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Segmentation and reconstruction of polyhedral building roofs from aerial lidar points clouds / A. Sampath in IEEE Transactions on geoscience and remote sensing, vol 48 n° 3 Tome 2 (March 2010)
[article]
Titre : Segmentation and reconstruction of polyhedral building roofs from aerial lidar points clouds Type de document : Article/Communication Auteurs : A. Sampath, Auteur ; J. Shan, Auteur Année de publication : 2010 Article en page(s) : pp 1554 - 1567 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] analyse de groupement
[Termes IGN] cohérence géométrique
[Termes IGN] détection du bâti
[Termes IGN] diagramme de Voronoï
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] intégrité topologique
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] segmentation
[Termes IGN] semis de points
[Termes IGN] similitude
[Termes IGN] toitRésumé : (Auteur) This paper presents a solution framework for the segmentation and reconstruction of polyhedral building roofs from aerial LIght Detection And Ranging (lidar) point clouds. The eigenanalysis is first carried out for each roof point of a building within its Voronoi neighborhood. Such analysis not only yields the surface normal for each lidar point but also separates the lidar points into planar and nonplanar ones. In the second step, the surface normals of all planar points are clustered with the fuzzy k-means method. To optimize this clustering process, a potential-based approach is used to estimate the number of clusters, while considering both geometry and topology for the cluster similarity. The final step of segmentation separates the parallel and coplanar segments based on their distances and connectivity, respectively. Building reconstruction starts with forming an adjacency matrix that represents the connectivity of the segmented planar segments. A roof interior vertex is determined by intersecting all planar segments that meet at one point, whereas constraints in the form of vertical walls or boundary are applied to determine the vertices on the building outline. Finally, an extended boundary regularization approach is developed based on multiple parallel and perpendicular line pairs to achieve topologically consistent and geometrically correct building models. This paper describes the detail principles and implementation steps for the aforementioned solution framework. Results of a number of buildings with diverse roof complexities are presented and evaluated. Numéro de notice : A2010-272 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2009.2030180 Date de publication en ligne : 03/11/2009 En ligne : https://doi.org/10.1109/TGRS.2009.2030180 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30466
in IEEE Transactions on geoscience and remote sensing > vol 48 n° 3 Tome 2 (March 2010) . - pp 1554 - 1567[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2010031B RAB Revue Centre de documentation En réserve L003 Disponible The effect of instructions on distance and similarity judgements in information spatializations / Sara Irina Fabrikant in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
[article]
Titre : The effect of instructions on distance and similarity judgements in information spatializations Type de document : Article/Communication Auteurs : Sara Irina Fabrikant, Auteur ; Daniel R. Montello, Auteur Année de publication : 2008 Article en page(s) : pp 463 - 478 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie
[Termes IGN] détail topographique
[Termes IGN] distance euclidienne
[Termes IGN] représentation cognitive
[Termes IGN] similitude
[Termes IGN] visualisation de donnéesRésumé : (Auteur) We investigate the relationship of perceived distances to judged similarities between document points in various types of spatialized displays. Our findings suggest that the distance-similarity relationship is not as self-evident to viewers as is commonly assumed in the information visualization literature. We further investigate how participants interpret instructions to judge distances when those instructions do or do not specify the type of distance. We find that in all types of spatialization displays, there is no significant difference between default and direct judgements of distance; people clearly interpret default distance instructions to refer to direct (straight-line) distance. These findings provide direct evidence on the conditions under which people employ distance when assessing similarity between data objects in various types of spatialized views and, when they do, which type of distance. They also give insight into how people explore the similarity of geographic features depicted in cartographic maps or GIS displays. Copyright Taylor & Francis Numéro de notice : A2008-150 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701517096 En ligne : https://doi.org/10.1080/13658810701517096 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29145
