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Automated Swiss-style relief shading and rock hachuring / Roman Geisthövel in Cartographic journal (the), Vol 55 n° 4 (November 2018)  

Public [article]  inCartographic journal (the) > Vol 55 n° 4 (November 2018) . - pp 341 - 361 Titre : Automated Swiss-style relief shading and rock hachuring Type de document : Article/Communication Auteurs : Roman Geisthövel, Auteur ; Lorenz Hurni, Auteur Année de publication : 2018 Article en page(s) : pp 341 - 361 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes descripteurs IGN] carte topographique [Termes descripteurs IGN] cartographie étrangère [Termes descripteurs IGN] estompage analytique [Termes descripteurs IGN] généralisation cartographique [Termes descripteurs IGN] représentation du relief [Termes descripteurs IGN] style cartographique [Termes descripteurs IGN] Suisse Résumé : (Auteur) Rock depiction in Swiss topographic maps has evolved from humble line drawings into expressive renderings indicating slope, aspect and traversability. In this paper, an automatic method to derive monochrome Swiss-style rock hachures from a raster elevation model is presented. The proper placement and light modulation of the linear strokes depend on the availability of sound foundations for both terrain generalization and relief shading, for which two novel methods are introduced. The generalization applies line integral convolution along slope lines to the elevation values. The resulting smoothed raster has the footprint of its steep faces enlarged to increase the map space available for steep faces. The shaded relief is generated with the focus on terrain edges, unlike common raster cell-based methods. The rock hachures are modulated according to the grey values of the shaded relief. Finally, we present two topographic maps that demonstrate this new method of depicting relief. Numéro de notice : A2018-592 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2018.1551955 date de publication en ligne : 01/03/2019 En ligne : https://doi.org/10.1080/00087041.2018.1551955 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92566 [article]

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A method of downscaling temperature maps based on analytical hillshading for use in species distribution modelling / Ángel M. Felicísimo in Cartography and Geographic Information Science, Vol 45 n° 4 (July 2018)  

Public [article]  inCartography and Geographic Information Science > Vol 45 n° 4 (July 2018) . - pp 329 - 338 Titre : A method of downscaling temperature maps based on analytical hillshading for use in species distribution modelling Type de document : Article/Communication Auteurs : Ángel M. Felicísimo, Auteur ; Miguel A. Martín-Tardío, Auteur Année de publication : 2018 Article en page(s) : pp 329 - 338 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes descripteurs IGN] carte climatique [Termes descripteurs IGN] carte thématique [Termes descripteurs IGN] distribution spatiale [Termes descripteurs IGN] estompage analytique [Termes descripteurs IGN] image Landsat-8 [Termes descripteurs IGN] modèle numérique de terrain [Termes descripteurs IGN] rayonnement solaire [Termes descripteurs IGN] température Résumé : (Auteur) Climate maps have been widely used for the construction of species distribution models. These maps derive from interpolation of data collected by meteorological stations. The sparse distribution of stations generates maps with coarse spatial resolution that are unable to detect microclimates or areas that can serve as plant or animal refuges. This work proposes a method for downscaling temperature maps using the solar radiation falling upon hillsides as predictor for the influence of relief on local variability. Solar irradiance is estimated from a digital elevation model of the study area using a routine based on analytical hillshading. Some examples of downscaling from 1 km to 25 m spatial resolution are shown. The results are compared with the surface temperature maps from Landsat 8 satellite imagery. Numéro de notice : A2018-134 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2017.1338620 date de publication en ligne : 19/06/2017 En ligne : https://doi.org/10.1080/15230406.2017.1338620 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89666 [article]

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Progressive block graying and landmarks enhancing as intermediate representations between buildings and urban areas / Guillaume Touya (2017) 

Public contenu dans Proceedings of 20th ICA Workshop on Generalisation and Multiple Representation / International cartographic association = association cartographique internationale (2017)   Titre : Progressive block graying and landmarks enhancing as intermediate representations between buildings and urban areas Type de document : Article/Communication Auteurs : Guillaume Touya , Auteur ; Marion Dumont , Auteur Congrès : Congrès: ICC 2017 28th International Cartographic Conference ICA (2 - 7 juillet 2017; Washington DC, Etats-Unis) , Commanditaire Editeur : ICA Commission on Generalisation and Multiple Representation Année de publication : 2017 Importance : 10 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] analyse multicritère [Termes descripteurs IGN] apprentissage automatique [Termes descripteurs IGN] base de données cartographiques [Termes descripteurs IGN] estompage automatique [Termes descripteurs IGN] généralisation du bâti [Termes descripteurs IGN] point de repère [Termes descripteurs IGN] relation spatiale [Termes descripteurs IGN] zone urbaine [Termes descripteurs IGN] zoom [Vedettes matières IGN] Généralisation Résumé : (Auteur) Geovisualization applications that allow the navigation between maps at different scales while zooming in and out often provide no smooth transition between the individual building level of abstraction and the representation of whole urban areas as polygons. In order to reduce the cognitive load of the user, we seek to add intermediate zoom levels with intermediate and progressive abstractions between buildings and urban areas. This paper proposes a method based on progressive block graying while enhancing building landmarks, to derive these intermediate representations from the individual buildings. Block graying is based on an automatic building classification, and a multiple criteria decision technique to infer inner city blocks. The landmarks identification relies on machine learning and several criteria based on geometry and spatial relations. The method is tested with real cartographic data between the 1:25k (with individual buildings) and the 1:100k scale (with urban areas): transitions with one, two, or three intermediate representations are derived and tested. Numéro de notice : C2017-007 Affiliation des auteurs : IGN (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86201

