sentences:  Large scale networks of geosensors have been in place for many years, measuring Earth surface, hydrological and atmospheric phenomena.The advent of the Internet led to a large expansion of such networks, and efforts like Global Earth Observation System of Systems (GEOSS) Initiative aim to connect them.The term Volunteered Geographic Information was coined in 2007 by geographer Michael Goodchild, referring to the rapidly growing volume of social and scientific georeferenced user-generated content being made available on the Web by both expert and non-expert individuals and groups.