– Geographic information systems (GIS) published on the web are called WebGIS. A WebGIS is thus the extension to the web application created and developed to manage numeric cartography. A WebGIS project is distinguished from a GIS project for the specific purposes of communication and information sharing with other users.
– The information, which are territorial, geographic or socio-economic, have had paper as the main support in the past: the amount of data and the impossibility of their overlap at the end of analysis, has made this support obsolete for a series of operations such as monitoring or the territorial administration.
– Information systems arise from the need to collect, process, manage, provide all the responsible decision-makers with a large amount of data and information relating to the territory. The practical impossibility of representing the world over, the superfluity and the pointlessness of certain data, lead to the formation of a conceptual model of reality that simulates, in a synthetic way, the real world: precisely on this model, based only on information accessible and relevant to the goal, will the analysis and decisions be made.