International audienceBeyond their original function of base maps diffusion, spatial data infrastructure (SDI) are progressively set up in order to organize thematic data coproduction. Spatial data production in a multi-actor context is a collaborative process in a decisional perspective. That's why the issues are multiple. This paper suggests some elements of reflexion for the design and implementation of concertation and participatory decision process for spatial data production. Finally, a focus on traditional participatory process will be discussed to find an alternative way: beyond consensus or compromise, argumentative consensus.Au-delà de leurs objectifs initiaux d'échange ou de diffusion de référentiels cartographiques, les plates-f...