OWS性能监测评价方法研究及其原型系统实现——以OGC WMS为例

摘要

针对互联网上所共享发布的开放地理空间联盟网络服务(OWs)经常会出现不能访问或运行速度缓慢而导致难以利用的问题,为测试和评价这些地理信息服务的可用性和性能,通过研究OWS服务的固有特点,提出了实时监测OWS状态的动态规划模型和基于评价因子、评价权重等参数的评价模型,用以实现对OWS的监测与评价；基于上述模型与因子,设计开发了面向OWS的实时监测和性能评价原型系统,并以OGC网络地图服务(WMS)为例对模型与原型系统进行了实验验证.结果表明:该系统能够对相应的OWS进行实时监测与评价,所提的监测与评价方法与模型可为用户在众多的服务资源中获取其所感兴趣的数据提供参考信息,为地理信息服务使用者查找更优的服务资源提供帮助.%Open geospatial consortium Web Services (OWS) are essential parts for the national and global geospatial data infrastructure construction and have been increasingly adopted to publish the geographic data through the Internet for sharing and interoperation. However, these services are widely dispersed and hard to be recovered once they are inaccessible or need long response time. Focusing on the availability and performance of the OWS, a dynamic task-planning model was generated for monitoring OWS. And, a model-based monitoring workflow and an evaluation model were proposed including evaluation factors and weights. Based on the above models, a special prototype was developed to monitor the services statuses dynamically and evaluate performance considering the history accessibility records. An experiment of Web Map Service (WMS) was done to demonstrate the abilities of the developed prototype system.