Design And Implementation Of DigMap Spatial Data Interface

With China's social development and maturation of GIS technology,people put forward higher requirements to GIS application system,not only having a powerful analytical functions,but also being able to minimize the cost of building GIS application system and can be update geodatabase timely and effective,implementing different spatial data conversion, etc.And,this is also the bottleneck of domestic GIS platform development.In response to the realities,this article research on the present GIS data interface implementation technology to DigMap whitch being self-developed GIS foundmental platform by CHEN Zheng-jiang-led team as an example.In this paper,first of all,detailed the spatial data model of DigMap,analysised the vector database of the logic of the organizational structure of GMP,and done a comparative study with the current mainstream GIS software,such as ArcGIS,MapInfo's data model and data organization,cleared the the main problem in their implementation of the data interface between them.Then,designed the graphics information and topological information extraction algorithm by Mif/Mid,Shapefile document analysis of the organizational structure, and,described the graphic effects on the control issues and so on.And then,through the needs analysis of DigMap platform,cleared the important principle to be followed to implement the data interface,designed the overall structure of the DigMap's spatial data interface implementation through the mainstream of the current development model of the data interface of the application of analysis.Then,use the object-oriented computer procedures developement approach,developed the Mif/Mid data,Shapfile documents into the database Gmp data conversion module using VB and C++ programming language, achieved the DigMap platform with the ArcGIS platform,Maplnfo platform spatial data interface.Final,through the experimental example,verified the correctness of the data conversion module,high efficiency,from the graphical results,topology information extraction,display nodes,the program efficiency.Also demonstrated the usefulness of the GIS platform DigMap. The implementation of DigMap's data interface,not only optimize its function structure, but also explore the technology of interface implementation.And,the key technology of node-arc model topological relations and spatial entities + spatial index model of topological relations of two types of spatial data conversion algorithm provides a reference for other platforms interface development.