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FOUR-D PRODUCTS AND THE APPLICATION OF GEOGRAPHIC INFORMATION SYSTEM

YIN Nian ( Academy of Surveying and Mapping of Hefei City, Hefei 230001, China )  
This paper introduces the fundamental conceptions of 4D products (referring to Digital Orthophoto Map, Digital Elevation Model, Digital Raster Graphic and Digital Line Graphic) as well as their data collection and computer expression, and also involves the relation of 4D products with GIS and their application.
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