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：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：Databases (DBs) are designed from scratch due to application specifications of organizations. Sometimes the same real world object occurs in different semantics in different DBs. DBs may be autonomous on different computers and computers may have different operating systems, DBs may be designed for different purposes and applications and DBs may use different data formats. In order to use legacy data instead of re-collecting the same content, data in a wide variety databases are needed to be integrated. Data integration is done either gathering data without any integration or by integrating several source data partly or as a whole into a single DB. The method, integrating several DBs into one single DB, is implemented while developing Populated Places DB of Turkey (PPDB_T). To implement the integrated DB, information about populated places except population was collected from a plain table, population information are extracted from State Statistics Institute (SSI) DB and administrative boundaries are taken from Digital Chart of Turkey (DCT) at scale 1:1000000. Ladder technique is applied for schema and data integration. Although the data is stored in and managed by a non-spatial DB system, in order to improve geometric accuracy of location information, a subset of PPDB_T is transformed into a spatial DB and location information are corrected with the help of standard topographic map index and administrative boundaries of provinces and districts. This need forces mapping a subset of the non-spatial DB containing location information into spatial world and integrate it with DCT to do corrections and transfer the corrected location and information back to PPDB_T
