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UL-Isomap based nonlinear dimensionality reduction for hyperspectral imagery classification / Weiwei Sun in ISPRS Journal of photogrammetry and remote sensing, vol 89 (March 2014)
[article]
Titre : UL-Isomap based nonlinear dimensionality reduction for hyperspectral imagery classification Type de document : Article/Communication Auteurs : Weiwei Sun, Auteur ; Avner Halevy, Auteur ; John J. Benedetto, Auteur ; Chun Liu, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 25 - 36 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] carte isoplèthe
[Termes IGN] classification barycentrique
[Termes IGN] graphe
[Termes IGN] image hyperspectrale
[Termes IGN] isoligne
[Termes IGN] point de repère
[Termes IGN] précision de la classification
[Termes IGN] réduction géométrique
[Termes IGN] valeur propreRésumé : (Auteur) The paper proposes an upgraded landmark-Isometric mapping (UL-Isomap) method to solve the two problems of landmark selection and computational complexity in dimensionality reduction using Landmark Isometric mapping (LIsomap) for hyperspectral imagery (HSI) classification. First, the vector quantization method is introduced to select proper landmarks for HSI data. The approach considers the variations in local density of pixels in the spectral space. It locates the unique landmarks representing the geometric structures of HSI data. Then, random projections are used to reduce the bands of HSI data. After that, the new method incorporates the Recursive Lanczos Bisection (RLB) algorithm to construct the fast approximate k-nearest neighbor graph. The RLB algorithm accompanied with random projections improves the speed of neighbor searching in UL-Isomap. After constructing the geodesic distance graph between landmarks and all pixels, the method uses a fast randomized low-rank approximate method to speed up the eigenvalue decomposition of the inner-product matrix in multidimensional scaling. Manifold coordinates of landmarks are then computed. Manifold coordinates of non-landmarks are computed through the pseudo inverse transformation of landmark coordinates. Five experiments on two different HSI datasets are run to test the new UL-Isomap method. Experimental results show that UL-Isomap surpasses LIsomap, both in the overall classification accuracy (OCA) and in computational speed, with a speed over 5 times faster. Moreover, the UL-Isomap method, when compared against the Isometric mapping (Isomap) method, obtains only slightly lower OCAs. Numéro de notice : A2014-122 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2013.12.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2013.12.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33027
in ISPRS Journal of photogrammetry and remote sensing > vol 89 (March 2014) . - pp 25 - 36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2014031 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : 3D modeling of buildings : outstanding sites Type de document : Guide/Manuel Auteurs : Raphaële Heno , Auteur ; Laure Chandelier , Auteur Editeur : Londres : ISTE Editions Année de publication : 2014 Collection : GIS and territorial intelligence Importance : 202 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-1-84821-536-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] acquisition d'images
[Termes IGN] acquisition de données
[Termes IGN] appariement d'images
[Termes IGN] bâtiment
[Termes IGN] couple stéréoscopique
[Termes IGN] données de terrain
[Termes IGN] données laser
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] édifice religieux
[Termes IGN] élément remarquable
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] modélisation 3D
[Termes IGN] monument historique
[Termes IGN] ouvrage d'art
[Termes IGN] photogrammétrie architecturale
[Termes IGN] point d'appui
[Termes IGN] restitution 3D
[Termes IGN] semis de points
[Termes IGN] télémétrie laser terrestre
[Termes IGN] visualisation 3DIndex. décimale : 33.80 Lasergrammétrie Résumé : (Editeur) Conventional topographic databases, obtained by capture on aerial or spatial images provide a simplified 3D modeling of our urban environment, answering the needs of numerous applications (development, risk prevention, mobility management, etc.). However, when we have to represent and analyze more complex sites (monuments, civil engineering works, archeological sites, etc.), these models no longer suffice and other acquisition and processing means have to be implemented. This book focuses on the study of adapted lifting means for “notable buildings”. The methods tackled in this book cover lasergrammetry and the current techniques of dense correlation based on images using conventional photogrammetry. Note de contenu : - Specific Requirements for the 3D Digitization of Outstanding Sites.
