关键词: 时间地理信息系统, 地籍信息系统, 时空数据结构

Abstract: This paper explores the issues in the application of temporal GIS in the development of Cadastral Information Systems.Temporal GIS is now one of the most important areas in the development of Geographical Information Systems.Its application can not only facilitate the storage of historical data, but also make the time based analysis of spatial phenomena possible. And it can improve the abilities of dynamic management.analysis and decision-making on geographical information.Cadastral information management, whose data has an archive type structure and changes frequently,is a promising area for the application of Temporal GIS.Some specific issues should be studied before applying Temporal GIS in the development of Cadastral information systems.Boundary point, parcel, point feature and line feature,each with its attribute,are four elementary features in cadastral information management.Date Stamping method is used to build spatiotemporal data structures for each of the elementary features and its attribute.In addition, problems of subdivision and consolidation of parcels are taken into consideration in the building of the data structure.In this paper’s data structure, apart from the identifier, the creating date and the ceasing date,the record of each boundary point records its accurate coordinates and all the parcels whose boundary cross it; the record of each parcel records its composition of boundary points,its ancillary features, its origins and its changing state;the record of each point feature records its coordinates;the record of each line feature records a series of coordinate of points.Through this kind of data structure,all boundary points,no matter when they occur,are stored in one database;all parcels are stored in another database;all point features and all line features are stored in their own databases respectively.Date stamping method is also used to build data structures for attribute databases,so that all attributes of all boundary points,all attributes of all parcels, all attributes of all point features and all attributes of all line features are stored in their attribute databases respectively.Updating and querying procedures are taken as examples to study the accessing and applications of the data types in this paper.When a feature ceases to exist,the database can be updated by simply adding the ceasing date to the related records.If a feature has changed into some other features,apart from adding ceasing time to the old record,several new records should be inserted to record the new features.Based on this kind of data structure,querying can bedone in the time dimension as well as in the space dimension and the attribute dimension.The results of this paper have been found successful in the development of the Cadastral Information System for Langfang in Hebei Province.

Key words: temporal GIS, Cadastral Information Systems, spatiotemporal data