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Contribution des technologies satellitaires Pléiades à l'étude des trames vertes urbaines : entre maintien des connectivités écologiques potentielles et densification des espaces urbains

Abstract : In urban areas, competition between land development and ecological conservation is intense. To assist decision making, a better knowledge of those areas of interest is required. Regarding inadequacy data and methods needed for ecological network mapping in urban areas, the aim of our study is to develop a method for semi-automatic vegetation extraction with Very High Spatial Resolution Pleiades imagery (VHSR). Initially applied to training samples, the process is then be deployed to four French study areas (Toulouse, Muret, Pierrefite-Nestalas and Strasbourg). The reproducibility of this method over large urbanized areas is ensured by its simplicity and the results of a pixel-based classification (kappa coefficient higher than 85 %). This extraction workflow uses free or open-source software. This vegetation data is then used in order to model potential ecological connectivity in Toulouse’s urban and peri-urban areas. Impacts on biodiversity due to urban planning are assessed using graph theory. The “Boulevard Urbain Nord de Toulouse” project, a road infrastructure, is studied. Graph metrics have been calculated to assess the level of connectivity at habitat patches and landscape scales. We classified the importance of the patches which is cross-tabulated with planning documents (PLU, a local town planning) in order to locate conflict urban areas: between biodiversity preservation and urbanization. Depending on the issues set out by local actors and through the application filter, this thesis proposes a robust analytical tool and decision-making aid for landscape management and land planning.
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https://tel.archives-ouvertes.fr/tel-01503506
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Submitted on : Wednesday, April 12, 2017 - 3:25:12 PM
Last modification on : Wednesday, May 23, 2018 - 5:58:08 PM

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  • HAL Id : tel-01503506, version 2

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Pauline Crombette. Contribution des technologies satellitaires Pléiades à l'étude des trames vertes urbaines : entre maintien des connectivités écologiques potentielles et densification des espaces urbains. Géographie. Université Toulouse le Mirail - Toulouse II, 2016. Français. ⟨NNT : 2016TOU20032⟩. ⟨tel-01503506v2⟩

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