(mysql.info.gz) GIS WKT format
Info Catalog
(mysql.info.gz) Supported spatial data formats
(mysql.info.gz) Supported spatial data formats
(mysql.info.gz) GIS WKB format
18.3.1 Well-Known Text (WKT) Format
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The Well-Known Text (WKT) representation of Geometry is designed to
exchange geometry data in ASCII form.
Examples of WKT representations of geometry objects are:
* A `Point':
POINT(15 20)
Note that point coordinates are specified with no separating comma.
* A `LineString' with four points:
LINESTRING(0 0, 10 10, 20 25, 50 60)
Note that point coordinate pairs are separated by commas.
* A `Polygon' with one exterior ring and one interior ring:
POLYGON((0 0,10 0,10 10,0 10,0 0),(5 5,7 5,7 7,5 7, 5 5))
* A `MultiPoint' with three `Point' values:
MULTIPOINT(0 0, 20 20, 60 60)
* A `MultiLineString' with two `LineString' values:
MULTILINESTRING((10 10, 20 20), (15 15, 30 15))
* A `MultiPolygon' with two `Polygon' values:
MULTIPOLYGON(((0 0,10 0,10 10,0 10,0 0)),((5 5,7 5,7 7,5 7, 5 5)))
* A `GeometryCollection' consisting of two `Point' values and one
`LineString':
GEOMETRYCOLLECTION(POINT(10 10), POINT(30 30), LINESTRING(15 15, 20 20))
A Backus-Naur grammar that specifies the formal production rules for
writing WKT values can be found in the OGC specification document
referenced near the beginning of this chapter.
Info Catalog
(mysql.info.gz) Supported spatial data formats
(mysql.info.gz) Supported spatial data formats
(mysql.info.gz) GIS WKB format
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