1
Download Oracle Spatial User's Guide and Reference
Transcript
Legacy Tables and Views
6.8.1.1 Well-Known Text (WKT)
The WKTEXT column of the MDSYS.CS_SRS table contains the well-known text
(WKT) description of the SRS, as defined by the Open Geospatial Consortium. The
following is the WKT EBNF syntax.
<coordinate system> ::=
<horz cs> | <local cs>
<horz cs> ::=
<geographic cs> | <projected cs>
<projected cs> ::=
PROJCS [ "<name>", <geographic cs>, <projection>,
{<parameter>,}* <linear unit> ]
<projection> ::=
PROJECTION [ "<name>" ]
<parameter> ::=
PARAMETER [ "<name>", <number> ]
<geographic cs> ::=
GEOGCS [ "<name>", <datum>, <prime meridian>, <angular unit> ]
<datum> ::=
DATUM [ "<name>", <spheroid>
{, <shift-x>, <shift-y>, <shift-z>
, <rot-x>, <rot-y>, <rot-z>, <scale_adjust>}
]
<spheroid> ::=
SPHEROID ["<name>", <semi major axis>, <inverse flattening> ]
<prime meridian> ::=
PRIMEM ["<name>", <longitude> ]
<longitude> ::=
<number>
<semi-major axis> ::=
<number>
<inverse flattening> ::=
<number>
<angular unit> ::= <unit>
<linear unit> ::= <unit>
<unit> ::=
UNIT [ "<name>", <conversion factor> ]
<local cs> ::=
LOCAL_CS [ "<name>", <local datum>, <linear unit>,
<axis> {, <axis>}* ]
<local datum> ::=
LOCAL_DATUM [ "<name>", <datum type>
{, <shift-x>, <shift-y>, <shift-z>
Beta Draft
Coordinate Systems (Spatial Reference Systems) 6-39