in International journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 463 - 478[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08031 RAB Revue Centre de documentation En réserve L003 Disponible 079-08032 RAB Revue Centre de documentation En réserve L003 Disponible Transforming ellipsoidal heights and geoid undulations between different geodetic reference frames / Christopher Kotsakis in Journal of geodesy, vol 82 n° 4-5 (April - May 2008)
[article]
Titre : Transforming ellipsoidal heights and geoid undulations between different geodetic reference frames Type de document : Article/Communication Auteurs : Christopher Kotsakis, Auteur Année de publication : 2008 Article en page(s) : pp 249 - 260 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées cartésiennes
[Termes IGN] coordonnées curvilignes
[Termes IGN] ellipsoïde de référence
[Termes IGN] géoïde gravimétrique
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] repère de référence
[Termes IGN] similitude
[Termes IGN] transformation de HelmertRésumé : (Auteur) Transforming height information that refers to an ellipsoidal Earth reference model, such as the geometric heights determined from GPS measurements or the geoid undulations obtained by a gravimetric geoid solution, from one geodetic reference frame (GRF) to another is an important task whose proper implementation is crucial for many geodetic, surveying and mapping applications. This paper presents the required methodology to deal with the above problem when we are given the Helmert transformation parameters that link the underlying Cartesian coordinate systems to which an Earth reference ellipsoid is attached. The main emphasis is on the effect of GRF spatial scale differences in coordinate transformations involving reference ellipsoids, for the particular case of heights. Since every three-dimensional Cartesian coordinate system ‘gauges’ an attached ellipsoid according to its own accessible scale, there will exist a supplementary contribution from the scale variation between the involved GRFs on the relative size of their attached reference ellipsoids. Neglecting such a scale-induced indirect effect corrupts the values for the curvilinear geodetic coordinates obtained from a similarity transformation model, and meter-level apparent offsets can be introduced in the transformed heights. The paper explains the above issues in detail and presents the necessary mathematical framework for their treatment. Copyright Springer Numéro de notice : A2008-169 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0179-4 En ligne : https://doi.org/10.1007/s00190-007-0179-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29164
in Journal of geodesy > vol 82 n° 4-5 (April - May 2008) . - pp 249 - 260[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08042 RAB Revue Centre de documentation En réserve L003 Disponible 266-08041 RAB Revue Centre de documentation En réserve L003 Disponible A comparison of geometric approaches to assessing spatial similarity for GIR / P. Frontiera in International journal of geographical information science IJGIS, vol 22 n° 3 (march 2008)
[article]
Titre : A comparison of geometric approaches to assessing spatial similarity for GIR Type de document : Article/Communication Auteurs : P. Frontiera, Auteur ; R. Larson, Auteur ; J. Radke, Auteur Année de publication : 2008 Article en page(s) : pp 337 - 360 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] approximation
[Termes IGN] indexation spatiale
[Termes IGN] pertinence
[Termes IGN] recherche d'information géographique
[Termes IGN] requête spatiale
[Termes IGN] similitudeRésumé : (Auteur) This research compares the geographic information retrieval (GIR) performance of a set of logistic regression models with those of five non-probabilistic methods that compute a spatial similarity score for a query-document pair. All methods are applied to a test collection of queries and documents indexed spatially by two convex conservative geometric approximations: the minimum bounding box (MBB) and the convex hull. In the comparison, the tested logistic regression models outperform, in terms of standard information retrieval recall and precision measures, all of the non-probabilistic methods. The retrieval performance achieved by the logistic regression models on MBB approximations is similar to that achieved by the use of the non-probabilistic methods on convex hulls. Although these results are valid only for the test collection used in this study, they suggest that a logistic regression approach to GIR provides an alternative to the use of higher-quality geometric representations that are more difficult to obtain, implement, and process. Additionally, this research demonstrates the ability of a probabilistic approach to effectively incorporate information about geographic context in the spatial ranking process. Copyright Taylor & Francis Numéro de notice : A2008-143 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701626293 En ligne : https://doi.org/10.1080/13658810701626293 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29138
