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wkt_format [2013/03/01 03:07] admin [Well-Known Text Format] |
wkt_format [2013/03/01 03:09] (current) |
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| ====== Well-Known Text Format ====== | ====== Well-Known Text Format ====== | ||
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| - | <note> | ||
| - | The original source of this description can be found [[http://docs.geotools.org/stable/javadocs/org/opengis/referencing/doc-files/WKT.html|here]]. | ||
| - | </note> | ||
| 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"]] | ||
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| + | <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> | ||