postgis-workshop

postgis-functions

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	Appendix A: PostGIS Functions
	Constructors
	:command:`ST_MakePoint(Longitude, Latitude)`
	Returns a new point. Note the order of the coordinates (longitude then latitude).
	:command:`ST_GeomFromText(WellKnownText, srid)`
	Returns a new geometry from a standard WKT string and srid.
	:command:`ST_SetSRID(geometry, srid)`
	Updates the srid on a geometry. Returns the same geometry. This does not alter the coordinates of the geometry, it just updates the srid. This function is useful for conditioning geometries created without an srid.
	:command:`ST_Expand(geometry, Radius)`
	Returns a new geometry that is an expanded bounding box of the input geometry. This function is useful for creating envelopes for use in indexed searches.
	Outputs
	:command:`ST_AsText(geometry)`
	Returns a geometry in a human-readable text format.
	:command:`ST_AsGML(geometry)`
	Returns a geometry in standard OGC :term:`GML` format.
	:command:`ST_AsGeoJSON(geometry)`
	Returns a geometry to a standard `GeoJSON <http://geojson.org>`_ format.
	Measurements

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postgis-intro/sources/locale/pot/postgis-functions.pot, string 3