Geographical information systems (GIS) are often used as visualization and analytical means for utility networks applications, because they enable to store information on geographical objects together with their topological and geographical relations. They handle large amounts of geographical data and provide spatial query evaluation on this data. The computationally expensive spatial queries may be improved thanks to the development of on-line analytical processing systems (OLAP) speeding-up the analysis of huge amounts of data stored in large databases. An integration of data warehouse and GIS technologies is the way to enable on-line analysis of geographical information and present its results in geographical contents by native means of the GIS system.
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