Zone de Texte: A REVIEW ON GEOMATIC TOOLS FOR ASSESSING, INVENTORYING AND MAPPING ALIEN PLANT INVASIONS IN THE MEDITERRANEAN BASIN Zone de Texte: Data Collection Tools - Remote Sensing Zone de Texte: Direct detection (Limits) Replication of successfull detections (most paper deal with a limited number of datasets, there are few results – if any – on large multitemporal datasets); Patchiness of Mediterranean landscape; Transfer of the methodology to different study areas (the knowlegde of local conditions, the necessity of (radiometric) field campaigns for collecting data truth severely limits the possibility of a direct transfer of detection methodologies between different study areas and species); Understory alien plants (Joshi et al., 2004); Multi-species alien communities (mixed signatures); Taxonomic validation of data (taxonomic references are usually lacking in many r.s. papers, that are often not peer-reviewed from this point of view); Cost of the technology, know-how (reducing but still significant) especially for high-temporal-radiometric resolution data.

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