display hgt.200812.nc

[Emily]

Hi group members,

I face a problem when I display 500 hpa geopotential height chart, it shows wrong data.

My gs file is:
'reinit'
'open d:\gradsfile\ncdata\hgt200812.ddf'
'set grads off'
'set grid off'
'set lon 220 310'
'set lat 20 60'
'set lev 500'
'set time 09z28dec2008'
'd hgt'
====================
My ddf is as below:
DSET d:\gradsfile\ncdata\hgt.200812.nc
DTYPE netcdf
TITLE NARR 4D field Lambert Conformal Conic projection
UNDEF 32766 missing_value
UNPACK scale_factor add_offset
PDEF 349 277 lcc 1 -145.5 1 1 50 50 -107 32463.41 32463.41
XDEF 615 linear 150 0.3333
YDEF 255 linear 2 0.3333
ZDEF 29 levels 1000, 975, 950, 925, 900, 875, 850, 825, 800, 775, 750, 725, 700,
 650, 600, 550, 500, 450, 400, 350, 300, 275, 250, 225, 200, 175, 150, 125, 100
tdef 248 linear 00:00z01dec2008 3hr
vars 3
hgt 29 t,z,y,x  geopotential_height
lat=>glat 0 y,x Latitude
lon=>glon 0 y,x Longitude
endvars
=============
My grads version: Grads 2.0 a3,
window xp

I notice that the contours laber values are like -25900, -25800..... I think the value is wrong. Then I check ncdump information, the hgt value from ncdump also shows like -25900,.....

Is there some one knowing what wrong with this?Thanks very much.

Regards,

Emily
York University, Toronto, Canada.
 

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