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Exploiting illusory grid lines for object-location memory performance in urban topographic maps / Frank Dickmann in Cartographic journal (the), Vol 54 n° 3 (August 2017)
Titre : Exploiting illusory grid lines for object-location memory performance in urban topographic maps Type de document : Article/Communication Auteurs : Frank Dickmann, Auteur ; Dennis Edler, Auteur ; Anne-Kathrin Bestgen, Auteur ; Lars Kuchinke, Auteur Année de publication : 2017 Article en page(s) : pp 242-253 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie
[Termes IGN] carte interactive
[Termes IGN] carte topographique
[Termes IGN] géopositionnement
[Termes IGN] quadrillage
[Termes IGN] symbole graphique
[Termes IGN] système d'information géographique
[Termes IGN] topologieRésumé : (Auteur) In order to be successful in spatial orientation tasks, people need to recall locations and configurations of spatial objects from their memory. This understanding of geographic space often arises from experience with cartographic media representing topographic and topological information by graphic symbols. Learning spatial information from graphic media is influenced by different perception-based grouping effects distorting the accuracy of spatial object-positions and their relations. Such geometric inaccuracies can be softened by adding a grid layer, which regionalizes the map and can be used as an additional orientation pattern. This grid layer usually consists of solid lines and overlays semantic information. The present paper reports the results of two empirical studies on object-location memory (OLM) performance. In these studies, the amount of visual detail of the grid layer was reduced. By positioning the grid layer below specific urban topographic objects (study 1), the grid pattern was graphically interrupted. These interrupted grid lines were completed by cognitive completion mechanisms (illusory grid lines) described in the Gestalt principles of closure and continuation. The second experiment examined the maximum grid line gap that is closed by cognitive line completion and keeps an advantage for OLM (study 2). Numéro de notice : A2017-693 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2016.1236509 En ligne : https://doi.org/10.1080/00087041.2016.1236509 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88003
in Cartographic journal (the) > Vol 54 n° 3 (August 2017) . - pp 242-253[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 030-2017031 RAB Revue Centre de documentation En réserve L003 Disponible 
Titre : Enhancing building footprints with squaring operations Type de document : Article/Communication Auteurs : Imran Lokhat Année de publication : 2016 Article en page(s) : pp 33 - 60 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] base de données localisées
[Termes IGN] bati
[Termes IGN] empreinte
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] méthode des moindres carrés
[Termes IGN] OpenStreetMap
[Termes IGN] quadrillage
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Whatever the data source, or the capture process, the creation of a building footprint in a geographical dataset is error prone. Building footprints are designed with square angles, but once in a geographical dataset, the angles may not be exactly square. The almost-square angles blur the legibility of the footprints when displayed on maps, but might also be propagated in further applications based on the footprints, e.g., 3D city model construction. This paper proposes two new methods to square such buildings: a simple one, and a more complex one based on nonlinear least squares. The latter squares right and flat angles by iteratively moving vertices, while preserving the initial shape and position of the buildings. The methods are tested on real datasets and assessed against existing methods, proving the usefulness of the contribution. Direct applications of the squaring transformation, such as OpenStreetMap enhancement, or map generalization are presented. Numéro de notice : A2016--117 Affiliation des auteurs : LASTIG COGIT (2012-2019) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5311/JOSIS.2016.13.276 En ligne : http://josis.org/index.php/josis/article/view/276 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84777
in Journal of Spatial Information Science, JoSIS > n° 13 (September 2016) . - pp 33 - 60[article]Documents numériques
en open access
Enhancing building footprints ... - pdf éditeurAdobe Acrobat PDF
Titre : A three-dimensional Douglas-Peucker algorithm and its application to automated generalization of DEMs Type de document : Article/Communication Auteurs : Fei Lifan, Auteur ; Jianhua He, Auteur Année de publication : 2009 Article en page(s) : pp 703 - 718 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] algorithme de Douglas-Peucker
[Termes IGN] données localisées 3D
[Termes IGN] généralisation automatique de données
[Termes IGN] généralisation de MNT
[Termes IGN] modèle numérique de surface
[Termes IGN] quadrillage
