinations for image retrieval-related applications. Several spatial complementarity criteria of local feature detectors are analyzed and then engaged in a regression framework to find the optimal combination of detectors for a given dataset and are better adapted for each given image; the proposed model is also useful to optimally fix some other parameters, such as the k in k-nearest neighbor retrieval. Three public datasets of various contents and sizes are employed to evaluate the proposal, which is legitimized by improving the quality of retrieval notably facing classical approaches. Finally, the proposed image search engine is applied to the cultural photographic collections of a French museum, where it demonstrates its added value for the exploration and promotion of these contents at different levels from their archiving up to their exhibition in or ex situ. Numéro de notice : A2017-189 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1117/1.JEI.26.1.011019 Date de publication en ligne : 19/12/2016 En ligne : http://dx.doi.org/10.1117/1.JEI.26.1.011019 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84799
in Journal of Electronic Imaging > vol 26 n° 1 (January - February 2017) . - pp 1 - 13[article]Géomatique et géo-décisionnel appliqués au Référentiel des territoires du département de l’Hérault / Stanislas Cheptou (2017)
Titre : Géomatique et géo-décisionnel appliqués au Référentiel des territoires du département de l’Hérault Type de document : Mémoire Auteurs : Stanislas Cheptou, Auteur Editeur : Paris : Université de Paris 1 Panthéon Sorbonne Année de publication : 2017 Autre Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Importance : 127 p. Format : 21 x 30 cm Note générale : Bibliographie, annexes
Mémoire de licence professionnelle Géomatique et environnementLangues : Français (fre) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] adresse postale
[Termes IGN] base de données localisées
[Termes IGN] chaîne de traitement
[Termes IGN] FME
[Termes IGN] Hérault (34)
[Termes IGN] mise à jour de base de donnéesIndex. décimale : LPGE Mémoires de Licence professionnelle géomatique et environnement Résumé : (Auteur) Dans le cadre de la Licence Géomatique & Environnement co-habilitée entre l’Université Paris 1 Panthéon-Sorbonne et l’ENSG, j’ai effectué mon stage de fin d’étude au sein du Conseil départemental de l’Hérault à Montpellier. Ce rapport de stage traite du Référentiel des Territoires, une base de données incluant différents zonages et les ponctuels Adresse de l’IGN pour le département de l’Hérault. Après avoir expliqué globalement ce qu’est le Référentiel des Territoires du CD34 et quels en sont les usages, ce rapport décrit et illustre le cheminement de réflexion et de production de trois outils FME visant à réaliser une mise à jour de la source du Référentiel. La suite d’outils ABCD34, ComBA et ABA34 permet d’améliorer, de comparer et d’actualiser la Base Adresse source du Référentiel. Un descriptif précis de chaque outil est développé dans ce rapport. Ce rapport décrit les différents échanges et réflexions faites autour d’un second objectif principal : Contribuer à la mise au point d’un processus liant les différents organismes traitant l’Adresse sur le territoire de l’Hérault (CD34, IGN, Service des mairies de Montpellier, Béziers, Sète, Lunel) afin de mutualiser leurs efforts dans le but de fiabiliser la Base ADRESSE. D’autres missions sont abordées comme la création de cartographie des élections législatives 2017 ou encore la création de fiches d’information via la fonction « page dynamique » de ArcMap. Note de contenu : 1 - Introduction
2 - Présentation de la structure d'accueil
3 - Le référentiel des territoires
4 - Mises à jour de la Base Adresse CD34
5 - Mission : Contribuer à la mise au point d’un processus liant les différents organismes traitant l’Adresse sur le territoire de l’Hérault
6 - Mission : Cartographie Elections Législatives 2017
7 - Mission : Renfort DGA-AT Pôle routes et transports
8 - ConclusionNuméro de notice : 21308 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Mémoire licence Organisme de stage : Conseil départemental de l'Hérault Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90002
Titre : Level of detail in 3D city models Type de document : Thèse/HDR Auteurs : Filip Biljecki, Auteur ; Jantien E. Stoter, Auteur ; Hugo Ledoux, Auteur Editeur : Delft [Pays-Bas] : Delft University of Technology Année de publication : 2017 Note générale : bibliographie
Doctoral dissertation, Delft university of technologyLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse de sensibilité
[Termes IGN] bâtiment
[Termes IGN] CityGML
[Termes IGN] erreur en position
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] niveau de détail
[Termes IGN] propagation d'erreur
[Termes IGN] SIG 3D
[Termes IGN] spécificationRésumé : (auteur) The concept of level of detail (LOD) describes the content of 3D city models and it plays an essential role during their life cycle. On one hand it comes akin to the concepts of scale in cartography and LOD in computer graphics, on the other hand it is a standalone concept that requires attention. LOD has an influence on tendering and acquisition, and it has a hand in storage, maintenance, and application aspects. However, it has not been significantly researched, and this PhD thesis fills this void. This thesis reviews dozens of current LOD standards, revealing that most practitioners consider the LOD to be comprised solely of the geometric detail of data and there are disparate views on the concept as a whole. However, the research suggests that the LOD encompasses additional metrics, such as semantics and texture. The thesis formalises the concept, enabling integration