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Geographic Information System (GIS) has long been essential tool for governments, environmental institutions, military and others who depend on geographic information. GIS combines layers of data about a location to create a fuller and more accurate picture of that location. These data are obtained from different sources in different formats, datum and coordinate systems. The problem of traditional GIS is to gather all up-to-date data and to process them in the same format and datum. The Internet has changed rapidly the transfer and dissemination of geographical information. This rapid and enormous development of the Internet technology resulted in usage of the Internet as a tool for data access, data transmission and access to GIS analysis tools.
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