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Development of 3DGIS technology

SHI Jia-song,LIU Jian-zhong(Institute of Surveying and Mapping,Information Engineering University,Henan Zhengzhou 450052,China)  
This paper makes a detailed review of the current development of 3D GIS,discusses some technology development such as 3D spatial data acquisition,3D data model and data structure,3D data storage,manage and query,3D spatial analysis and three dimensional visualization and real-time display,and then points out that 3D GIS's development is restricted by difficulties of 3D data acquisition,inefficient 3D data model and data structure,large amount 3D procession and storage and 3D spatial analysis.At last,four hot points about 3D GIS research are presented in this paper:①Data requirement in 3D GIS becomes more and more important,research on multiple data sources integration requirement has been research focus;②Present model could only express regular 3D entities,and it's difficult to express complex 3D entities,research on multiple data models integration or hybrid will be a kind of research direction on 3D modeling;③The spatial analysis of 3D model is an important content of 3D GIS,research on a kind of object-oriented data model and data structure to support efficient 3D spatial analysis can meet the updated requirement of the GIS field;④3D city modeling is an important aspect of 3D GIS research and development,the main research works focus on 3D data and texture capture,as well as objects reconstruction based on images.
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