中文摘要：

提出了一种基于P2P的空间信息服务组合执行引擎设计.引擎使用空间信息服务团体模型和服务质量参数,在P2P网络中动态地选择最佳的执行引擎,通过P2P的消息和通信机制进行协作,完成复杂的空间信息服务组合执行任务.P2P的执行机制避免了集中式执行引擎带来的网络拥塞和单点失效问题,提高了空间信息服务组合的可靠性和可用性.

英文摘要：

A peer-to-peer based execution engine to improve the availability and reliability of geospatial information （GI） services composition is proposed. A service community concept and a QoS model of GI services are proposed to discover the best quality GI service engines in the peer-to-peer network. The engines coordinate other participants in charge of initiating, controlling, monitoring the associated GI services execution, and adopt an alternative approach for failure recovery. Compared with centralized ones, this model has several benefits, such as avoiding a single point of failure and improving the system performance.