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Visualisation of origins, destinations and flows with OD maps / J. Wood in Cartographic journal (the), vol 47 n° 2 (May 2010)  

Public [article]  inCartographic journal (the) > vol 47 n° 2 (May 2010) . - pp 117 - 129 Titre : Visualisation of origins, destinations and flows with OD maps Type de document : Article/Communication Auteurs : J. Wood, Auteur ; A. Slingsby, Auteur ; Jason Dykes, Auteur Année de publication : 2010 Article en page(s) : pp 117 - 129 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] arc [Termes IGN] cartographie des flux [Termes IGN] cartographie dynamique [Termes IGN] généralisation cartographique automatisée [Termes IGN] matrice [Termes IGN] migration humaine [Termes IGN] trajectographie (positionnement) [Termes IGN] visualisation cartographique [Termes IGN] visualisation de données Résumé : (Auteur) We present a new technique for the visual exploration of origins (O) and destinations (D) arranged in geographic space. Previous attempts to map the flows between origins and destinations have suffered from problems of occlusion usually requiring some form of generalisation, such as aggregation or flow density estimation before they can be visualized. This can lead to loss of detail or the introduction of arbitrary artefacts in the visual representation. Here, we propose mapping OD vectors as cells rather than lines, comparable with the process of constructing OD matrices, but unlike the OD matrix, we preserve the spatial layout of all origin and destination locations by constructing a gridded two-level spatial treemap. The result is a set of spatially ordered small multiples upon which any arbitrary geographic data may be projected. Using a hash grid spatial data structure, we explore the characteristics of the technique through a software prototype that allows interactive query and visualisation of 105-106 simulated and recorded OD vectors. The technique is illustrated using US county to county migration and commuting statistics. Copyright British Cartographic Society Numéro de notice : A2010-258 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870410X12658023467367 Date de publication en ligne : 18/07/2013 En ligne : https://doi.org/10.1179/000870410X12658023467367 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30452 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Scree representation on topographic maps / Bernhard Jenny in Cartographic journal (the), vol 47 n° 2 (May 2010)  

Public [article]  inCartographic journal (the) > vol 47 n° 2 (May 2010) . - pp 141 - 149 Titre : Scree representation on topographic maps Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; Lorenz Hurni, Auteur ; E. Hutzler, Auteur Année de publication : 2010 Article en page(s) : pp 141 - 149 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] carte topographique [Termes IGN] dessin assisté par ordinateur [Termes IGN] éboulis [Termes IGN] figuré du terrain [Termes IGN] montagne [Termes IGN] représentation du relief Résumé : (Auteur) Scree patterns are an important element of mountain maps in Swiss style. The size and density of scree dots vary with the exposition towards a source of illumination, which makes the dots extremely labour intensive to map without specialized algorithms. This paper identifies design principles for the symbolisation of scree fields on mountain slopes and presents a digital method for the quick placement of dot symbols requiring only minimal interventions by a cartographer. When digitally produced scree is combined with a shaded relief and a rock drawing, the terrain appears as a continuous three-dimensional surface to the reader. The described method is implemented in Scree Painter, a specialized free open-source software application. Scree patterns produced with Scree Painter match the quality standards of manually generated scree representations. Copyright British Cartographic Society Numéro de notice : A2010-259 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870410X12658023467367 Date de publication en ligne : 18/07/2013 En ligne : https://doi.org/10.1179/000870410X12658023467367 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30453 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Obtaining high fidelity triangular Regular Network from only DEM points / T. Gökgöz in Cartographic journal (the), vol 47 n° 2 (May 2010)  

Public [article]  inCartographic journal (the) > vol 47 n° 2 (May 2010) . - pp 150 - 156 Titre : Obtaining high fidelity triangular Regular Network from only DEM points Type de document : Article/Communication Auteurs : T. Gökgöz, Auteur Année de publication : 2010 Article en page(s) : pp 150 - 156 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] contour [Termes IGN] interpolation [Termes IGN] modèle numérique de surface [Termes IGN] pente [Termes IGN] tessellation [Termes IGN] Triangular Regular Network [Termes IGN] triangulation (topologie) Résumé : (Auteur) When the source data for the digital elevation model (DEM) are not known and any additional information or features such as skeleton lines of terrain is not available, a triangular regular network (TRN) is constructed with simple subdivision using one or two diagonals uniformly. Such a model gives inaccurate directions for interpolation because of the inaccurate diagonals used in triangulation and thereby, results in inaccurate contours representing artificial terrain features. In this study, a new method is developed based on slope information computed at DEM points determining accurate diagonals in the subdivision process, which is beneficial not only through the skeleton lines of a terrain but also all over the DEM. Consequently, it is shown that the proposed method is able to build a high fidelity TRN from a DEM without any additional information or features. Copyright British Cartographic Society Numéro de notice : A2010-260 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870409X12584524219009 Date de publication en ligne : 18/07/2013 En ligne : https://doi.org/10.1179/000870409X12584524219009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30454 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Triangulation method for area-line geometry-type changes in map generalisation / H. Selvi in Cartographic journal (the), vol 47 n° 2 (May 2010)  

Public [article]  inCartographic journal (the) > vol 47 n° 2 (May 2010) . - pp 157 - 163 Titre : Triangulation method for area-line geometry-type changes in map generalisation Type de document : Article/Communication Auteurs : H. Selvi, Auteur ; O. Bildirici, Auteur ; M. Yerci, Auteur Année de publication : 2010 Article en page(s) : pp 157 - 163 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] axe médian [Termes IGN] données vectorielles [Termes IGN] généralisation cartographique automatisée [Termes IGN] modèle topologique spaghetti [Termes IGN] système d'information géographique [Termes IGN] triangulation de Delaunay [Termes IGN] Visual Basic [Vedettes matières IGN] Généralisation Résumé : (Auteur) Changes in object geometry-type such as area to line are necessary in terms of the requirements of cartographic generalisation, and also for the creation of the network topology in geographical information systems. Geometry-type changes that reduce dimension include area-line, area-point and line-point changes. This study focuses on area-line changes. Since the area objects have different shapes, there is no unique solution that works in all possible situations. Well-known methods for area-line changes include triangulation, water lining, straight skeletons, etc. In this paper, an approach based on triangulation is introduced for creating road centerlines from blocks of parcels. Spaghetti large-scale map data are taken into consideration in this approach in which blocks of parcels are captured as polygons and roads are represented by the space between them. In order to implement this approach, a subprogram (script) is developed under the NETCAD software package - a Turkish CAD-GIS software package - with the Visual Basic scripting language. This subprogram also includes post-processing routines for the relevant node creation at road crossings, and delivers acceptable results for the centerlines; however, the post-processing needs to be improved. Numéro de notice : A2010-261 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870409X12584524218965 Date de publication en ligne : 18/07/2013 En ligne : https://doi.org/10.1179/000870409X12584524218965 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30455 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible