Contribution à la cartographie d’une matrice de flux

Abstract : We consider a flow matrice where the (1,…,i ,… k) rows and the (1, …,j ,…, p) columns are respectively origin and destination place linked by a flow values (Fij). Mapping flow aims to project values on a map depicting generally a geographic space, using linear and punctual features. When the matrice is dense, this well known approach leads theoretical and methodological difficulties, graphics constraints, technical and technological challenges that must be addressed in order to solve the graphic complexity that appears: the so-called spaghetti effect. The traditional answer is to simplify the figure by selecting flows and or by reducing their resolution. If the result is really effective, it does not interest the flow mapping cartographic process. What are the reasons? Does this mean that solutions to flow mapping problems are only relate to digital or cartographic data? What is really the meaning of flow mapping? This thesis is part of the overall objective of reducing analytic and graphical complexity of flow mapping. Consisting of nine chapters divided into two parts, it offers four families of theoretical and methodological contributions. The first part is to familiarize ourselves with the construction of matrices, their (carto)graphic presentation and constraints that result. The second part offers a range of non-exhaustive and operational solutions to solve a variety of problems related to reduce the analytical and visual complexity of flow mapping. The approach wanting general and generalizable, the proposed solutions are validated empirically on migration or trade flow matrices that are expressed at different geographical scales (from local to global).
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Submitted on : Saturday, February 13, 2016 - 4:35:51 PM
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  • HAL Id : tel-01273776, version 1

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Françoise Bahoken. Contribution à la cartographie d’une matrice de flux. Géographie. Université Paris Diderot (Paris 7), 2016. Français. ⟨tel-01273776⟩

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