This topic describes the ST_GeogFromText function. This function constructs a geography object by using a standard Well-Known Text (WKT) string or an Extended Well-Known Text (EWKT) string.
Syntax
geography ST_GeogFromText(text eWKT);
Parameters
Parameter | Description |
---|---|
eWKT | The standard WKT string or EWKT string that you want to specify. |
Description
- If you do not specify a spatial reference identifier (SRID), the default SRID 4326 is used.
- This function is equivalent to the ST_GeographyFromText function.
- The coordinates of a point follow the order in which the longitude precedes the latitude.
Examples
- Construct a geography object by using the default SRID 4326.
SELECT ST_SRID(ST_GeogFromText('POINT(116 40)')); st_srid --------- 4326 (1 row)
- Construct a geography object by using a specified SRID.
SELECT ST_SRID(ST_GeogFromText('SRID=4256;POINT(116 40)')); st_srid --------- 4256 (1 row)