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Topologically safe curved schematisation / Arthur Van Goethem in Cartographic journal (the), vol 50 n° 3 (August 2013)  

Public [article]  inCartographic journal (the) > vol 50 n° 3 (August 2013) . - pp 276 - 285 Titre : Topologically safe curved schematisation Type de document : Article/Communication Auteurs : Arthur Van Goethem, Auteur ; Wouter Meulemans, Auteur ; Andreas W. Reimer, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 276 - 285 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] courbe [Termes IGN] courbe de Bézier [Termes IGN] diagramme de Voronoï [Termes IGN] généralisation automatique de données [Termes IGN] généralisation cartographique automatisée [Termes IGN] intégrité topologique [Termes IGN] simplification de contour Résumé : (Auteur) Traditionally schematised maps make extensive use of curves. However, automated methods for schematisation are mostly restricted to straight lines. We present a generic framework for topology-preserving curved schematisation that allows a choice of quality measures and curve types. The framework fits a curve to every part of the input. It uses Voronoi diagrams to ensure that curves fitted to disjoint parts do not intersect. The framework then employs a dynamic program to find an optimal schematisation using the fitted curves. Our fully-automated approach does not need critical points or salient features. We illustrate our framework with Bézier curves and circular arcs. Numéro de notice : A2013-467 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277413Y.0000000066 En ligne : https://doi.org/10.1179/1743277413Y.0000000066 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32605 [article]

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A symmetry detector for map generalization and urban-space analysis / Jan‐Henrik Haunert in ISPRS Journal of photogrammetry and remote sensing, vol 74 (Novembrer 2012)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 74 (Novembrer 2012) . - pp 66 - 77 Titre : A symmetry detector for map generalization and urban-space analysis Type de document : Article/Communication Auteurs : Jan‐Henrik Haunert, Auteur Année de publication : 2012 Article en page(s) : pp 66 - 77 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] agrégation de détails [Termes IGN] analyse spatiale [Termes IGN] bati [Termes IGN] Boston (Massachusetts) [Termes IGN] données vectorielles [Termes IGN] empreinte [Termes IGN] généralisation cartographique automatisée [Termes IGN] polygone [Termes IGN] simplification de contour [Vedettes matières IGN] Généralisation Résumé : (Auteur) This article presents an algorithmic approach to the problem of finding symmetries in building footprints, which is motivated by map generalization tasks such as symmetry-preserving building simplification and symmetry-aware grouping and aggregation. Moreover, symmetries in building footprints may be used for landmark selection and building classification. The presented method builds up on existing methods for symmetry detection in vector data that use algorithms for string matching. It detects both mirror symmetries and repetitions of geometric structures. In addition to the existing vector-based methods, the new method finds partial symmetries in polygons while allowing for small geometric errors and, based on a least-squares approach, computes optimally adjusted mirror axes and assesses their quality. Finally, the problem of grouping symmetry relations is addressed with an algorithm that finds mirror axes that are almost collinear. The presented approach was tested on a large building dataset of the metropolitan Boston area and its results were compared with results that were manually generated in an empirical test. The symmetry relations that the participants of the test considered most important were found by the algorithm. Future work will deal with the integration of information on symmetry relations into algorithms for map generalization. Numéro de notice : A2012-604 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.08.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.08.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32050 [article]

