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scientifique

Interactive shearing for terrain visualization : an expert study / Jonas Buddeberg in Geoinformatica, vol 21 n° 3 (July - September 2017)  

Public [article]  inGeoinformatica > vol 21 n° 3 (July - September 2017) . - pp 643 - 665 Titre : Interactive shearing for terrain visualization : an expert study Type de document : Article/Communication Auteurs : Jonas Buddeberg, Auteur ; Bernhard Jenny, Auteur ; Wesley Willett, Auteur Année de publication : 2017 Article en page(s) : pp 643 - 665 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] animation graphique [Termes IGN] carte topographique [Termes IGN] extraction de traits caractéristiques [Termes IGN] extraction du relief [Termes IGN] figuré du terrain [Termes IGN] implémentation (informatique) [Termes IGN] lecture de carte [Termes IGN] test de performance [Termes IGN] visualisation 3D [Termes IGN] web mapping Résumé : (Auteur) Interpreting terrain in traditional 2D maps can be challenging. However, recent work has shown how interactive shearing of terrain can help users better understand topography and extract elevation information from a map. Using this approach, user input – paired with existing interactions such as pan and zoom – triggers brief ephemeral shearing animations that expose depth and shape information in terrain maps. The animations use motion to enhance the perception of depth and convey the impression of a shaking jelly model that oscillates until it comes to rest. However, it is still unclear how the parameters of these animations impact the effectiveness of the method or if the animations may have negative side effects. Moreover, it is unknown whether interactive relief shearing is accessible enough to be used in common web maps. To investigate these questions, we conducted a user study with 49 cartographers and visualization experts. These experts interactively configured shearing animations and assessed the technique’s usability and applicability. To create a platform for the user study and demonstrate that interactive shearing of terrain is technically feasible in browsers, we implemented a web map with interactive shearing animations. All experts found that interactive relief shearing made it easier to see differences in elevation on orthophoto maps. Future web maps could include shearing animations, making it easier for viewers to interpret terrain and see differences in elevation. Numéro de notice : A2017-385 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-016-0283-9 En ligne : https://doi.org/10.1007/s10707-016-0283-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85818 [article]

A simple but effective landslide detection method based on image saliency / Bo Yu in Photogrammetric Engineering & Remote Sensing, PERS, vol 83 n° 5 (May 2017)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 83 n° 5 (May 2017) . - pp 351 - 363 Titre : A simple but effective landslide detection method based on image saliency Type de document : Article/Communication Auteurs : Bo Yu, Auteur ; Fang Chen, Auteur ; Muhammad Shakir, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 351 - 363 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] détection de changement [Termes IGN] effondrement de terrain [Termes IGN] extraction du relief [Termes IGN] relief [Termes IGN] risque naturel Résumé : (auteur) Effective large-scale landslide mapping is becoming significantly important for analyzing natural hazards and providing landslide locations rapidly for emergency response. Change detection and machine learning methods are commonly used for landslide detection. Change detection mostly relies on several experienced parameters that users have to tune for different images, which limits the practical application. The training machine learning model consumes much time, and it is limited to specific imaging conditions. In this paper, a simple method for landslide detection using a fixed parameter by calculating image saliency is proposed. Landslide is detected as a saliency object within the background of vegetation and bare rocks. It is fast and robust for the experimental images, and outperforms the state-of-the-art, semi-automatic method in terms of accuracy and computing time. Given the high efficiency and robustness of the proposed method, it is applicable to practical cases for hazard estimation. Numéro de notice : A2017-190 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.83.5.351 En ligne : https://doi.org/10.14358/PERS.83.5.351 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84800 [article]

Development of a vector-based method for coastal bluffline mapping using LiDAR data and a comparison study in the area of lake Erie / Yunjae Choung in Marine geodesy, vol 36 n° 3 (September - November 2013)  

Public [article]  inMarine geodesy > vol 36 n° 3 (September - November 2013) . - pp 285 - 302 Titre : Development of a vector-based method for coastal bluffline mapping using LiDAR data and a comparison study in the area of lake Erie Type de document : Article/Communication Auteurs : Yunjae Choung, Auteur ; Rongxing Li, Auteur ; Myung-Hee Jo, Auteur Année de publication : 2013 Article en page(s) : pp 285 - 302 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] Erié, lac [Termes IGN] extraction du relief [Termes IGN] falaise [Termes IGN] Ohio (Etats-Unis) [Termes IGN] pente [Termes IGN] rivage [Termes IGN] triangulation de Delaunay Résumé : (Auteur) This paper introduces a new method for bluffline extraction based on analysis of surface normal vectors derived from a 2.5-dimensional Delaunay triangulation network generated using a set of LiDAR points. The developed method has been implemented and tested for the extraction of blufflines in a section of the Lake Erie coastline near Painesville, Ohio. Comparison of the research results with those generated by a method for bluffline extraction based on slope information along elevation profiles on transects shows an improvement in both horizontal and vertical accuracies in situations where the bluff has a relatively sharp edge formation. Numéro de notice : A2013-712 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/01490419.2013.813878 Date de publication en ligne : 03/11/2015 En ligne : https://doi.org/10.1080/01490419.2013.813878 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32848 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2013031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Topographic information of sand dunes as extracted from shading effects using Landsat images / N. Levin in Remote sensing of environment, vol 90 n° 2 (30/03/2004)  

