Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Multimedia in ecology Multimedia Systems 751-766 2016 fdi:010068289 ENG Multimedia Systems 0942-4962 ISI:000386371600009 6 (no spécial) 10.1007/s00530-015-0462-9 https://www.documentation.ird.fr/hor/fdi:010068289 https://www.documentation.ird.fr/intranet/publi/2016/11/010068289.pdf 22 Horizon (IRD) Pl@ntNet is an innovative participatory sensing platform relying on image-based plants identification as a mean to enlist non-expert contributors and facilitate the production of botanical observation data. One year after the public launch of the mobile application, we carry out a self-critical evaluation of the experience with regard to the requirements of a sustainable and effective ecological surveillance tool. We first demonstrate the attractiveness of the developed multimedia system (with more than 90K end-users) and the nice self-improving capacities of the whole collaborative workflow. We then point out the current limitations of the approach towards producing timely and accurate distribution maps of plants at a very large scale. We discuss in particular two main issues: the bias and the incompleteness of the produced data. We finally open new perspectives and describe upcoming realizations towards bridging these gaps. 122 ; 076 UR123