The rapid development of IT technologies observed in recent years has pro-vided citizens with easier access to public information on the Internet. Information and the ability to process it ensures success in making decisions concerning vari-ous areas.
The basis of the spatial information infrastructure constructed in Poland is inter-operability, i.e. the possibility of combining sets of existing spatial data which are maintained by various subjects. This paper presents the importance of cadastre data in the created spatial information infrastructure.