- 3D Digitization Using Images.
- 3D Digitization by Laser Scanner.
- Complementarity of Techniques.
- Point Cloud Processing.
- Management and Use of Surveys.Numéro de notice : 22128 Affiliation des auteurs : ENSG (2012-2019) Thématique : IMAGERIE Nature : Manuel de cours nature-HAL : OuvrScient DOI : 10.1002/9781118648889 Date de publication en ligne : 26/06/2014 En ligne : http://dx.doi.org/10.1002/9781118648889 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63239 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22128-01 33.80 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Analysing landmarks in nature and elements of geospatial images to support wayfinding / Pyry Kettunen (2014)
Titre : Analysing landmarks in nature and elements of geospatial images to support wayfinding Type de document : Thèse/HDR Auteurs : Pyry Kettunen, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 2014 Collection : Publications of the Finnish Geodetic Institute, ISSN 0085-6932 num. 155 Importance : 150 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-951-711-312-0 Note générale : bibliographie
Doctoral dissertation for the degree of Doctor of Science in Technology (Doctor of Philosophy) to be presented with due permission of the School of Engineering for public examination and debate in Auditorium M1 at the Aalto University School of Engineering (Espoo, Finland) on the 4th of October 2014 at 12 noon.Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] carte en 3D
[Termes IGN] croquis topographique
[Termes IGN] oculométrie
[Termes IGN] point de repère
[Termes IGN] signalisation routièreMots-clés libres : landmark wayfinding spatial knowledge perception recall route nature geospatial image 3D map elevation eye tracking Résumé : (auteur) This dissertation applies the research and methods of spatial cognition in order to contribute to the development of wayfinding support in geospatial applications. The design and development of geospatial applications, such as interactive maps and mobile navigation applications, has been typically founded on the expertise of surveying, cartography and geoinformatics. This has often led to relatively complex expert tools that many users find difficult to use. The research of spatial cognition can provide elementary understanding about human thinking in the use situations of these applications and supplement the knowledge gained using the usability research. Perception of landmarks along routes in nature was studied in season and time-of-day studies with participants who walked nature trails in summer, winter, day and night while thinking aloud about the surroundings. The recall of the route was measured afterwards using sketch-map drawing and photo recognition tasks. The think-aloud protocols were analysed using classification of propositions and natural language processing. The importance of landmarks for the human route perception in nature was confirmed. “Structures”, “Passages” and “Waters” were the most perceived landmark groups. Season and time-of-day significantly affected landmark perception and, based on the results, the adaptivity of geospatial applications in the studied conditions can be improved. The transfer of the empirically acquired knowledge of the landmark perception to geoinformatics was illustrated with a formal landmark ontology for hiking in nature. The measures of landmark recall were found unexpectedly similar in all the studied conditions. The similarity was explained by the salience of landmarks in nature and the structure of route-like sketch maps but also by the participants’ conceptions on what should be drawn on maps. “Passages” and “Structures” were the most-often drawn landmark groups on the sketch maps. Support of geospatial images for wayfinding was evaluated using a literaturebased evaluation framework. Visualisation of elevation was experimented with by rendering a 3D map, a derivative of which was compared to 2D elevation visualisations in an eye-tracking study. Vertical elements and elevation were found to be central wayfinding elements in geo-images and the aerial oblique vantage point the most effective image parameter for transferring spatial knowledge. The rendered 3D map was evaluated as cognitively demanding to look at but, however, showed potential in representing the terrain relief. The dissertation also considers challenges in the application of the methods of spatial cognition research and identifies directions for future studies. Note de contenu : 1. Introduction
2. Literature review
3. Methods
4. Results
