Plan4all is an EU project that aims to harmonize spatial planning data across countries according to INSPIRE directives. It involves 24 partners from 14 EU countries working to develop metadata profiles, data models, and a networking architecture to allow seamless access and sharing of spatial planning data themes like land use and natural risk zones. The project will validate these tools and establish a geoportal to deploy harmonized data. The overall goal is to facilitate cross-border collaboration on spatial planning issues through interoperable data standards.