and comparison of current LOD standards. The established framework may be applied to cartography and to different forms of 3D geoinformation such as point clouds. Following the formalised concept, a new LOD specification is presented improving the LOD concept in the current OGC CityGML 2.0 standard, a prominent norm in the 3D GIS industry. The specification introduces 16 LODs for buildings that are shaped after analysing the capabilities of acquisition techniques and a large number of real-world datasets. The improved LOD specification may be integrated in product portfolios and tenders, preventing misunderstandings between stakeholders, and as a better language for communicating the specifics of a dataset to be acquired. The specification also considers different approaches to realise the data. Such geometric references result in dozens of different variants of the same LOD.3D data according to the LOD specification was generated using a procedural modelling engine that was developed over the course of the research. The engine is capable of producing 3D city models in a large number of different variants and according to the CityGML standard. The thesis also catalogues the many different ways to create 3D city models. A prominent technique for producing data in a different LOD is generalisation, i.e. simplifying a 3D city model. The inverse---augmenting the LOD of a dataset---has not been researched to a great extent, and this thesis gives an overview of the topic. This research demonstrates that it is possible to generate 3D city models without elevation measurements, inherently augmenting the LOD of coarser data (2D footprints). The method relies on machine learning: several attributes found in 2D datasets may hint at the height of a building, thus enabling extrusion and creating 3D city models suited for several applications.Some acquisition techniques may result in multi-LOD datasets, and nowadays there are some regions represented in different, independent datasets. However, it was found that possibilities to link such data are deficient. The lack of linking mechanisms inhibits acquisition, storage, and maintenance of multi-LOD data. Two methods for linking features across two or more LODs have been developed resulting in an increased consistency of multi-LOD datasets. The first method links matching geometries across multiple LODs, while the second method establishes a 4D data structure in which the LOD is modelled as the fourth (spatial) dimension.It is often believed that the more detailed 3D data the better. However, similarly as in computer graphics, dealing with data at fine LODs comes at a cost: such datasets are harder to obtain, their storage footprint is large, and their usage within a spatial analysis may be slow. Scarce research has been dedicated to investigating whether an increase in the LOD of the data brings a comparably significant increase in benefits when the data is used in a spatial analysis.First, an analysis using real-world multi-LOD data was carried out. Different LODs of spatial data covering the Netherlands was used in a spatial analysis to refine population maps, obtaining different results for each LOD. However, several problems are exposed, revealing that using real data for such investigations is not optimal.The remainder of the research focuses on using procedurally generated data for such experiments. Synthetic data in several different LODs has been generated and employed for four spatial analyses (estimation of the building shadow, envelope area, volume, and solar irradiation). The experiments result in different conclusions. Finer LODs usually bring some improvement to the quality of the spatial analysis, but not always and such may be negligible. The results of the experiments ultimately depend on the spatial analysis that is considered. The varying results between different spatial analyses make each of them unique. Furthermore, the benefit a finer LOD brings to a spatial analysis is not always clear and easily measurable. In short, striving to produce data at finer LODs may please the eye, but this is not always counter-balanced in the benefit it brings to a spatial analysis.A further addition to the equation above is that when realised, 3D city models are unavoidably burdened with acquisition errors. An error propagation analysis was performed by disturbing the procedurally generated datasets with a range of simulated positional errors. Comparisons have been made between the intentionally degraded datasets and their error-free counterparts, thus obtaining the magnitude of uncertainty the positional errors cause in a spatial analysis. Based on these experiments, several findings are discovered, most importantly:1. How the LODs are realised (which geometric references are used) has a larger influence than the LOD. A coarse LOD produced with a favourable geometric reference may yield better results than a finer LOD realised with an unfavourable reference.2. Positional errors considerably affect spatial analyses. The effect is comparable across similar LODs. Simpler LODs are sligthly less affected by positional errors, but they may contain a large systematic error.3. Errors induced in the acquisition process generally cancel out the improvement provided by finer LODs. The main conclusion is that in the considered spatial analyses the positional error has a significantly higher impact than the LOD. As a consequence, it is suggested that it is pointless to acquire geoinformation at a fine LOD if the acquisition method is not accurate, and instead it is advised to focus on the improvement of accuracy of the data. The thesis proposes additional research for future work. For example, since this research focuses specifically on 3D building models, it would be worth extending the research to other urban features such as roads and vegetation. Furthermore, quality control in 3D GIS does not encompass the evaluation of the LOD of data. Hence integration of the LOD in quality standards should be a priority for future work. Note de contenu : 1- Introduction
