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The Developing Outlook of the Geographic Information Systems

Zhai Yi(Zhengzhou Institute of Surveying and Mapping, Zhengzhou, 450052)  
?This paper discusses some cruxes about geographic information systems from three aspects: GIS's data acquisitions and renewal, distributed computing of GIS software and data exchange. and the 3-D or 4-D expressions of geographic information,and forecasts the market, apply and outlook of GIS.
【CateGory Index】: P208
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