1. F. Grasso, Veronica, Early Warning Systems: State-of-Art Analysis and Future Directions, United Nations Environment Programme, http://na.unep.net/geas/docs/Early Warning System Report.pdf.
2. Inspire Directive, http://inspire.jrc.ec.europa.eu/.
3. The global earth observation system of systems: Science serving society;Lautenbacher;Space Policy,2006
4. Shared environmental information system, http://ec.europa.eu/environment/seis/.
5. Urbanflood project home page, http://www.urbanflood.eu.