ST_AsSVG-PolarDB(PolarDB)-阿里云帮助中心

Returns the Scalable Vector Graphics (SVG) path data for a geometry or geography object.

Syntax

text ST_AsSVG(geometry geom, integer rel, integer maxdecimaldigits);
text ST_AsSVG(geography geog, integer rel, integer maxdecimaldigits);

ST_AsSVG converts a geometry or geography object into SVG path data as a text string.

By default, coordinates use absolute moves (rel=0). Set rel=1 to switch to relative moves.

Parameter	Description
`geom`	The geometry object to convert.
`geog`	The geography object to convert.
`rel`	Path coordinate mode. `0` (default) uses absolute moves. `1` uses relative moves.
`maxdecimaldigits`	Maximum number of decimal places in the output. Default: `15`.

Point (absolute mode)

SELECT ST_AsSVG(ST_GeomFromText('POINT(116 40)',4326));

Output:

 cx="116" cy="-40"
(1 row)

The y-coordinate is negated because SVG uses a top-down coordinate system, while geographic coordinates increase upward.