I think you must convert the station data into gridded data by the command 'oacres' which interpolates the station data points to regular grid. May be useful.<br><br clear="all"><div><br></div>-- <br>Sincerely<br>***********************************************<br>
Jayakrishnan.P.R<br>CSIR-Senior Research Fellow<br>Department of Atmospheric Sciences<br>Cochin University of Science and Technology (CUSAT), Cochin-682 016<br>Kerala, India.<br>Mob: 09895417565<br><br>***********************************************<br>