摘要
随着海洋观测技术的不断发展,人类获取的海洋数据也快速增长,由于海洋流场是整个海洋系统物质流和能量流输送的主要渠道,基于这些观测数据进行海洋流场迁移变化规律分析及可视化表达研究,对所有涉海领域均具有非常重要的意义。然而,由于海洋时空大数据集合的多源性和异构性等原因,至今尚未有令人满意的海洋流场数据集成共享和动态可视化分析工具,从而导致这些异源异构数据难以实现统一标准下的集成组织与语义共享。为了实现海洋流场语义层次上的统一描述,本文在分析了海洋流场多维特征、拓扑特征、模糊特征等基础上,基于本体论的语义构建思想,提出并构建了基于四元组O=(C,P,R,I)的本体组织基础结构,其中C表示概念集合、P表示属性集合、R表示概念间的关系集合、I表示实例集合,通过对概念、属性、关系结构的进一步定义,共同组合构成了海洋流场整体本体结构。为了给出清晰的本体语义建模过程,以海流现象局部本体构建为例,在对成因性、空间性、时间性、运动性等本体属性分析的基础上,进行了海流概念、本体属性、语义关系的描述和定义,从而为海洋流场组织提供一个规范性框架。进而借助OWL语言本体建模的优势,以地转流为例进行了其形式化表达和本体类构建。研究结果表明,基于本体的海洋流场语义分析方法能有效地解决传统海洋现象描述中的异构问题,可为海洋信息共享与集成研究提供参考。
With the development of ocean monitoring technologies, the people are getting more and more ocean data. Because the ocean flow is the main channel for material and energy transportation in the whole ocean system, it is of great significance for all sea related fields to analyze the migration law and visualize the change of the ocean flow field based on these ocean data. However, due to the characteristics of multi-sources and heterogeneity of these ocean space-time large datasets, there are still no satisfactory models and tools for spatiotemporal data analysis and dynamic visualization of ocean flow field. It is also very hard to organize and share these heterogeneous data at an unified standard. For this reason, in order to realize the unified description of ocean flow field at semantic levels, based on the analysis of multi-dimensional, topological and indefinite characteristics of the ocean flow, and based on the idea of ontological semantic analysis, this paper proposed and constructed an ontology organization infrastructure which was composed of four tuples, O=(C,P,R,I), in which C is the collection of concepts, P is the collection of attributes, R is the collection of relationships between concepts, and I is the collection of instances. By combining the definitions of concepts, attributes, and relational structures, the paper constructed the whole ontology structure of ocean flow field. In order to give a clear ontology semantic modeling procedure, the paper took the local ontology construction of ocean current phenomena as an example, gave the definition of concepts, ontology attributes and semantic relationships of ocean flow filed based on the analysis of ontological attributes such as causes, spatiality, temporality, and mobility, providing a specification framework for the organization of ocean flow data. Taking the geostrophic current as the example, with the advantage of Web Ontology Language(OWL) on modeling and constructing ontology, the paper gave the formal expression and constructed the related ontology classes of the geostrophic current. The research showed that the ontology based ocean flow field semantic analysis method could effectively solve the heterogeneous issues in the traditional marine phenomenon description, and could provide certain references for the study of marine information sharing and integration.
引文
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