2- Background
3- Formalisation of LOD
4- Designing an LOD specification for buildings
5- Variants of LODs
6- Realisation of the specification
7- Generating 3D city models without elevation data
8- Managing multi-LOD data
9- Influence of LOD on spatial analyses (I)
10- Influence of LOD on spatial analyses (II)
11- Sensitivity of LOD to positional errors
12- Combining LOD and positional errors
13- Conclusions and future prospectsNuméro de notice : 17541 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Thèse étrangère Note de thèse : Doctoral dissertation : : Delft university of technology : 2017 DOI : 10.4233/uuid:f12931b7-5113-47ef-bfd4-688aae3be248 En ligne : https://repository.tudelft.nl/islandora/object/uuid%3Af12931b7-5113-47ef-bfd4-68 [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91250 Mapping and the citizen sensor, ch 13. VGI in national mapping agencies: experiences and recommendations / Ana-Maria Olteanu-Raimond (2017)
Titre de série : Mapping and the citizen sensor, ch 13 Titre : VGI in national mapping agencies: experiences and recommendations Type de document : Chapitre/Contribution Auteurs : Ana-Maria Olteanu-Raimond , Auteur ; Mari Laakso, Auteur ; Vyron Antoniou, Auteur ; Cidália Costa Fonte, Auteur ; Alexandra Fonseca, Auteur ; Magdalena Grus, Auteur ; Jenny Harding, Auteur ; Tobias Kellenberger, Auteur ; Marco Minghini, Auteur ; Andriani Skopeliti, Auteur Editeur : Londres : Ubiquity press Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données localisées des bénévoles
[Termes IGN] organisme cartographique national
[Termes IGN] qualité des donnéesRésumé : (auteur) Despite the considerable growth in Volunteered Geographic Information (VGI) activities in citizen sensing and the evident opportunities for VGI use in map revision and updating, few European National Mapping Agencies (NMAs) or other types of government bodies have engaged significantly with VGI. Moreover, the level of engagement of NMAs with the VGI community varies greatly, and most of them have proposed their own tools for encouraging citizens and public partners to collect feedback or new data. There are numerous barriers limiting the participation of citizens and public partners in NMA data collection, including data quality issues, the motivation of the contributors and legal issues. The aim of this chapter is to give an overview of the experiences of some European NMAs in engaging with VGI. Guidelines and recommendations to support wider engagement with the VGI community are also proposed to help NMAs and interested government bodies exploit the potential of VGI for authoritative mapping. Numéro de notice : H2017-017 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Chapître / contribution nature-HAL : ChOuvrScient Date de publication en ligne : 11/09/2017 En ligne : https://doi.org/10.5334/bbf.m Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89337
Titre : Mapping heterogeneous data: a case study on the French Green Infrastructure Type de document : Article/Communication Auteurs : Cécile Duchêne , Auteur ; Sébastien Mustière , Auteur ; Sandrine Gomes, Auteur ; Mathilde Kremp, Auteur ; Lucille Billon, Auteur ; Romain Sordello, Auteur Editeur : ICA Commission on Generalisation and Multiple Representation Année de publication : 2017 Conférence : ICA 2017, 20th ICA Workshop on Generalisation and Multiple Representation 01/07/2017 02/07/2017 Washington DC Etats-Unis OA program Importance : 9 p. Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] carte thématique
[Termes IGN] données hétérogènes
[Termes IGN] France (administrative)
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] harmonisation des données
[Termes IGN] interopérabilité
[Termes IGN] trame verte et bleue
[Termes IGN] utilisation du solRésumé : (auteur) To achieve a preservation and restoration of ecosystems, public environmental policies at the international level are fostering the implementation of Green Infrastructures, i.e. networks composed of areas where animal and vegetal species can live (habitat patches), and corridors to circulate between them. In France, defining existing habitat patches and corridors was ensured in a distributed manner by the Regions, the first subnational administrative level, with flexible guidelines. It resulted in very heterogeneous data in terms of level of detail, raising the question: “How to map such heterogeneous data at a supra-regional level, making them understandable while respecting the work of Regions, and with a reasonable amount of human work?”. Our study focuses on habitat patches of two adjacent Regions. After making a “rough” map directly from the provided data, we explore three ways for homogenizing the map. The first method consists in generalizing the more detailed data using simple morphologic operators. The second method consists in graphically refining the less detailed data by filling the areas with a pattern taken from the more detailed data. The third method consists in drastically changing the level of abstraction of the data on both regions, while rasterizing the space. Although it would be necessary to test the resulting maps on potential users, we think the third approach is probably the only one usable. Numéro de notice : C2017-035 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89950 Documents numériques
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