Descripteur
Documents disponibles dans cette catégorie (659)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Perceptually shaded slope maps for the visualization of digital surface models / Thomas J. Pingel in Cartographica, vol 49 n° 4 (Winter 2014)
[article]
Titre : Perceptually shaded slope maps for the visualization of digital surface models Type de document : Article/Communication Auteurs : Thomas J. Pingel, Auteur ; Keith C. Clarke, Auteur Année de publication : 2014 Article en page(s) : pp 225 - 240 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse visuelle
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] estompage automatique
[Termes IGN] lisibilité perceptive
[Termes IGN] modèle numérique de surface
[Termes IGN] ombre
[Termes IGN] relief
[Termes IGN] représentation du relief
[Termes IGN] visualisation de donnéesRésumé : (Auteur) Although shaded relief, or hillshaded, images are a widely used method to represent high-resolution (~1-m) digital surfaces derived from airborne laser (or LiDAR) scans, such displays may become difficult to interpret when they include surface features like buildings, roadways, and natural vegetation. One possible alternative as a visualization of such surface models is a representation based on slope shading – the steeper, the darker – but attenuated to the perceptual bias of overestimation of slope. The empirical work presented here demonstrates that Perceptually Shaded Slope Maps (PSSMs) perform as well or better than either hillshaded or hypsometric images on map-reading tasks, including profile estimation and mental rotation. Numéro de notice : A2014-650 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.3138/carto.49.4.2141 En ligne : http://dx.doi.org/10.3138/carto.49.4.2141 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75098
in Cartographica > vol 49 n° 4 (Winter 2014) . - pp 225 - 240[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 031-2014041 RAB Revue Centre de documentation En réserve L003 Disponible Automatic building extraction using a fuzzy active contour model / Mostafa Kabolizade in Photogrammetric Engineering & Remote Sensing, PERS, vol 80 n° 11 (November 2014)
[article]
Titre : Automatic building extraction using a fuzzy active contour model Type de document : Article/Communication Auteurs : Mostafa Kabolizade, Auteur ; Hamid Ebadi, Auteur ; Mehdi Mokhtarzade, Auteur Année de publication : 2014 Article en page(s) : pp 1061 - 1068 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] détection de contours
[Termes IGN] détection du bâti
[Termes IGN] extraction automatiqueRésumé : (Auteur) Automatic building extraction is currently an important research topic in the field of photagrammetry. An active contour model is a well-received approach in this field. This paper proposes an improved active contour model that focuses on building extraction from aerial images and lidar data. The main research concern in this paper is the development of energy functions to the optimum use of expert human knowledge in the overall process. Based on this approach, a new fuzzy inference system for evaluating energy functions was developed by modeling the human perception of various effective parameters in the energy functions. (Compared to the existing active contour models, the new algorithm is capable of directing the initial contour to building feature boundaries more quickly and robustly. Accuracy assessment showed that the proposed model is capable of achieving a shape accuracy of 98 percent and a total accuracy of 97 percent in complex urban areas. Numéro de notice : A2014-617 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.80.11.1061 En ligne : https://doi.org/10.14358/PERS.80.11.1061 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74923
in Photogrammetric Engineering & Remote Sensing, PERS > vol 80 n° 11 (November 2014) . - pp 1061 - 1068[article]Futur regard virtuel sur le Castrum romain d'Yverdon-les-Bains / Robert Michel in Géomatique suisse, vol 112 n° 11 (novembre 2014)
[article]
Titre : Futur regard virtuel sur le Castrum romain d'Yverdon-les-Bains Type de document : Article/Communication Auteurs : Robert Michel, Auteur Année de publication : 2014 Article en page(s) : pp 480 - 481 Langues : Français (fre) Allemand (ger) Italien (ita) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] fortification
[Termes IGN] patrimoine culturel
[Termes IGN] réalité augmentée
[Termes IGN] Vaud (Suisse)Résumé : (auteur) Le Castrum romain d'Yverdon-les-Bains, dans le canton de Vaud, est une ancienne fortification et une base navale édifiée au 4ème siècle de notre ère. Le site est classé d'importance nationale dans l'inventaire suisse du patrimoine culturel. La société du Castrum romain a été créée en 1978 pour mettre en valeur ce monument. Elle a décidé de réaliser ses objectifs grâce aux nouvelles technologies en mettant en chantier le projet d'une reconstruction du Castrum romain d'Eburodunum par l'utilisation de la réalité augmentée. Numéro de notice : A2014-590 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74850
in Géomatique suisse > vol 112 n° 11 (novembre 2014) . - pp 480 - 481[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 136-2014111 RAB Revue Centre de documentation En réserve L003 Disponible Sequential digital elevation models of active lava flows from ground-based stereo time-lapse imagery / M.R. James in ISPRS Journal of photogrammetry and remote sensing, vol 97 (November 2014)
[article]
Titre : Sequential digital elevation models of active lava flows from ground-based stereo time-lapse imagery Type de document : Article/Communication Auteurs : M.R. James, Auteur ; S. Robson, Auteur Année de publication : 2014 Article en page(s) : pp 160 – 170 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] Etna (volcan)
[Termes IGN] flux
[Termes IGN] image terrestre
[Termes IGN] Kilauea (volcan)
[Termes IGN] lave
