Oracle Spatial User's Guide and Reference - InfoLab

Coordinate Systems Data Structures
1.000000000000]]'
The projected coordinate system contains a nested geographic coordinate system as
its basis, as well as parameters that control the projection.
Oracle Spatial supports all common geodetic datums and map projections.
An example of the WKT for a local coordinate system is:
LOCAL_CS [ "Non-Earth (Meter)", LOCAL_DATUM ["Local Datum", 0], UNIT ["Meter",
1.0], AXIS ["X", EAST], AXIS["Y", NORTH]]
For more information about local coordinate systems, see Section 6.3.
You can use the SDO_CS.VALIDATE_WKT function, described in Chapter 15, to
validate the WKT of any coordinate system defined in the MDSYS.CS_SRS table.
6.4.2 MDSYS.SDO_ANGLE_UNITS Table
The MDSYS.SDO_ANGLE_UNITS reference table contains one row for each valid
UNIT specification in the well-known text (WKT) description in the coordinate
system definition. The WKT is described in Section 6.4.1.1.
The MDSYS.SDO_ANGLE_UNITS table contains the columns shown in Table 6–2.
Table 6–2 MDSYS.SDO_ANGLE_UNITS Table
Column Name Data Type Description
SDO_UNIT VARCHAR2(32) (Reserved for future use by Oracle Spatial.)
UNIT_NAME VARCHAR2(100) Name of the angle unit. Specify a value from this
column in the UNIT specification of the WKT for
any user-defined coordinate system. Examples:
Decimal Degree, Radian, Decimal Second, Decimal
Minute, Gon, Grad.
CONVERSION_
FACTOR
6.4.3 MDSYS.SDO_DATUMS Table
The MDSYS.SDO_DATUMS reference table contains one row for each valid
DATUM specification in the well-known text (WKT) description in the coordinate
system definition. The WKT is described in Section 6.4.1.1.
The MDSYS.SDO_DATUMS table contains the columns shown in Table 6–3.
6-12 Oracle Spatial User’s Guide and Reference
NUMBER The ratio of the specified unit to one Radian. For
example, the ratio of Decimal Degree to Radian is
0.017453293.