Multilevel Updating Method of Three-dimensional Spatial Database

摘要

Spatial entities and the relationships between them in real world are changing over time, and the demands from continuous updating of all kinds of data are improving constantly. Therefore, how to maintain the current trend of spatial database becomes increasingly important. However, the spatial data, which exhibit the further feature of massive data, multilevel, concurrent operation of multi-users, make the data updating more difficult which is reflected on inefficiency, insecurity and inconsistency, etc. According to the features of spatial data and problems on updating of spatial database, the multilevel updating method of three-dimensional spatial database is presented based on the systematic analysis of theory and technology of Spatial Data Engine(SDE). In our system, the three-dimensional SDE introduce the SDO_GEOMETRY, which is an abstract data type provided by Oracle Spatial, to store spatial data types. The OCCI (Oracle C++Calling Interface) is also introduced instead of ODBC or JDBC to access and update the spatial data to improve the efficiency and connection stability of the database system. The multilevel structure of spatial data shows its feature of unstructuring, structuring and object-oriented during the storage of database. Finally, the multilevel spatial data updating method, which is realized in modules of Three-dimensional Spatial Data Management System to schedule and update the massive threedimensional spatial data, improves the efficiency, interaction and integrity of spatial database.