Export georaster into file (tfw problem)

Question

Hi,
I want to export some georaster into the file system with different resolution of the image. after storage the data in sdo_georaster i built pyramids. now i want to export the data in different pyramid-level with:
CREATE OR REPLACE PROCEDURE A
IS
GR SDO_GEORASTER;
BEGIN
SELECT GEORASTER INTO GR FROM T99_GEORASTER WHERE ID = 1;
SDO_GEOR.EXPORTTO(GR, 'PLEVEL=4', 'TIFF', 'FILE', 'e:\bla\aaa', 'WORLDFILE', 'FILE', 'e:\bla\aaa');
END;
after i export my files aaa.tif and aaa.tfw i have the right image but a wrong tfw-information. the pixel-width und pixel-height in the tfw are wrong. if i change the plevel=2 (available 1..6) to 2 the get the result as the same tfw-data as in the plevel=4-export. so the only level, the georeferencing data are correct is with pyramidlevel=0?
anybody know my error or can help me?
thanks,
michael

Answer 1

If I understand you right, you want to replace any occurance of 'SEQ' in the variable mmy_col_string with another value (new column name)?
This would work like so:
declare
   mmy_col_string   varchar2(100) := 'SELECT ID, SEQ, NAME FROM TABLE;';
   col_name_replace varchar2(30)  := 'SEQ';
   new_col_name     varchar2(30)  := 'NEW_COLUMN_NAME';       
   pos              number        := 0;
begin
   pos := instr(mmy_col_string, col_name_replace);
   while pos > 0 loop
      mmy_col_string := substr(mmy_col_string, 1, (pos-1)) || new_col_name || substr(mmy_col_string, (pos + length(col_name_replace)));
      pos := instr(mmy_col_string, col_name_replace);
   end loop;
end;
/Regards,
Gerd