In France, farms do not own all their land and largely lease them (61,7% in 2010, Courleux, 2011). Even if that situation is extreme in Europe (situation shared with Germany and Belgium), the rate of leased Utilized Agricultural Area (UAA) under the total UAA does not fall under 30% in this world region (Eurostat, 2013). Consequently, "who owns farmland ?" is a crucial question because: 1) a great part of farming is done under lease arrangements; 2) answering it might shed light on a lot of current issues for rural development (farmers retirement, farms enlargement, urban development, land grabbing...). There is a lack of knowledge in literature on this topic, probably due to the scarcity of available data. In France for example, the General Agricole Census which is made each decade, not allows to understand how is compounded property, how rights are distributed among owners, who are they, and how the different ownership types meet the different types of farms, agricultural productions, farming systems... Our proposition rests upon the principle of intersecting individual and spatialized data about owners (land taxation data) and about users (Common Agricultural Policy). That first test aims at overcoming technical GIS constraints and those related to data protection laws, at delimiting the limits of the method, and at establishing the analysis potential within the given constraints. We then apply the method on the Auvergne Region to illustrate the diagnosis elements it provides on the farmland property-use relationship.