[Termes IGN] quantité discrèteRésumé : (Auteur) This article reviews the formation of the 3-D Douglas-Peucker algorithm on the basis of analyzing the nature of the 2-D algorithm and further studies the application of the 3-D method to the automated global generalization of digital elevation model (DEM). Compared to the general 3-D Douglas-Peucker algorithm put forward by the authors in the previous publication, further improvements and expansion of the algorithm have been included in this article, namely, (1) for randomly distributed points, 'loneliness index' of the current point has been taken as the dynamic weight factor of the point-plane distance, so as to improve the selection of the feature points; (2) aiming at the mass volume of the regular square grids, which forms the majority of the DEM data; three measures have been suggested in this article for the improvement of the efficiency of the automated generalization. Experiments have proven that these measures can greatly heighten the efficiency of the DEM generalization with satisfactory results and have offered us the practical possibility of on-the-fly global generalization of DEM with a huge volume of data. Copyright Taylor & Francis Numéro de notice : A2009-314 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810701703001 En ligne : https://doi.org/10.1080/13658810701703001 Format de la ressource électronique : u Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29944
in International journal of geographical information science IJGIS > vol 23 n° 6 (june 2009) . - pp 703 - 718[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-09041 RAB Revue Centre de documentation En réserve L003 Disponible 079-09042 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Digital terrain modelling with 3D visualisation Type de document : Article/Communication Auteurs : F. Muyoba, Auteur Année de publication : 2009 Article en page(s) : pp 26 - 31 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] écoulement des eaux
[Termes IGN] modèle numérique de terrain
[Termes IGN] Namibie
[Termes IGN] outil d'aide à la décision
[Termes IGN] quadrillage
[Termes IGN] relief
[Termes IGN] visualisation 3DRésumé : (Editeur) Felix Muyoba takes us back to Namibia, demonstrating what 3D visualisation can do for decision makers in government and business. Copyright Geo:Geoconnexion Numéro de notice : A2009-120 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29750
in GEO: Geoconnexion international > vol 8 n° 3 (march 2009) . - pp 26 - 31[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 062-09031 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Dynamic hybrid terrain representation based on convexity limits identification Type de document : Article/Communication Auteurs : M. Bóo, Auteur ; M. Amor, Auteur Année de publication : 2009 Article en page(s) : pp 417 - 439 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] convexité
[Termes IGN] modèle numérique de terrain
[Termes IGN] planification urbaine
[Termes IGN] quadrillage
[Termes IGN] tessellation
[Termes IGN] triangle
[Termes IGN] Triangulated Irregular Network
[Termes IGN] visualisation 3DRésumé : (Auteur) Hybrid digital terrain models combine terrain data with different topologies and resolutions. Cartographic digital terrain models are typically composed of regular grid data that can be locally refined by adding a Triangulated Irregular Network (TIN) that represents morphologically complex terrain parts. Direct rendering of both datasets to visualize the digital terrain model generates discontinuities, as the meshes are disconnected. The utilization of complete/partial precomputed tessellation solutions solves the problem of quality, but limits the applicability of the representation to models with a fixed relative position between datasets. In this paper, we present a new scheme for hybrid terrain representation that permits the dynamic generation of the adaptive tessellation required to join the grid and TIN models. Our proposal permits the dynamic modification of the relative position between datasets. This increases the representation capabilities for those applications where this property is interesting as, for example, urban and landscape planning applications. The algorithm we propose is based on the identification of convex areas on the TIN and the efficient generation of triangles to join the models based on this convex structure. As a result, high quality models without discontinuities are obtained, increasing the flexibility of previous solutions based on fixed precomputations. Copyright Taylor & Francis Numéro de notice : A2009-157 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810801932039 En ligne : https://doi.org/10.1080/13658810801932039 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29787
in International journal of geographical information science IJGIS > vol 23 n°3-4 (march - april 2009) . - pp 417 - 439[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-09021 RAB Revue Centre de documentation En réserve L003 Disponible 079-09022 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkPermalinkCours de cartographie : gravure et dessin, 3. Troisième et quatrième parties, La cartographie à l'IGN, la cartographie moderne / Marcel Huguenin (1948)
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