谁能告诉我：2007年贷款卡年审时间（万分感谢）

2 RSDD-Based Spatial Data Type
Most spatial databases cannot manage vector data and raster data in a uniform way. Markus Schneider has
introduced realm concept in Ref.[11]. A realm is a set of points and non-intersecting line segments over a discrete
domain. Realm-based spatial data types are called POINTS, LINES, and REGIONS. Realm can successfully
manipulate 2-dimensional spatial data. It can enforce geometric consistency of related spatial objects, guarantee
nice closure properties for the computation with spatial data types, shield geometric computation in query
processing from numeric correctness and robustness problems, and be used as an index into the database[12]. But,
realm does not deal with 3-dimensional spatial data. In order to manage 3D data, we extend realm concept to
3-dimensional space, called RSDD(Regularly Spatial Discrete Domains). The topological relations and the
operations defined on 3D space are more complex, thus