Some concluding thoughtsc  
nNSDI provides an overarching framework that allows for interoperability of geographic datasets.
nEstablishment of NSDI in respective countries is vital for growth and development.
nThe development of NSDI is spreading across the globe especially in developed countries but similar initiatives are taking place among the developing nations.
nEach country which embarked on NSDI development has its own rationale, legal basis, key features and experience to share such that others which are just underway have something to emulate.