摘要
介绍了实际工作中经常遇到的地形图时空数据建库方法:保持现状式和数据追加式。分析对比了两种方法的优缺点:保持现状式实时维护了时空数据的现势性,方便现状数据的使用,但其数据库和表个数多,数据维护、历史数据恢复以及增量数据计算较复杂。数据追加式数据库个数少,数据维护、历史数据恢复以及增量数据计算较简单,但在使用现状数据时需做一定的数据查询、输出操作。作者建议使用后者,并将其中一个工作库固定为现状库,历史数据恢复时再建其他工作库以方便使用。
This paper introduces two methods to construct topographic map spatio-temporal database： current state keeping form and data appending form. Advantages and disadvantages of the two methods are discussed： current state keeping form can kee Pcurrent state of spatio-temporal data and be easy to use current data. However it has more databases and tables. It is complicated to maintain data, to recover historic data and to calculate increment data. Data appending form has fower databases. It is simple to maintain data, to recover historic data and to calculate increment data. However it needs to query data using current data. The author suggests that the later form should be used, to fix a working database as current state database, and to construct another working database to use conveniently recovering historic data.
出处
《测绘科学》
CSCD
北大核心
2008年第3期158-159,共2页
Science of Surveying and Mapping
关键词
地理信息系统-应用
时空数据库
保持现状式
数据追加式
geographic information system application
spatio-temporal database
current state keeping form
data appending form