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Using snakes for the registration of topographic road database objects to ALS features / J. Göpfert in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 6 (November 2011)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 66 n° 6 (November 2011) . - pp 858 - 871 Titre : Using snakes for the registration of topographic road database objects to ALS features Type de document : Article/Communication Auteurs : J. Göpfert, Auteur ; Franz Rottensteiner, Auteur ; Christian Heipke, Auteur Année de publication : 2011 Article en page(s) : pp 858 - 871 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] algorithme snake [Termes IGN] appariement de données localisées [Termes IGN] base de données routières [Termes IGN] contour [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] données topographiques [Termes IGN] modèle numérique de paysage [Termes IGN] objet géographique [Termes IGN] optimisation (mathématiques) [Termes IGN] réseau routier Résumé : (Auteur) For historical reasons many national mapping agencies store their topographic data in a dual system consisting of a Digital Landscape Model (DLM) and a Digital Terrain Model (DTM). The DLM contains 2D vector data representing objects on the Earth’s surface, such as roads and rivers, whereas the DTM is a 2.5D representation of the related height information, often acquired by Airborne Laser Scanning (ALS). Today, many applications require reliable 3D topographic data. Therefore, it is advantageous to convert the dual system into a 3D DLM. However, as a result of different methods of acquisition, processing, and modelling, the registration of the two data sets often presents difficulties. Thus, a straightforward integration of the DTM and DLM might lead to inaccurate and semantically incorrect 3D objects. $In this paper we propose a new method for the fusion of the two data sets that exploits parametric active contours (also called snakes), focusing on road networks. For that purpose, the roads from a DLM initialise the snakes, defining their topology and their internal energy, whereas ALS features exert external forces to the snake via the image energy. After the optimisation process the shape and position of the snakes should coincide with the ALS features. With respect to the robustness of the method several known modifications of snakes are combined in a consistent framework for DLM road network adaptation. One important modification redefines the standard internal energy and thus the geometrical model of the snake in order to prevent changes in shape or position not caused by significant features in the image energy. For this purpose, the initial shape is utilized creating template-like snakes with the ability of local adaptation. This is one crucial point towards the applicability of the entire method considering the strongly varying significance of the ALS features. Other concepts related to snakes are integrated which enable our method to model network and ribbon-like characteristics simultaneously. Additionally, besides ALS road features information about context objects, such as bridges and buildings, is introduced as part of the image energy to support the optimisation process. Meaningful examples are presented that emphasize and evaluate the applicability of the proposed method. Numéro de notice : A2011-473 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.08.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.08.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31367 [article]

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Simultaneous & topologically-safe line simplification for a variable-scale planar partition / Martijn Meijers (31/01/2011) 

Public contenu dans Advancing geoinformation science for a changing world / Stan Geertman (2011)   Titre : Simultaneous & topologically-safe line simplification for a variable-scale planar partition Type de document : Article/Communication Auteurs : Martijn Meijers, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 31/01/2011 Conférence : AGILE 2011, 14th International Conference on Geographic Information Science, Advancing Geoinformation Science for a Changing World 18/04/2011 21/04/2011 Utrecht Pays-Bas Proceedings Springer Importance : pp 337 - 358 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation automatique de données [Termes IGN] graphe planaire [Termes IGN] lissage de courbe [Termes IGN] partition de surface [Termes IGN] simplification de contour [Vedettes matières IGN] Généralisation Résumé : (Auteur) We employ a batch generalization process for obtaining a variable-scale planar partition. We describe an algorithm to simplify the boundary lines after a map generalization operation (either a merge or a split operation) has been applied on a polygonal area and its neighbours. The simplification is performed simultaneously on the resulting boundaries of the new polygonal areas that replace the areas that were processed. As the simplification strategy has to keep the planar partition valid, we define what we consider to be a valid planar partition (among other requirements, no zero-sized areas and no unwanted intersections in the boundary polylines). Furthermore, we analyse the effects of the line simplification for the content of the data structures in which the planar partition is stored. Numéro de notice : C2011-023 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64364

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Classics in cartography / Martin Dodge (2011)

