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2. Google seach globe. http://data-arts.appspot.com/globe-search/ . Accessed 08 Aug 2015
3. The new york city community air survey. http://www.nyc.gov/html/doh/downloads/pdf/eode/comm-air-survey-report.pdf . Accessed 08 Aug 2015
4. Precision Agriculture in the 21st Century (1997) Geospatial and information technologies in crop management. The National Academies Press, Washington, DC. http://www.nap.edu/catalog/5491/precision-agriculture-in-the-21st-century-geospatial-and-information-technologies
5. Department of transportation: connected vehicle technology challenge (2011). http://goo.gl/fP8nd