[gradsusr] MODIS CLOUD TOP TEMPERATURE

[Joshua Ngaina]

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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