[gradsusr] GTOPO30

[Dibas Shrestha]

Hi all 

I have downloaded e060n40 elevation data and converted to E060N40.DEM. 
Then tried to use grads with following control file,
DSET ^E060N40.DEM 
TITLE topography data
UNDEF -9999
OPTIONS little_endian
XDEF
 4800  LINEAR   60     0.00833333333333
YDEF 6000  LINEAR   -10    0.00833333333333
ZDEF 1    LEVELS 0 
TDEF  48    Linear
 26jun2001 06hr
VARS    1
topo    0       1       height [meter]
ENDVARS

But the following error is occured,

ga-> d topo
Low Level I/O Error:  Read error on data file 
  Data file name = E060N40.DEM 
  Error reading 4800 bytes at location 14400000 
Data Request Error:  Error for variable 'topo'
  Error ocurred at column 1
DISPLAY error:  Invalid expression 
  Expression = topo

Could anyone suggest me!!!!

Thanking in advance
Dibas
HyARC,
Nagoya University
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