对地观测传感网结点环境下地学工作流的构建方法研究

In a sensor web system, a sensor web node is a collection of a series sensor web service resources that have common functionalities. And the whole earth observation sensor web system can be seen as the collection of a series heterogeneous, loose coupled, and distributed sensor web nodes. Under the sensor web node environment, a complex earth observation mission requires the online resource matching, combination, and coordinating of different sensor observation resources, data processing resources, and application web service resources from multi, distributed sensor web nodes. In this project, we focus our research on how to coordinate distributed Web Service resources in Sensor Web nodes and task complex earth observation missions, and help the sensor web performed as a unit with full function. In order to coordinate the distributed Web Service in Sensor Web nodes and implement the earth observation missions, this project proposed a Geospatial workflow construction method under the Sensor Web nodes environment. The research is consisting of three parts: construction the Sensor Web node metadata model, web service resource matching between different Sensor Web nodes, and the workflow coordination method based on workflow pattern. This research will bridge the interoperation gap between different Sensor Web nodes. This expected research result of this project will provide significant methodology basis for interrelated and dynamic coupling of Sensor Web node resources, and also can be applied in the earth observation scenarios, such as flood detection.

在传感网系统中，一个传感网节点是一系列具有相同特定功能的传感网服务资源的集合。整个对地观测传感网系统可以看作是一系列异构、异质、分布式的传感网节点的集合。在传感网节点环境下，一个复杂对地观测任务的构建需要多个传感网节点间的不同的传感器观测资源，数据处理资源和应用服务资源的在线匹配、组合、协同完成。如何实现协同分布的传感网节点服务资源执行对地观测任务，使传感网表现为一个具备完整功能的整体，是本课题的主要研究内容。本课题提出传感网节点环境下的地学工作流构建方法，围绕传感网节点元模型的构建、节点服务资源的精确匹配、动态地学工作流的构建展开研究，弥合各个传感网节点之间的互操作鸿沟。研究成果对于传感网节点资源的相互关联和动态耦合研究有着重要的学术价值，也可应用于如洪水监测等复杂应用对地观测场景，具有重要的应用价值。

本课题围绕目标科学问题和难点，研究传感网节点环境下工作流服务方法，包括：传感网节点分类方法和元数据模型构建方法，在传感网节点层面描述目前各自独立运行的各种监测资源、数据资源和应用服务资源，弥合各个传感网节点之间的协同鸿沟；传感网节点服务资源的匹配方法，用于实现匹配对地观测任务所需的服务资源内容；动态的地学工作流服务方法，用于实现各传感网节点内服务资源的协同工作，构建一个由多传感网节点组成的综合、持续、协同的对地观测服务方法。本课题提出的理论和方法可以将对地观测传感网节点可广泛应用于对地观测任务，并为全球性、国家性、地区性、部门性环境、健康、灾害等社会公益事业的政策制定、决策与服务提供更快、更多、更好的信息服务基础。研究成果可应用在环境监测、智慧城市中观测整合等复杂对地观测任务场景，有着非常重要的学术和应用价值。