为了有效降低网络传输量以满足GIS实时协作的要求,针对地理空间数据量大的特点,通过对协作者的GIS操作进行抽象与封装,提出利用消息传递机制构建实时协同GIS系统的解决方案。首先分析了基于消息传递的实时协同GIS的实现机制,给出了系统体系结构;重点讨论了GIS操作的划分粒度与基于XML的GIS命令消息的编码规范;最后对GIS命令消息库进行了介绍。
In order to reduce the burden of network transmission,for the characteristics of massive geospatial data,through abstracting the collaborators’GIS operations and encapsulating them into GIS command message,a messagebased synchronous cooperative GIS is presented.Firstly,the system’s implementation mechanism is analyzed,and then the architecture of the system is brought forward.Considering GIS operations are complicated and multifarious,GIS operations’division size and the GIS command message’s encoding specification based on XML are discussed intensively.Finally,the storage of GIS command message is introduced.