[gradsusr] error in gr2stn script

[Geeta Geeta]

Dear All, 
I am trying to use the "gr2stn " function of grads but failed. I am posting the following message from grads. My gridded data file is the gfs grib files. 

 ga-> reinit
No hardcopy metafile open
All files closed; all defined objects released
All GrADS attributes have been reinitialized
ga-> open 12mar2008
Scanning description file:  12mar2008
Data file gdas2008031200f00 is open as file 1
LON set to 0 360 
LAT set to -90 90 
LEV set to 1000 1000 
Time values set: 2008:3:12:0 2008:3:12:0 
ga-> set t 1
Time values set: 2008:3:12:0 2008:3:12:0 
ga-> set lev 1000
LEV set to 1000 1000 
ga-> d gr2stn(TMP2M,77.5,12.5)
Error from GR2STN: 2nd argument must be stns
Operation Error:  Error from gr2stn function
  Error ocurred at column 1
DISPLAY error:  Invalid expression 
  Expression = gr2stn(tmp2m,77.5,12.5)



If I use this function with the WRF output, I get the following message. 
ga-> reinit
No hardcopy metafile open
All files closed; all defined objects released
All GrADS attributes have been reinitialized
ga-> open test
Scanning description file:  test
Data file test.dat is open as file 1
LON set to 60.2713 89.7287 
LAT set to 0.57003 23.9053 
LEV set to 1000 1000 
Time values set: 2010:4:24:0 2010:4:24:0 
ga-> set t 1
Time values set: 2010:4:24:0 2010:4:24:0 
ga-> set lev 1000
LEV set to 1000 1000 
ga-> d gr2stn(T2, 77.5, 12.5)
Error from GR2STN: Grid must have linear scaling
Operation Error:  Error from gr2stn function
  Error ocurred at column 1
DISPLAY error:  Invalid expression 
  Expression = gr2stn(t2,77.5,12.5)
ga-> 

I Think that since WRF output does not have fixed dx and dy so the error. 

Kindly suggest. 
Geeta

 		 	   		  
_________________________________________________________________
Catch the latest in the world of fashion
http://lifestyle.in.msn.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20100426/690c0685/attachment-0003.html