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SQL> select st_transform(shape,51)
2 from parks_st
3 where objectid = 1;
ERROR at line 1:
ORA-20603: Spatial References are not compatible.
ORA-06512: at "SDE.ST_GEOMETRY_SHAPELIB_PKG", line 752
ORA-06512: at "SDE.ST_GEOMETRY_OPERATORS", line 1882
If the datums of the source and destination spatial references are different, then ST_Transform fails with the error referenced above.
This is true of the implementations of ST_Transform on Oracle, IBM DB2, and IBM Informix.
Only use ST_Transform with source and destination spatial references that have the same datum.