Public [article]  inRemote sensing of environment > vol 90 n° 2 (30/03/2004) . - pp 190 - 209 Titre : Topographic information of sand dunes as extracted from shading effects using Landsat images Type de document : Article/Communication Auteurs : N. Levin, Auteur ; Eyal Ben-Dor, Auteur ; A. Karnieli, Auteur Année de publication : 2004 Article en page(s) : pp 190 - 209 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] analyse comparative [Termes IGN] angle azimutal [Termes IGN] appariement d'histogramme [Termes IGN] dénivelée [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] dune [Termes IGN] extraction du relief [Termes IGN] image Landsat-ETM+ [Termes IGN] image Landsat-TM [Termes IGN] image multitemporelle [Termes IGN] image Terra-ASTER [Termes IGN] Israël [Termes IGN] ombre [Termes IGN] pente [Termes IGN] réflectance Résumé : (Auteur) Topographic variations affect the reflectance properties of the Earth's surface and are often removed in remote sensing studies. especially when significant terrain variations exist. In this study, however, we show that shading effects assessed by Landsat can be treated as a signal that stores important topographic information, especially when the spectral characteristics of a surface are homogenous. The coastal transverse dunes of the Ashdod area, and the desert linear dunes of Nizzana (both located in Israel), were selected to investigate the above-mentioned idea. The dune heights in these areas are 10 m on average (relative to their surroundings) and have maximum slopes of 33°. An innovative method for extracting slope, aspect, and height data for sand dunes using Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) images was developed, based on the regularity and periodicity of dunes landscapes. Using two Landsat images representing different sun zenith and azimuth angles, reflectance values of each image were converted to cos(i) values (i =incident angle between the surface normal and the solar beam radiation), applying histogram matching methods. The slope and aspect of each pixel were determined as those that give the best prediction of the observed value of cos(i). Height profiles were then extracted, using simple trigonometric relationships. The accuracies of heights and slopes along selected profile lines were to the order of 1 m and 3°, respectively (at a spatial resolution of 15 m). Best results were obtained when the images included one from the summer and the other from the winter, corresponding to maximum difference in solar zenith and azimuth angles. Errors in heights were attributed to surface heterogeneity (e.g., presence of biogenic soil crusts in the rainy season), geometric correction errors, cast shadows, and Bidirectional Reflectance Distribution Function (BRDF) effects. Comparison to Advanced Thermal Emission and Reflection Radiometer (ASTER) 3D information showed that the proposed method is better in representing the topographic variation of the area than the digital elevation model (DEM) produced by ASTER. Numéro de notice : A2004-141 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2003.12.008 En ligne : https://doi.org/10.1016/j.rse.2003.12.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26668 [article]

New concepts in ecological modelling: talking to the land! / R.A. Macmillan in Geoinformatics, vol 7 n° 2 (01/03/2004)

Public [article]  inGeoinformatics > vol 7 n° 2 (01/03/2004) . - pp 46 - 49 Titre : New concepts in ecological modelling: talking to the land! Type de document : Article/Communication Auteurs : R.A. Macmillan, Auteur ; T.W. Goddard, Auteur Année de publication : 2004 Article en page(s) : pp 46 - 49 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] carte pédologique [Termes IGN] cartographie écologique [Termes IGN] extraction du relief [Termes IGN] modélisation spatiale [Termes IGN] objet géographique [Termes IGN] pente [Termes IGN] surface du sol Résumé : (Auteur) Over the last few decades, science has often presented us with detailed information at small points. We might know a lot about some experimental plots on two soil types in a country or a lot about water quality at the mouth of two large rivers. Today we are often asked the question "what is the status of X in all the places between those points?" or "which parts of a river basin are causing our peaks of chemical X in our monitoring program?" The tools described here not only have a wide application within a discipline such as soil science or forestry but have applications across a wide range of disciplines. Producing detailed soil capability maps for precision farming or environmental risk maps for environmental impact assessments are two other areas these tools are applicable. We are only beginning to visualize and experience how to use them to get a job done quicker, cheaper and more accurate. Numéro de notice : A2004-549 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27065 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
262-04021	SL	Revue	Centre de documentation	Revues en salle	Disponible

Etude et développement d'un outil d'extraction et d'appariement des éléments caractéristiques du relief à partir de modèles numériques de terrain / E. Colleu (2002)

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Restitution automatique du relief à partir de couples stéréoscopiques d'images du satellite Spot / Laurent Renouard (1991)

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Cartographic feature extraction with integrated SIR-B and Landsat TM images / R. Welch in International Journal of Remote Sensing IJRS, vol 9 n° 5 (May 1988)  

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