Rocky risk is a major challenge in the Alps, threatening critical infrastructure and urbanised areas. The sectors most sensitive to this risk have been subject to specific protection of the civil engineering type. In other sectors, forest management has so far been able to maintain the forest and thus limit the consequences of this hazard. But it must be noted that forest management in the mountains is declining. In order to avoid the catastrophic consequences of the alteration or even the loss of forest cover, it is necessary above all to be able to locate the forest sectors which have a protective role, which requires a cartographic zoning of this service provided by forest ecosystems and the search for compromises in the management of the forest areas concerned between 1) adaptation to climate change and the sustainable prevention of risks and 2) in case of multifunctionality of these. The aim of the GROG project is therefore to mobilise the latest scientific knowledge acquired at the level of the Alpine arch in order to build, calibrate, test and operationally deploy, in partnership with all the stakeholders concerned, a statistical model for the mapping of rock hazards and forests with a function of protection against rocky risk. All the maps produced will be used to develop the forestry component of the GIRN of the Grenoble-Alpes metropolis.