H2GIS

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ST_AsGeoJson

Signature

VARCHAR ST_AsGeoJson(GEOMETRY geom);

Description

Converts geom to its GeoJSON representation. Both 2D and 3D Geometries are supported.

Examples

SELECT ST_AsGeoJSON('POINT(1 2)');
-- Answer: {"type":"Point","coordinates":[1.0,2.0]}

SELECT ST_AsGeoJSON('POLYGON((101 345 1, 300 345 2, 300 100 2,
                              101 100 2, 101 345 1),
                             (130 300 2, 190 300 2, 190 220 2,
                              130 220 2, 130 300 2))');
-- Answer: {"type":"Polygon", "coordinates":[[[101.0, 345.0, 1.0],
--     [300.0, 345.0, 2.0], [300.0, 100.0, 2.0], [101.0, 100.0, 2.0],
--     [101.0, 345.0, 1.0]],
--    [[130.0, 300.0, 2.0], [190.0, 300.0, 2.0], [190.0, 220.0, 2.0],
--     [130.0, 220.0, 2.0], [130.0, 300.0, 2.0]]]}
See also