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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]

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