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wkt_format [2013/03/01 03:03] admin [Well-Known Text format] |
wkt_format [2013/03/01 03:09] admin |
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- | ====== Well-Known Text format ====== | + | ====== Well-Known Text Format ====== |
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- | **This description is a verbatim copy from http://docs.geotools.org/stable/javadocs/org/opengis/referencing/doc-files/WKT.html** | + | |
Many entities in this specification can be printed in a well-known text format. This allows objects to be stored in databases (persistence), and transmitted between interoperating computer programs. Each entity has a keyword in upper case (for example, DATUM or UNIT) followed by the defining, comma-delimited, parameters of the object in brackets. Some objects are composed of objects so the result is a nested structure. Implementations are free to substitute standard brackets ( ) for square brackets [ ] and should be prepared to read both forms of brackets. The definition for WKT is shown below using Extended Backus Naur Form (EBNF). The WKT for a math transform can be used inside a engineering coordinate reference system, so it is shown first. | Many entities in this specification can be printed in a well-known text format. This allows objects to be stored in databases (persistence), and transmitted between interoperating computer programs. Each entity has a keyword in upper case (for example, DATUM or UNIT) followed by the defining, comma-delimited, parameters of the object in brackets. Some objects are composed of objects so the result is a nested structure. Implementations are free to substitute standard brackets ( ) for square brackets [ ] and should be prepared to read both forms of brackets. The definition for WKT is shown below using Extended Backus Naur Form (EBNF). The WKT for a math transform can be used inside a engineering coordinate reference system, so it is shown first. | ||
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AUTHORITY["EPSG","5701"]], | AUTHORITY["EPSG","5701"]], | ||
AUTHORITY["EPSG","7405"]] | AUTHORITY["EPSG","7405"]] | ||
+ | |||
+ | <note> | ||
+ | The original source of the WKT format description used here can be found at\\ | ||
+ | http://docs.geotools.org/stable/javadocs/org/opengis/referencing/doc-files/WKT.html | ||
+ | </note> | ||