PostGIS_GDAL_Version — Reports the version of the GDAL library in use by PostGIS.
text PostGIS_GDAL_Version();
Reports the version of the GDAL library in use by PostGIS. Will also check and report if GDAL can find its data files.
SELECT PostGIS_GDAL_Version();
postgis_gdal_version
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GDAL 1.11dev, released 2013/04/13