The Research On The Coding Of Fundamental Geographic Data Sharing And Exchange Based On Association Patterns

With the widely application of GIS in daily life, fundamental geographic data has become an important part of urban construction and development. Government administrations, scientific research and the public have strong requirement on data sharing. To some extent, the share of fundamental geographic data has already become the tendency of geographical information development. However, there are many problems in fundamental geographic data sharing and exchange, especially that data among industries can't be exchanged efficiently, which caused the "Information Isolated Island". It will make the shared fundamental geographic data more valuable if we can exchange the different industries'data efficiently and timely without changing the existing professional data standards, which can greatly promote the development of construction in fundamental geographic data sharing.Based on the research of shared fundamental geographic database, this paper analyzed the characteristics of shared fundamental geographic data, and refined the interrelated feature between those shared data. On this basis, cognitive and discover the association patterns from the shared fundamental geographic database, design the fundamental geographic data sharing and exchange coding, develop the encoding processor by adopt COM and middleware technique, achieve sharing and exchange coding generation, analysis and interchange, ultimately establish the foundation for fundamental geographic data sharing and exchange.The main constructions of this paper are as follows:(1) This paper summarizes the interconnection between shared fundamental geographic data, concludes the categories of association patterns and the characteristics of each category. Combining the characteristics of associated object, this paper reveals the interconnection that hidden in the shared data visually by structure-expression of the association patterns, making it easier to identify in the public and computer.(2) This paper discoveries the association patterns from the shared fundamental geographic database. According to the characteristics of association patterns, combined with the semantic database, predicates database, relationship calculation function and association pattern discovery algorithm to discover and store the association patterns in the shared database. (3) This paper establishes the coding standard of fundamental geographic data sharing and exchange. In view of the current existed matters about diversity in the coding and inconvenient to identify and manage issues, summarizes the commonness of industries'fundamental geographic data coding. According to the goal of sharing and exchange, establishes the coding standard of fundamental geographic data sharing and exchange by combining the association patterns.(4) Through the encoding processor of fundamental geographic data sharing and exchange, the fundamental geographic data among different industries'can be exchanged freely. Based on the coding standard of data sharing and exchange, this paper develops the encoding processor, takes the fundamental geographic data sharing and exchange between mapping and housing industry as an example, verifying the feasibility of this study.