空间信息网格中异步Web计算服务设计与实现

目前空间信息网格平台上的计算处理功能通常是以Web服务形式对外发布的，而较长时间的处理任务通常会导致Web服务超时，同时现有的处理服务大都基于各自制定的私有协议，相互之间难以实现互操作。本文针对上述问题，在充分分析OGC的Web处理服务基础上，给出了一种基于OGC标准的异步Web处理服务框架。基于该框架实现的处理算法，可以避免因为计算时间过长而失去响应的问题，同时该框架也具有很好的扩展性，算法提供者可以很容易的将自己的算法集成到已有的服务中。同时该服务框架遵循WPS标准，可以与其他遵循WPS标准的处理服务实现互操作与资源共享。

Design and Implementation of Asynchronous Web Processing Service in SIG

Currently,the image processing functions built on Spatial Information Grid(SIG)are published as web services.The main problem with such a method is the time-out of connection when some long-term processing tasks are executed.Besides,the existing processing services are almost based on the private protocols made by different providers and so that it is hardly to interoperate among them.Against the above problems,based on fully analysis of Web Processing Service,this paper proposed an asynchronous web processing service framework based on Open Geospatial Consortium(OGC)standards.The process services which conform to this framework can avoid the timeout caused by long-term computation.Also this framework has excellent extensibility so that the algorithm providers can integrate their algorithm into current services easily.As the results based on WPS standard,it also has the interoperative capability and shares resource with other standard process services.