postgis.gdal_datapath — A configuration option to assign the value of GDAL's GDAL_DATA option. If not set, the environmentally set GDAL_DATA variable is used.
                    A PostgreSQL GUC variable for setting the value of GDAL's GDAL_DATA option. The postgis.gdal_datapath value should be the complete physical path to GDAL's data files.
                
This configuration option is of most use for Windows platforms where GDAL's data files path is not hard-coded. This option should also be set when GDAL's data files are not located in GDAL's expected path.
                 
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                 This option can be set in PostgreSQL's configuration file postgresql.conf. It can also be set by connection or transaction.  | 
            
Availability: 2.2.0
                 
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                 Additional information about GDAL_DATA is available at GDAL's Configuration Options.  | 
            
Set and reset postgis.gdal_datapath
SET postgis.gdal_datapath TO '/usr/local/share/gdal.hidden';
SET postgis.gdal_datapath TO default;
                
        Setting on windows for a particular database
ALTER DATABASE gisdb SET postgis.gdal_datapath = 'C:/Program Files/PostgreSQL/9.3/gdal-data';