[gradsusr] MODIS CLOUD TOP TEMPERATURE

[Jennifer Adams]

You probably need an alias in your variable declaration.

 SDF_name=>grads_name 
SDF_name must exactly match the data variable name in the SDF -- it may contain uppercase letters and non-alpha-numeric characters. The grads_name is an alias for SDF_name and must be less than 16 characters, start with an alphabetic character, and cannot contain any upper case letters or non-alpha-numeric characters. The aliasing of variable names may be omitted (i.e., "SDF_name=>" does not precede grads_name) if the SDF_name already meets the criteria for GrADS variable names listed above.

--Jennifer


On May 26, 2014, at 3:38 AM, Joshua Ngaina wrote:

> Dear Jennifer
> 
> I added 'dtype netcdf' in the descriptor file and I when I try to display I get the error 
> 
> ga-> d cloud_top_tempe
> Error: Variable cloud_top_tempe not in netcdf file
> Data Request Error:  Error for variable 'cloud_top_tempe'
>   Error ocurred at column 1
> DISPLAY error:  Invalid expression 
>   Expression = cloud_top_tempe
> 
> However, If I open individual files, they work okay. 
> 
> joshua
> 
> 
> 
> On Sun, May 25, 2014 at 4:36 AM, Jennifer Adams <jma at cola.iges.org> wrote:
> Add 'dtype netcdf' to your descriptor file … that should fix it. --Jennifer
> 
> On May 24, 2014, at 4:54 PM, Joshua Ngaina wrote:
> 
>> Dear All,
>> 
>> I am extracting cloud top temperature  from MODIS satellite. I have
>> written a descriptor file as shown below.
>> DSET  ^mod%d2.nc
>> TITLE Aerosol Optical Depth
>> OPTIONS template
>> UNDEF -9999
>> XDEF 360 LINEAR 0.0 1
>> YDEF 180 LINEAR -89.5 1
>> zdef 1 linear 0 1
>> TDEF 14 LINEAR 0Z10jan2001 1dy
>> VARS      1
>> cloud_top_tempe 0 y,x Cloud Top Temperature: Mean
>> ENDVARS
>> 
>> Checking control file information, the TDEF seems different
>> ga-> q ctlinfo
>> dset mod%d2.nc
>> title Aerosol Optical Depth
>> undef -9999
>> xdef 360 linear 0 1
>> ydef 180 linear -89.5 1
>> zdef 1 linear 0 1
>> tdef 14 linear 00Z10JAN2001 1440mn
>> vars 1
>> cloud_top_tempe  0  y,x  Cloud Top Temperature: Mean
>> endvars
>> 
>> The attributes of my file is as shown
>> ga-> q attr
>> No Descriptor Attributes for File 1 :
>> 
>> Native Attributes for File 1 :
>> global String Conventions CF-1.0
>> lat Int32 scale 0
>> lat Float32 stride 1
>> lat String gridReference edge
>> lat String standard_name latitude
>> lat Float32 endValue 90
>> lat String units degrees_north
>> lat String scaleType linear
>> lat Float32 startValue -90
>> lat Int32 size 180
>> lon Int32 scale 0
>> lon Float32 stride 1
>> lon String gridReference edge
>> lon String standard_name longitude
>> lon Float32 endValue 180
>> lon String units degrees_east
>> lon String scaleType linear
>> lon Float32 startValue -180
>> lon Int32 size 360
>> cloud_top_tempe Float32 _FillValue -9999
>> cloud_top_tempe String Quality_Assurance_Data_Set None
>> cloud_top_tempe Float32 scale_factor 1
>> cloud_top_tempe Float32 add_offset 0
>> cloud_top_tempe String long_name Cloud Top Temperature: Mean
>> cloud_top_tempe String Statistic_Type Simple
>> cloud_top_tempe String units Degree
>> cloud_top_tempe String Aggregation_Data_Set None
>> cloud_top_tempe Int32 valid_range 0,20000
>> cloud_top_tempe String Included_Level_2_Nighttime_Data True
>> cloud_top_tempe String Derived_From_Level_2_Data_Set Cloud_Top_Temperature
>> cloud_top_tempe String Level_2_Pixel_Values_Read_As Real
>> cloud_top_tempe String structureType Grid
>> cloud_top_tempe String unitsCategory temperature
>> 
>> However, the values I get from a point are as shown. Note that some of
>> these values are quite extreme.
>> -1.29021e-23
>> -6.92459e+32
>> 33170.3
>> 1.98182e+11
>> 2.08584e-26
>> -5.06712e+26
>> 3.17729e+23
>> -2.23413e-29
>> 0.0676561
>> 2.40895e-26
>> -8.06725e-36
>> 5.39458e+17
>> -1.05303e-10
>> 57747.3
>> 
>> Can anyone help me point out the error ?
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> 
> --
> Jennifer M. Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> 111 Research Hall, Mail Stop 2B3
> George Mason University
> 4400 University Drive
> Fairfax, VA 22030 
> 
> 
> 
> 
> 
> 
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--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 





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