Anticipating unbalances and threats within a territory most often lies in an ensemble of indicators. A sometimes basic system of information provides the decisionmakers with warnings. Yet, a number of risks, either rapid deflagration ones or from quite scattered origins, cannot rely on a symptomatic treatment only but requests collecting from multiple sources beforehand and aiming at a semiological treatment of information evolution. Part of our study on territorial intelligence leads us to think that the processes of anticipation of outbreaks within the territory will tend to be based on collecting methodologies encompassing the participation of 'ordinary individual'. Two observations on air surveillance on the one hand and on biodiversity seasonal evolutions in France on the other show these new enterprises and collective methods of mutualisation of information within the territory in an actors-oriented paradigm.