Report available from JRC
Eleven regional/sub-national SDIs in Europe are presented in the report: Lombardy, and Piedmont (Italy), Catalonia and Navarra (Spain), Wallonia and Flanders (Belgium), North-Rhine Westfalia and Bavaria (Germany), Northern Ireland (UK), Brittany (France), and Vysocina (Czech Republic). These experiences are set in the context of the broader European framework provided by the INSPIRE Directive, the national State of Play studies, and international experiences in the USA and Australia.
One of the main findings: The technology is cheap, data is expensive, but social relations are invaluable.
Details can be found in the report edited by M. Craglia and M. Campagna, European Commission Joint Research Centre, Institute for Environment and Sustainability.