Study On Co-Edit Of Geographical Features

In recent years, with the rapid development of Computer Supported Cooperative Work and e-government, spatial data and spatial information technology have been widely applied in the fields of management in governmental administrative departments. The society is striding forward to times of collaboration. The older mode in which one task is assigned to one person can no longer meet the demand of society's development. Collaboration becomes the trend of development of E-government. GIS is the base flat of spatial orientation of E-government, so it needs to develop into CoGIS to make E-government grow better.Apart from the basic functions of GIS, CoGIS has to support multiple users' cooperation in the collaborative environment. Division and Cooperation of a task can be realized in CoGIS. Concurrence, consistency and fast-response are the features of CoGIS. In CoGIS Synchronization are executed to multi-users' operations to avoid conflicts, and to ensure that the results of multi-user are consistent. Because of complexity of spatial structure and limitations of technology, GIS software has not achieved cooperative work; especially the issues of Co-Edit of geographical feature have not been solved.This paper aims at the demand for development of Cooperative GIS and the shortage of today's GIS software. Through the study on Co-Edit of geographical features, the strategy for coordinated editing GIS data in the collaborative environment is analyzed. The study makes it possible for multiple users to edit one graphical feature. The researches of this paper are described below:(1) Research the architecture which supports collaborative edit of spatial data, take message-based synchronized technology to transfer users' operations, and realize synchronous cooperative work.(2) Classify GIS operations according to the types of features and the results of the GIS operations, then design a matrix to judge if two operations are conflicting. The method to detect conflicts by the matrix of conflict is to be present. The mechanism to remove conflicts is to be discussed.(3) The ways to merge the results of Co-users' operations and to upgrade merged results into spatial database are to be given.This study breaks through the limitations of Co-Edit in the current GIS software, and provides a way to promote the development of CoGIS. It is of great significance in the promotion of GIS framework and a new collaborative GIS.