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle stéréoscopiqueRésumé : (Auteur) We describe a framework for deriving sequences of digital elevation models (DEMs) for the analysis of active lava flows using oblique stereo-pair time-lapse imagery. A photo-based technique was favoured over laser-based alternatives due to low equipment cost, high portability and capability for network expansion, with images of advancing flows captured by digital SLR cameras over durations of up to several hours. However, under typical field scale scenarios, relative camera orientations cannot be rigidly maintained (e.g. through the use of a stereo bar), preventing the use of standard stereo time-lapse processing software. Thus, we trial semi-automated DEM-sequence workflows capable of handling the small camera motions, variable image quality and restricted photogrammetric control that result from the practicalities of data collection at remote and hazardous sites. The image processing workflows implemented either link separate close-range photogrammetry and traditional stereo-matching software, or are integrated in a single software package based on structure-from-motion (SfM). We apply these techniques in contrasting case studies from Kilauea volcano, Hawaii and Mount Etna, Sicily, which differ in scale, duration and image texture. On Kilauea, the advance direction of thin fluid lava lobes was difficult to forecast, preventing good distribution of control. Consequently, volume changes calculated through the different workflows differed by ∼10% for DEMs (over ∼30 m2) that were captured once a minute for 37 min. On Mt. Etna, more predictable advance (∼3 m h−1 for ∼3 h) of a thicker, more viscous lava allowed robust control to be deployed and volumetric change results were generally within 5% (over ∼500 m2). Overall, the integrated SfM software was more straightforward to use and, under favourable conditions, produced results comparable to those from the close-range photogrammetry pipeline. However, under conditions with limited options for photogrammetric control, error in SfM-based surfaces may be difficult to detect. Numéro de notice : A2014-529 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2014.08.011 En ligne : https://doi.org/10.1016/j.isprsjprs.2014.08.011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74142
in ISPRS Journal of photogrammetry and remote sensing > vol 97 (November 2014) . - pp 160 – 170[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2014111 RAB Revue Centre de documentation En réserve L003 Disponible Integration of Lidar and Landsat to estimate forest canopy cover in coastal British Columbia / Oumer S. Ahmed in Photogrammetric Engineering & Remote Sensing, PERS, vol 80 n° 10 (October 2014)
[article]
Titre : Integration of Lidar and Landsat to estimate forest canopy cover in coastal British Columbia Type de document : Article/Communication Auteurs : Oumer S. Ahmed, Auteur ; Steven E. Franklin, Auteur ; Michael A. Wulder, Auteur Année de publication : 2014 Article en page(s) : pp 953 - 961 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse des mélanges spectraux
[Termes IGN] canopée
[Termes IGN] Colombie-Britannique (Canada)
[Termes IGN] couvert forestier
[Termes IGN] données lidar
[Termes IGN] feuillu
[Termes IGN] image Landsat
[Termes IGN] occupation du sol
[Termes IGN] PinophytaRésumé : (auteur) Airborne Light Detection and Ranging (lidar) data provide useful measurements of forest canopy structure but are often limited in spatial coverage. Satellite remote sensing data from Landsat can provide extensive spatial coverage of generalized forest information. A forest survey approach that integrates airborne lidar and satellite data would potentially capitalize upon these distinctive characteristics. In this study in coastal forests of British Columbia, the main objective was to determine the potential of Landsat imagery to accurately estimate forest canopy cover measured from small-footprint airborne lidar data in order to expand the lidar measurements to a larger area. Landsat-derived Tasseled Cap Angle (TCA) and spectral mixture analysis (SMA) endmember fractions (i.e., sunlit canopy, non-phofosynthetic vegetation (NPV), shade and exposed soil) were compared to lidar-derived canopy cover estimates. Pixel-based analysis and object-based area-weighted error calculations were used to assess regression model performance. The best canopy cover estimate was obtained (in the object-based deciduous forest models) with a mean object size (MOS) of 2.5 hectares (adjusted R2 = O.86 and RMSE = 0.28). Overall, lower canopy cover estimation accuracy was obtained for coniferous forests compared to deciduous forests in both the pixel and object-based approaches. Numéro de notice : A2014-672 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.80.10.953 En ligne : https://doi.org/10.14358/PERS.80.10.953 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75152
in Photogrammetric Engineering & Remote Sensing, PERS > vol 80 n° 10 (October 2014) . - pp 953 - 961[article]Multi-view 3D circular target reconstruction with uncertainty analysis / Bahman Soheilian in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol II-3 (September 2014)PermalinkProjective texturing uncertain geometry: silhouette-aware box-filtered blending using integral radial images / Mathieu Brédif in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol II-3 (September 2014)PermalinkDéveloppement et exploitation d'un produit de type "image solide". Application à l'analyse géostructurale des ouvrages rocheux de la SNCF / Antoine Gozé in XYZ, n° 140 (septembre - novembre 2014)PermalinkDirect georeferencing of oblique and vertical imagery in different coordinate systems / H. Zhao in ISPRS Journal of photogrammetry and remote sensing, vol 95 (September 2014)PermalinkEvaluation of structure from motion for soil microtopography measurement / Sayjro K. Nouwakpo in Photogrammetric record, vol 29 n° 147 (September - November 2014)PermalinkFlexible mixed reality and situated simulation as emerging forms of Geovisualization / Chris Lonergan in Cartographica, vol 49 n° 3 (September 2014)PermalinkGenerating pit-free canopy height models from airborne lidar / Anahita Khosravipour in Photogrammetric Engineering & Remote Sensing, PERS, vol 80 n° 9 (September 2014)PermalinkOrthophotographie nocturne à haute résolution / Anonyme in Géomatique expert, n° 100 (01/09/2014)PermalinkPerformances et limitations de la corrélation diachronique d'images pour les ouvrages d'art / Julien Comte in XYZ, n° 140 (septembre - novembre 2014)PermalinkA practical target recognition system for close range photogrammetry / M.R. Shortis in Photogrammetric record, vol 29 n° 147 (September - November 2014)Permalink