"A spatial data infrastructure is a system of (political) measures, institutional facilities, technologies, data and people that enable the joint exchange and efficient use of geographical information."

• The aim of a spatial data infrastructure (SDI) is to provide users with direct access to geoinformation and geoservices from various providers.
• GDIs exist at various levels. Countries, municipalities, cities, etc. can set up GDIs. At European level, we find INSPIRE as the EU's spatial data infrastructure.
• Users are administrative bodies at all levels, experts from the fields of surveying, planning, construction, the environment and the public

80 percent of all political and economic decisions have a spatial reference.