Data Integration Technology Research And Realization In Ocean And Land Combined GIS

The 21st century is the ocean century, along with the ocean development and in order to satisfy coastal economy need, there were born the need of ocean and land union geographic information system. The system not only provide the foundation to coastal city ocean development, the urban development, the plan decision-making information strut platform and the space orientation, but also serve the coastal military strategy and the defense. Key problem must be solved in the union GIS is how to integrate chart and map information.Map integration technique is essential information sharing method, this paper research the technique mostly about spacial information between different GIS, include following aspects, different origin spacial data unification data model establishment, spacial data under different projection way unification storage model , the ocean and land union GIS unification attribute code system establishment as well as the feature uniform question of the same name.These questions solutions not only lay the technology foundation for established ocean and land union GIS , but also provided solution for realization space data sharing, the expanded space data use scope, the reduced space data maintenance and the gain expense.Finally, on the basis of practical chart data and map data, the paper finished the integration display on the union GIS. I wish the work here is beneficial to GIS further development.