Since i haven´t found this on the web:
When you try to create a table with MDSYS.SGO_GEORASTER and you´re receiving an ORA-00902: invalid datapye try the following:
SQL> @create_tab.sql "GEORASTER" "MDSYS"."SDO_GEORASTER" , * ERROR at line 12: ORA-00902: invalid datatype
Try to grant EXECUTE permissions on the data type to the user creating the table.