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