期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B6b
页码：217-224
出版社：Copernicus Publications
摘要：We have constructed multi-scales foundational geographical database in china, and have released diverse spatial data and derived products. But how to keep the currency and continual updating of spatial data becomes the key problem. Now we almost update geographic information in batch volume mode. Data vender provides updated data to client users and the users update their own database according to the updated data. But this approach shields the concrete contents of geographic feature changes, as well as the difference of semantics, structures of geographic information between the vendors and clients. So batch updates method is time- consuming and troublesome with low efficiency. Incremental updates based on change-only information provide a novel approach for geographic data updating. Incremental updates only record the change-only information and characteristics in master database between different version datasets, and deliver the delta information to client users and integrate them into client database. The paper develops the technique workflow of extraction and distribution of change-only information based on different version databases. We take road features as an example to analyze the change types of realistic entities and discuss the object match method in the process of extraction of change-only information. Also we give the definition of change-only information and the idea about distribution and issue of change-only information to update user's database
