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Web GIS is the implementation of geographic information systems (GIS) functionality through a World Wide Web browser or other client program, thus allowing a broader usage and analysis of a particular geographic database. Also referred to as Internet GIS, distributed GIS, and Internet mapping, the implementation of online GIS systems has dominated the work of GIS professionals since the late 1990s.

Examples of Web GIS have proliferated. Online map-based property information systems developed by local governments are early and important examples that demonstrate the clear benefit of this technology. Such systems can be used to compare tax assessments between properties and are viewed as vital tools in promoting fairness in taxation and a democratic society. Web GIS is a central element in public participation GIS (PPGIS) ...

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