sdjiangwei wrote: > gis=# select transform('SRID=2001;POINT(100 100)'::geometry,2200); > WARNING: Error occurred while executing PL/pgSQL function transform > WARNING: line 2 at return > ERROR: tranform: couldnt parse proj4 output string You didnt setup your spatial_ref_sys table properly - see the documentation (postgis.refractions.net). dave