5. Discussion and conclusionsNuméro de notice : 14878 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD thesis : Science in Technology : Aalto University School of Engineering : 2014 En ligne : https://aaltodoc.aalto.fi/handle/123456789/14049 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75988 Numérisation 3D de bâtiments / Raphaële Heno (2014)
Titre : Numérisation 3D de bâtiments : cas des édifices remarquables Type de document : Guide/Manuel Auteurs : Raphaële Heno , Auteur ; Laure Chandelier , Auteur Editeur : Londres : ISTE Editions Année de publication : 2014 Collection : SIG et intelligence territoriale Importance : 173 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-1-78405-034-4 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] acquisition d'images
[Termes IGN] acquisition de données
[Termes IGN] appariement d'images
[Termes IGN] bâtiment
[Termes IGN] couple stéréoscopique
[Termes IGN] données de terrain
[Termes IGN] données laser
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] édifice religieux
[Termes IGN] élément remarquable
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] modélisation 3D
[Termes IGN] monument historique
[Termes IGN] ouvrage d'art
[Termes IGN] photogrammétrie architecturale
[Termes IGN] point d'appui
[Termes IGN] restitution 3D
[Termes IGN] semis de points
[Termes IGN] télémétrie laser terrestre
[Termes IGN] visualisation 3DIndex. décimale : 33.80 Lasergrammétrie Résumé : (Editeur) Les bases de données topographiques classiques, obtenues par images aériennes ou spatiales, fournissent une modélisation 3D simplifiée de notre environnement urbain. Ils répondent aux besoins de nombreuses applications, comme l'aménagement, la prévention des risques ou la gestion de la mobilité. Pourtant, lorsqu'il s'agit de représenter et d'analyser des sites plus complexes (monuments, ouvrages d'art, sites archéologiques, etc.), ils ne suffisent plus et d'autres moyens d'acquisition et de traitement doivent être mis en œuvre. Numérisation 3D de bâtiments a pour objet l'étude des moyens de levé adaptés aux édifices remarquables pour en restituer les formes avec un niveau de détail optimal. Les méthodes décrites dans cet ouvrage vont de la lasergrammétrie aux techniques modernes de corrélation dense, en passant par la photogrammétrie traditionnelle. Elles sont appelées à prendre le relais des techniques habituellement mises en œuvre pour la réalisation des bases de données topographiques, dans le cas de commandes spécifiques, comme la description du relief des façades et le relevé 3D complet (intérieur et extérieur) d'un monument. Note de contenu : Chapitre 1. Les besoins spécifiques à la numérisation 3D d'édifices remarquables
Chapitre 2. Numérisation à partir d'images
Chapitre 3. Numérisation par scanner laser
Chapitre 4. Complémentarité des techniques
Chapitre 5. Traitement des nuages de points
Chapitre 6. Gestion et exploitation des relevésNuméro de notice : 22094 Affiliation des auteurs : ENSG (2012-2019) Thématique : IMAGERIE Nature : Manuel de cours nature-HAL : OuvrScient DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63227 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22094-01 33.80 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 22094-02 33.80 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Resolution on the nomenclature of space geodetic reference points and local tie measurements / Sten Bergstrand (nov 2014)
Titre : Resolution on the nomenclature of space geodetic reference points and local tie measurements Type de document : Article/Communication Auteurs : Sten Bergstrand, Auteur ; Xavier Collilieux , Auteur ; John Dawson, Auteur ; Rüdiger Haas, Auteur ; Jim Long, Auteur ; Erricos C. Pavlis, Auteur ; Jérôme Saunier , Auteur ; Axel Nothnagel, Auteur Editeur : [s.l.] : [s.n.] Année de publication : nov 2014 Conférence : REFAG 2014, Reference Frames for Applications in Geosciences (IAG 2014 - Commission 1 symposium) 13/10/2014 17/10/2014 Kirchberg Grand Duché du Luxembourg Proceedings Springer Importance : 4 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] point de liaison (géodésie)
[Termes IGN] point de repère
[Termes IGN] terminologieRésumé : (auteur) We establish a specific but general terminology in order to clarify discussions on topics related to local tie measurements. The terminology meets the requirements of an observing system that encompasses existing International Earth Rotation and Reference Systems Service (IERS) techniques as well as other observation techniques of the Global Geodetic Observing System (GGOS). Numéro de notice : C2014-031 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.iers.org/SharedDocs/Publikationen/EN/IERS/WorkingGroups/SiteSurvey/B [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83276 Documents numériques
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