Research And Practice On The Issues Of Vector Data Editing In CoGIS

GIS emerged as the times require, as the computer came out, and the geography data is the blood of GIS, is the foundation of each function in GIS. The production of vector data take a very important role not only in cartography, but also in GIS field. So, the vector data editing is a important tache in data production. However, the vector data editing nowadays remains in the phase of handworked workshop by single person and single computer, there is no real time communion and cooperation among the workers, this work mode has some disadvantage, which results in that the production,renewal and maintenance of vector data has long periods,low efficiency. The application in GIS field of the theory of Computer Support Cooperative Work(CSCW),which is bringed forward in the middle of 1980s, provides a chance to solve the problems in the the vector data editing.This thesis analyses the actuality of vector data editing, and based on it, researchs and probes into the problems in vector data cooperative editing, using the theory and technique in CSCW and cooperative GIS. Main contents are as follows:1. From the analysis of traditional vector data editing model, it brings forward vector data cooperative editing model based on recursion task tree and data centralized-management.2. It is unavoidable that the problem of operation conflict which happens in multi-users editing. Considering the fact of vector data editing work, this thesis uses the strategy of intercurrent control based on version control technology of task tree and entity-oriented multi-level lock.3. Considering the some problems, such as system security and data consistency maintenance, adopt role-based multi-users control.4. For increasing system compatibility on vector data, enhancing practicability and applicability of system, and prolonging system lifecycle, this thesis brings forward script-based method of vector data integration.5. Based on all above theories, vector data cooperative editing system is established for multi-users cooperative work, that uses interface-oriented system design method, and the design of key component and the realization of system function is introduced.