PostGIS
Name
ST_AsText — Return the Well-Known Text (WKT) representation of the geometry/geography without SRID metadata.
Synopsis
text +`*`+ST_AsText*(`geometry `g1`)`;
text +`*`+ST_AsText*(`geometry `g1, integer
maxdecimaldigits = 15`)`;
text +`*`+ST_AsText*(`geography `g1`)`;
text +`*`+ST_AsText*(`geography `g1, integer
maxdecimaldigits = 15`)`;
Description
Returns the OGC Well-Known Text (WKT) representation of the geometry/geography. The optional `maxdecimaldigits` argument may be used to limit the number of digits after the decimal point in output ordinates (defaults to 15).
To perform the inverse conversion of WKT representation to PostGIS geometry use ST_GeomFromText.
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Availability: 1.5 - support for geography was introduced.
Enhanced: 2.5 - optional parameter precision introduced.
[.inlinemediaobject]
This method implements the
OGC Simple Features
Implementation Specification for SQL 1.1.
s2.1.1.1
This
method implements the SQL/MM specification.
SQL-MM 3: 5.1.25
This
method supports Circular Strings and Curves.
Examples
SELECT ST_AsText('01030000000100000005000000000000000000
000000000000000000000000000000000000000000000000
F03F000000000000F03F000000000000F03F000000000000F03
F000000000000000000000000000000000000000000000000');
st_astext
--------------------------------
POLYGON((0 0,0 1,1 1,1 0,0 0))Full precision output is the default.
SELECT ST_AsText('POINT(111.1111111 1.1111111)'));
st_astext
------------------------------
POINT(111.1111111 1.1111111)The `maxdecimaldigits` argument can be used to limit output precision.
SELECT ST_AsText('POINT(111.1111111 1.1111111)'), 2);
st_astext
--------------------
POINT(111.11 1.11)