International audienceDue to the dual impact of systems interoperability and changes in the legal framework, institutional spatial data tends to become more and more accessible through widespread deployment of spatial data infrastructures (SDI). Comparative analysis of the content of three national SDI (France, Bolivia, Brazil) reveals a few tendancies. This contribution's originality lies in using SDI not as an aid to research but as a true object of study. Metadata analysis of three national catalogs offers a way to reconsider the logics of both formalisation and knowledge diffusion through territories.Par le double effet de l'interopérabilité des systèmes et de l'évolution du cadre légal, les patrimoines de données géographiques institut...