From image to decision making... Contribution of remote sensing and geographic information systems to management of terrestrial biodiversity: Case study of invasive plants management

Lagabrielle Erwann. 2004. From image to decision making... Contribution of remote sensing and geographic information systems to management of terrestrial biodiversity: Case study of invasive plants management. In : Proceedings of a Workshop on biodiversity dynamics on la Réunion Island, Saint Pierre - Saint Denis, 29 November - 5 December 2004 = Atelier sur la dynamique de la biodiversité à la Réunion. Saint Pierre - Saint Denis, 29 novembre- 5 décembre 2004. Baret Stéphane (ed.), Rouget Mathieu (ed.), Nänni Ingrid (ed.), Le Bourgeois Thomas (ed.). Université de la Réunion, CIRAD. Saint-Denis : Université de la Réunion, p. 45. Atelier sur la dynamique de la biodiversité à la Réunion, Saint-Pierre, Réunion, 29 November 2004/5 December 2004.

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Abstract : La Réunion is a French tropical island located in the Indian Ocean. This island is confronted with strong threats on terrestrial biodiversity: invasive plants, extension of urban fringes, habitat fragmentation, extension of agriculture areas (mainly pasturage and sugar cane). Good governance of biodiversity rests with collective decision making of stakeholders on a territory. In this framework, it's necessary to gather scales of ecological/geographical phenomena and organisation levels in an encapsulated management policy (from global to local). Ideally, an integrated management of biodiversity should be based on a systematic approach of biodiversity described in a social and economical environment (i. e. geodiversity). Through both geographical and ecological approaches, this work affiliated to research institutes (Cirad, IRD, CNES) tries to understand the interactions between invasive alien plants and other geographical components. The main objective of this work is to provide a helpful tool for decision makers in order to adapt conservation planning policy. How to integrate spatial complexity of the geodiversity within a conservation planning? How to target conservation effort? How to link data and knowledge bases in relation with invasive plants, landscapes and land uses? Which methods and wich tools must be improved in order to mine and to update the informations provided by spatial imagery? How to optimize connectivity between GIS and remote sensing technologies? Firstly, biodiversity conservation and invasive plants managing involve to identify needs of decision makers. Then, the design of a decision making tool based on a Geographic Information System feeded by informations extracted from satellite imagery can be done. At least, our objective is to integrate this tool for decision making in a Systematic Conservation Planning. High improvements of GIS and remote sensing technologies provide Very High Spatial Resolution data (for exemple, Spot 5: 2.5 m). This remote sensing datas intails new geostatistical approaches based on object's shapes, texture and structure of these images: object oriented classification, data mining (mining of informations from numerous and complex datasets), expert classification. Our aim is to analyse the relationship among scales and geographical components of the environment (biogeography, urbanization, landuse dynamic, etc...) focusing on invasive plants management. Then, we will estimate the interest of each type of spatial image (Spot 5, Quick Bird, etc.) in relation with the component studied and the classification algorithms used. In a second way, we will try to define an evaluation matrix in order to prioritize conservation areas. The matrix will include parameters such as: invasive plants, landuse, landscape... This matrix is the base of the implementation of a spatialized model feeding by internal and external geographic informations. The final goal is to target the conservation effort on sensible areas. Our modelling will focus on sensible areas threatened by invasive plants. (Texte intégral)

Mots-clés Agrovoc : Plante nuisible, Mauvaise herbe, Télédétection, Système d'information géographique, Biodiversité, Conservation de la nature, Aide à la décision, Imagerie, Satellite, Utilisation des terres, Terre agricole, Distribution spatiale, Traitement de l'information, Espèce envahissante

Mots-clés géographiques Agrovoc : Réunion

Classification Agris : U30 - Research methods
P01 - Nature conservation and land resources

Auteurs et affiliations

  • Lagabrielle Erwann, CIRAD-TERA-REV (REU)

Autres liens de la publication

Source : Cirad - Agritrop (

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