Hi,everyone,<br>&nbsp; I am wondering about ATM.yyyymmddhh.ctl file.There are three lines as the following:<br>pdef&nbsp;&nbsp; 92&nbsp;&nbsp; 54 lcc&nbsp;&nbsp; 33.00&nbsp;&nbsp; 89.00&nbsp;&nbsp; 46.00&nbsp;&nbsp; 27.00&nbsp;&nbsp; 30.00&nbsp;&nbsp; 60.00&nbsp;&nbsp; 89.00&nbsp; 45000.&nbsp; 45000.<br>xdef&nbsp; 263 linear&nbsp;&nbsp; 62.68&nbsp; 0.2027<br>ydef&nbsp; 125 linear&nbsp;&nbsp; 19.81&nbsp; 0.2027<br>Why the xdef and ydef is not in accord with the grid numbers I had defined which are 92 and 54 relativly?<br>Any reply is appreciated.<br><br> <br><!-- urlfiles --><br><br><!-- footer --><br>