in International journal of geographical information science IJGIS > vol 22 n° 3 (march 2008) . - pp 337 - 360[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08021 RAB Revue Centre de documentation En réserve L003 Disponible 079-08022 RAB Revue Centre de documentation En réserve L003 Disponible Using angular and spectral shape similarity constraints to improve MISR aerosol and surface retrievals over land / D. Diner in Remote sensing of environment, vol 94 n° 2 (30/01/2005)
[article]
Titre : Using angular and spectral shape similarity constraints to improve MISR aerosol and surface retrievals over land Type de document : Article/Communication Auteurs : D. Diner, Auteur ; J.V. Martonchik, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 155 - 171 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] aérosol
[Termes IGN] image Terra-MISR
[Termes IGN] photométrie
[Termes IGN] réflectance de surface
[Termes IGN] similitudeRésumé : (Auteur) The Multi-angle Imaging SpectroRadiometer (MISR) instrument on the Terra satellite has demonstrated the capability to retrieve aerosol optical depths, surface bidirectional reflectance factors, and hemispherical reflectances over a wide variety of land surface types. In particular, multiangular imaging design has enabled the application of algorithms that minimize sensitivity of the aerosol retrievals to the brightness of the underlying surface. The novel aerosol algorithm that was developed prior to launch has had notable quantitative success. Over certain types, however, the approach contained obvious spatial artifacts, so a postlaunch refinement to the algorithm was implemented. It constrains the retrieved aerosol models and optical depths such that the implied angular shape of the surface hemispherical-directional reflectance factor (HDRF) is similar among all of the MISR wavelengths. This upgrade has resulted in three tangible benefits: (1) the .occurrence of outliers has been dramatically reduced, (2) correlations with AERosol RObotic NETwork (AERONET) aerosol surnphotometer data are quantitatively improved, and (3) the quality of surface products is markedly enhanced. MISR Level 2 aerosol and surface products archived at the NASA Langley Atmospheric Sciences Data Center. Those having version numbers v0012 and higher incorporate this upgrade in the data processing software. Numéro de notice : A2005-013 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.09.009 En ligne : https://doi.org/10.1016/j.rse.2004.09.009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27152
in Remote sensing of environment > vol 94 n° 2 (30/01/2005) . - pp 155 - 171[article]The distance-similarity metaphor in network-display spatialisations / Sara Irina Fabrikant in Cartography and Geographic Information Science, vol 31 n° 4 (October 2004)PermalinkImage numérique couleur, de l'acquisition au traitement / Alain Trémeau (2004)PermalinkFuzzy set approach to assessing similarity of categorical maps / Alex Hagen-Zanker in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)PermalinkScale and orientation-invariant scene similarity metrics for image queries / A. Stefanidis in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)Permalink3D shape histograms for similarity search and classification in spatial databases / M. Ankerst (20/07/1999)PermalinkAdvances in spatial data bases, 5th International Symposium, SSD '97, Berlin, Germany, July 15-18 1997 / Agnès Voisard (1997)PermalinkCaricature des virages par lissage de la courbure / Emmanuel Fritsch (1997)PermalinkAppariement d'images par invariants locaux de niveaux de gris : application à l'indexation d'une base d'objets / Cordelia Schmid (1996)PermalinkLecture automatique des écritures sur cartes scannées / Marc Pierrot-Deseilligny in Traitement du signal, vol 12 n° 6 (01/12/1995)PermalinkKartographische Mustererkennung : rasterorientierte Verfahren zur Erfassung von Geo-informationen / Roland Eduard Stengele (1995)PermalinkApport de la fusion d'images satellitaires multicapteurs au niveau pixel en télédétection et photo-interprétation / M. Mangolini (1994)PermalinkMathématiques, enseignement de spécialité terminale TS programme 1994 / G. Bontemps (1994)Permalink