If you want to see a real world example of freely available, exact and digital government land/building registry (including ownerships etc!), you can look at th

If you want to see a real world example of freely available, exact and digital government land/building registry (including ownerships etc!), you can look at the Czech "Cadastre of Immovables": https://www.ikatastr.cz/ https://www.ikatastr.cz/ (zoom to street level to see plots). It covers every centimeter of the country.