The National Geographic Institute of Spain (IGN) is creating, or as of the time of this writing has created, a database to show land cover and usage. (http://www.isprs.org/proceedings/XXXVII/congress/8_pdf/11_WG-VIII-11/28.pdf )
They are making this database to integrate different regional and national geography information into one cohesive database. This system will be utilized not only by Spain but all of Europe. To model the database they have chosen the OODM(Object-Oriented Data Model) A full image of this OODM is available at the above link.
Spain, N. G. (n.d.). SIOSE, A SUCCESSFUL TEST BENCH TOWARDS HARMONIZATION AND INTEGRATION OF LAND COVER /USE INFORMATION AS ENVIRONMENTAL REFERENCE DATA. Retrieved from www.ISPRS.org: http://www.isprs.org/proceedings/XXXVII/congress/8_pdf/11_WG-VIII-11/28.pdf