Public Titre : Classics in cartography : reflections on influential articles from Cartographica Type de document : Monographie Auteurs : Martin Dodge, Éditeur scientifique Editeur : New York, Londres, Hoboken (New Jersey), ... : John Wiley & Sons Année de publication : 2011 Importance : 408 p. Format : 17 x 25 cm ISBN/ISSN/EAN : 978-0-470-68174-9 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] algorithme de Douglas-Peucker [Termes IGN] carte choroplèthe [Termes IGN] communication cartographique [Termes IGN] données spatiotemporelles [Termes IGN] modèle conceptuel de données localisées [Termes IGN] représentation cartographique [Termes IGN] SIG participatif [Termes IGN] signe conventionnel Résumé : (Editeur) The book provides an intellectually-driven reinterpretation of a selection of ten touchstone articles in the development of mapping scholarship over the last four decades. The ‘classics’ are drawn exclusively from the international peer-review journal Cartographica and are reprinted in full here. They are accompanied by newly commissioned reflective essays by the original article authors, and other eminent scholars, to provide fresh interpretation of the meaning of the ideas presented and their wider, lasting impact on cartographic research. The book provides an equal balance of influential articles from the past and current commentaries which highlight their impact and current context. Read in combination the original ‘classic’ articles and these new reflective essays demonstrate how cartography works as a powerful representational form and explores how various different aspects of mapping practice have been conceptualized by an influential set of academic researchers. - Collates ‘classic’ articles from four decades of the journal Cartographica. - Brings key articles up-to-date with contemporary interpretative essays by the leading scholars in mapping research. - Themes covered are the epistemological of mapping practice, the ontological underpinnings of cartographic representation, and the contested societal implications of maps. - Evaluates the progression of the field of cartographic research and demonstrates how new theoretical ideas originate, develop and circulate. - Provides a signpost for students and new researchers on the key articles in cartography to read and reflect upon. Note de contenu : 1. What are the ‘classic’ articles in cartography? (Martin Dodge) Section One: Epistemological Practice 2. Algorithms for the Reduction of the Number of Points Required to Represent a Digitized Line or its Caricature (1973) (David H. Douglas and Thomas K. Peucker) 3. Reflection Essay: Algorithms for the Reduction of the Number of Points Required to Represent a Digitized Line or its Caricature (Tom Poiker and David Douglas) 4. The Nature of Boundaries on ‘Area-Class’ Maps (1989) (David M. Mark and Ferenc Csillag) 5. Reflection Essay: The Nature of Boundaries on ‘Area-Class’ Maps (David M. Mark) 6. Strategies for the Visualization of Geographic Time-Series Data (1990) (Mark Monmonier) 7. Reflection Essay: Strategies for the Visualization of Geographic Time-Series Data (Mark Monmonier) 8. PPGIS in Community Development Planning: Framing the Organizational Context (2001) (Sarah Elwood and Rina Ghose) 9. Reflection Essay: PPGIS in Community Development Planning (Sarah Elwood and Rina Ghose) Section Two: Ontological Understanding. 10. Cartographic Communication and Geographic Understanding (1976) (Leonard Guelke) 11. Reflection Essay:Cartographic Communication and Geographic Understanding (Mordechai (Muki) Haklay and Catherine Emma (Kate) Jones) 12. A Conceptual Framework and Comparison of Spatial Data Models (1984) (Donna J. Peuquet) 13. Reflection Essay: A Conceptual Framework and Comparison of Spatial Data Models (Jeremy Mennis) 14. Designs on Signs: Myth and Meaning in Maps (1986) (Denis Wood and John Fels) 15. Reflection Essay: Designs on Signs/Myth and Meaning in Maps (Denis Wood and John Fels) Section Three: Politics and Society 16. Deconstructing the Map (1989) (J.B. Harley) 17. Reflection Essay: Deconstructing the Map (Jeremy W. Crampton) 18. Cartography Without ‘Progress’: Reinterpreting the Nature and Historical Development of Mapmaking (1993) (Matthew H. Edney) 19. Reflection Essay: Progress and the Nature of ‘Cartography’ (Jeremy W. Crampton), (Matthew H. Edney). 20. Between Demythologizing and Deconstructing the Map: Shawnadithit’s New-Found-Land and the Alienation of Canada (1995) (Matthew Sparke) 21. The Look of Surveillance Returns: Reflection Essay: Between Demythologizing and Deconstructing the Map (Matt Sparke) Numéro de notice : 20562 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Recueil / ouvrage collectif Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=41807

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A three-dimensional Douglas-Peucker algorithm and its application to automated generalization of DEMs / Fei Lifan in International journal of geographical information science IJGIS, vol 23 n° 6 (june 2009)  

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Length-preserving thinning algorithm for line extraction from land cover data / J. Choi in Cartographica, vol 43 n° 4 (December 2008)  

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Cartographic generalisation of lines based on a B-spline snake model / E. Guilbert in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)  

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A simplicial complex-based DBMS approach to 3D topographic data modelling / F. Penninga in International journal of geographical information science IJGIS, vol 22 n° 6-7 (june 2008)  

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A new model for cloud tracking and analysis on satellite images / E. Guilbert in Geoinformatica, vol 11 n° 3 (September - November 2007)  

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The drainage network extraction from contour lines for contour line generalization / Tinghua Ai in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 2 (June 2007)  

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Vers un fond vert commun IGN-IFN / Françoise de Blomac in SIG la lettre, n° 86 (avril 2007)

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Dynamic simplification and visualization of large maps / N. Mustafa in International journal of geographical information science IJGIS, vol 20 n° 3 (march 2006)  

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Conflict removal between B-spline curves for isobathymetric line generalization using a snake model / E. Guilbert in Cartography and Geographic Information Science, vol 33 n° 1 (January 2006)  

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Fourier series and the cartographic line / G.J. Lawford in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

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