2 GeoRaster Data Types and Related Structures

The object-relational implementation of GeoRaster consists of a set of object data types for storing data and system data.

Each image or gridded raster data is stored in a column of type SDO_GEORASTER, and the blocks in that raster data are stored in a raster data table of type SDO_RASTER, as explained and illustrated in GeoRaster Physical Storage. This chapter contains the following major sections.

• SDO_GEORASTER Object Type
  In the GeoRaster object-relational model, a raster image or grid object is stored in a single row, in a single column of object type SDO_GEORASTER in a user-defined table. Tables with at least one column of type SDO_GEORASTER are referred to as GeoRaster tables.
• SDO_RASTER Object Type and the Raster Data Table
  In the GeoRaster object-relational model, a raster data table (RDT) is used to store all cell data in a raster image.
• Other GeoRaster Types
  GeoRaster also porvides some other data types.
• GeoRaster System Data Views (xxx_SDO_GEOR_SYSDATA)
  GeoRaster uses a system data table (also called the sysdata table) to maintain the relationship between GeoRaster tables and their related raster data tables.
• GeoRaster XML Schema
  GeoRaster defines an XML schema to store and manage the GeoRaster metadata.