convert Postgres geometry format to WKT

Question

I have a Postgres table which stores polygon geometry in its specific format in one of the column, something like this-

0103000020E61000000100000004000000B86         


        

Answer 1

Have you tried this?

SELECT ST_AsText(your_geom_column) FROM your_table

Example:

CREATE TEMPORARY TABLE tmp (geom GEOMETRY);
INSERT INTO tmp VALUES (ST_GeomFromText('POINT (1 2)')),
                       (ST_GeomFromText('POINT (2 4)'));

Geometries as EWKT:

db=# SELECT geom FROM tmp;
                    geom                    
--------------------------------------------
 0101000000000000000000F03F0000000000000040
 010100000000000000000000400000000000001040

Geometries as WKT:

db=# SELECT ST_AsText(geom) FROM tmp;
 st_astext  
------------
 POINT(1 2)
 POINT(2 4)

In case you fancy GeoJSON ..

db=# SELECT ST_AsGeoJSON(geom) FROM tmp;    
             st_asgeojson             
--------------------------------------
 {"type":"Point","coordinates":[1,2]}
 {"type":"Point","coordinates":[2,4]}

.. or even GML

db=# SELECT ST_AsGML(geom) FROM tmp;    
                           st_asgml                            
---------------------------------------------------------------
 <gml:Point><gml:coordinates>1,2</gml:coordinates></gml:Point>
 <gml:Point><gml:coordinates>2,4</gml:coordinates></gml:Point>