Abstract: Based on the field model, a uniform dynamic field model is proposed to support representing the characteristics of distribution continuity and time development of spatial phenomena. Through analytical expressions and arrays data structures, data types and operating functions of the new model are extended in an object-relational database to support uniform representation, management, access and spatio-temporal querying for continuous and discrete dynamic fields. Several examples are demonstrated to discuss the representing and querying ability of the new model and its database extension.

Key words: field-based model, continuous field, discrete field, dynamic field, spatio-tem

摘要： 为支持对空间现象的分布连续性和时间动态性的表达，实现在数据库中对场数据进行统一存储和时空查询分析，提出解析式结构表达连续场和矩阵结构表达离散场的统一动态场模型，并在空间数据库中实现其类型和操作扩展，支持连续和离散动态场的统一表达、管理、访问及时空查询分析，支持二者的相互转换，实现场模型数据和对象模型数据的一体化处理。实例研究表明该模型及其数据库扩展很好表达时空现象并支持场数据的空间数据库管理和时空查询。

关键词: 场模型, 连续场, 离散场, 动态场, 时空查询, GIS