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solids in relational database in a uniform format. Because the RO has a finite expression, we can solve the conflict
between the infinite precision real numbers of spatial object and the finite precision number systems of computers.
Once the realm concept has been extended to 3-dimension space, it allows the storage and management of all
spatial data (features, attributes, and even raster data) in a relational database. This architecture moves away from
the traditional concept of a GIS database in which spatial data is stored in a proprietary graphic format and tabular
attributes are stored in a separate database table. The general concept for spatial data in the relational database is
presented in Fig.2 by Entity-Relationship model.
Figure 2 describes the database schema. A feature table or view corresponds to a feature class. A feature is an
object with geometric attributes[14]. Each feature view contains a number of features represented as