一般空间对象的空间数据类型

空间数据类型的定义一直是空间数据库和GIS等领域的研究热点.针对一般空间对象的空间数据类型定义问题,依据点集和拓扑理论,采用函数方法,研究了一般空间对象的特点,并给出了一组有效时间内的一般空间对象的带时间维的空间数据类型定义,包括一般点,一般线,一般区域.一般空间对象的空间数据类型定义将一般点定义为多个单点的并集;一般线定义为多个连续函数的并集;一般区域定义为多个面的并集.在一般空间对象的空间数据类型基础上,可建立一般空间对象的数据模型,一般空间对象的空间关系,从而在空间查询中,能处理针对一般空间对象的空间查询.

Space Data Type for General Space Object

The design of space data type is a focus in space database and GIS.To solve the problem of space data type for general space object,on the basis of point sets and topology,This paper uses the method of function,studies the features of the general space object and gives a group of space data types with time dimension aiming at the general space object in available time,including general point,general line and general region.In space data type for general space object,general point is regarded as a union set of many isolate points,general line is regarded as a union set of many continuous functions,and general region is regarded as a union set of many faces.On the base of those space data types for general space object,the space models,space relationships aiming at the general space objects can be formulated.Then the space query aiming at the general space object can be accomplished.