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Perceptually shaded slope maps for the visualization of digital surface models / Thomas J. Pingel in Cartographica, vol 49 n° 4 (December 2014)  

Public [article]  inCartographica > vol 49 n° 4 (December 2014) . - pp 225 - 240 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 descripteurs IGN] analyse visuelle [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] données localisées 3D [Termes descripteurs IGN] estompage automatique [Termes descripteurs IGN] lisibilité perceptive [Termes descripteurs IGN] modèle numérique de surface [Termes descripteurs IGN] ombre [Termes descripteurs IGN] relief [Termes descripteurs IGN] représentation du relief [Termes descripteurs IGN] visualisation de données Résumé : (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 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 [article]

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Changing the light azimuth in shaded relief representation by clustering aspect / Fabio Veronesi in Cartographic journal (the), vol 51 n° 4 (November 2014)

Public [article]  inCartographic journal (the) > vol 51 n° 4 (November 2014) . - pp 291 - 300 Titre : Changing the light azimuth in shaded relief representation by clustering aspect Type de document : Article/Communication Auteurs : Fabio Veronesi, Auteur ; Lorenz Hurni, Auteur Année de publication : 2014 Article en page(s) : pp 291 - 300 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes descripteurs IGN] ArcGIS [Termes descripteurs IGN] estompage automatique [Termes descripteurs IGN] ombre [Termes descripteurs IGN] représentation du relief [Termes descripteurs IGN] segmentation d'image [Termes descripteurs IGN] système d'information géographique Résumé : (Auteur) Manual shading, traditionally produced manually by specifically trained cartographers, is still considered superior to automatic methods, particularly for mountainous landscapes. However, manual shading is time-consuming and its results depend on the cartographer and as such difficult to replicate consistently. For this reason there is a need to create an automatic method to standardize its results. A crucial aspect of manual shading is the continuous change of light direction (azimuth) and angle (zenith) in order to better highlight discrete landforms. Automatic hillshading algorithms, widely available in many geographic information systems (GIS) applications, do not provide this feature. This may cause the resulting shaded relief to appear flat in some areas, particularly in areas where the light source is parallel to the mountain ridge. In this work we present a GIS tool to enhance the visual quality of hillshading. We developed a technique based on clustering aspect to provide a seamless change of lighting throughout the scene. We also provide tools to change the light zenith according to either elevation or slope. This way the cartographer has more room for customizing the shaded relief representation. Moreover, the method is completely automatic and this guarantees consistent and reproducible results. This method has been embedded into an ArcGIS toolbox. Numéro de notice : A2014-641 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75086 [article]

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Effects of cartographic elevation visualizations and map-reading tasks on eye movements / Katja Putto in Cartographic journal (the), vol 51 n° 3 (August 2014)

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Landscape preference and map readability in design evaluation of topographic maps with an orthoimage background / Paulo Raposo in Cartographic journal (the), vol 51 n° 1 (February 2014)

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Visual abstraction and stylisation of maps / Tobias Isenberg in Cartographic journal (the), vol 50 n° 1 (February 2013)

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Multidirectional visibility index for analytical shading enhancement / T. Podobnikar in Cartographic journal (the), vol 49 n° 3 (August 2012)  

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Automated reduction of visual complexity in small-scale relief shading / A. Leonowicz in Cartographica, vol 45 n° 1 (March 2010)  

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Swiss-style colour relief shading modulated by elevation and by exposure to illumination / B. Jenny in Cartographic journal (the), vol 43 n° 3 (December 2006)

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A uniform sky illumination model to enhance shading of terrain and urban areas / Patrick Kennelly in Cartography and Geographic Information Science, vol 33 n° 1 (January 2006)  

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[Adaptation de données géographiques à une charte graphique imposée] / Luc Pialoux (2005)

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Hillshading of terrain using layer tints with aspect-variant luminosity / Patrick Kennelly in Cartography and Geographic Information Science, vol 31 n° 2 (April 2004)

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The representation of topographic information on maps: The depiction of relief / P. Collier in Cartographic journal (the), vol 40 n° 1 (June 2003)

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