Building a CHS bathymetric data warehouse

The CHS is designing and implementing a Source Database for bathymetric dat a. To store and manage terabytes of bathymetric information for producing C HS products and providing services to clients requires a fresh approach. Th e implementation of HHCode (Helical Hyperspatial Code) for storing, analyzi ng and accessing dense spatial data sets in an Oracle Relational Database M anagement System (RDBMS) is a key technology used to build the data warehou se. The paper addresses the concepts and applications necessary to manage t his data within the data repository. Specific areas addressed are aggregati on, attribution, and partitioning of the spatial data. The implementation o f an on-line, near-line and off-line model to minimize storage costs is des cribed. The approach used to perform horizontal and vertical datum transfor mations is discussed.