Oracle Spatial User's Guide and Reference - InfoLab

Creating a User-Defined Coordinate System
Some of these parameters are appropriate for several projections. They are not all
appropriate for every projection.
Example 6–2 creates a user-defined projected coordinate system. The first four
columns are not the WKT information, but specify other fields in the MSDYD.CS_
SRS table. The WKT information starts with PROJCS. This example is similar to an
existing coordinate system, but has a different name, SRID, and central meridian.
Example 6–2 Creating a User-Defined Projected Coordinate System
INSERT INTO mdsys.cs_srs VALUES ('UTM Zone 44.5, Northern Hemisphere (WGS 84)',
1082378, 1082378, 'Oracle',
'PROJCS["UTM Zone 44.5, Northern Hemisphere (WGS 84)",
GEOGCS [ "WGS 84",
DATUM ["WGS 84 ",
SPHEROID ["WGS 84", 6378137.000000, 298.257224]],
PRIMEM [ "Greenwich", 0.000000 ],
UNIT ["Decimal Degree", 0.01745329251994330]],
PROJECTION ["Transverse Mercator"],
PARAMETER ["Scale_Factor", 0.999600],
PARAMETER ["Central_Meridian", 84.000000],
PARAMETER ["False_Easting", 500000.000000],
UNIT ["Meter", 1.000000000000]]',NULL);
Example 6–3 creates a user-defined geodetic coordinate system. The first four
columns are not the WKT information, but specify other fields in the MSDYD.CS_
SRS table. The WKT information starts with GEOGCS. This example includes an
ellipsoid (SPHEROID) definition in which the semi-major axis and inverse
flattening parameters are slightly changed from the WGS 84 coordinate system, as
well as a different datum definition. Because the shift_x and shift_y parameter
values are specified, all the shift, rotation, and scaling values must be specified.
There is no projection information included for a geodetic coordinate system.
Example 6–3 Creating a User-Defined Geodetic Coordinate System
INSERT INTO mdsys.cs_srs VALUES
( 'Longitude / Latitude (WGS 90)', 1008307, 1008307, 'Oracle',
'GEOGCS [ "Longitude / Latitude (WGS 90)",
DATUM ["WGS 90",
SPHEROID ["WGS 90", 6378137.032499, 298.257236], 100, 100, 0, 0, 0, 0, 0],
PRIMEM [ "Greenwich", 0.000000 ],
UNIT ["Decimal Degree", 0.01745329251994330]]',NULL);
Coordinate Systems (Spatial Reference Systems) 6-19