[ncl-talk] hdf5 file in ncl

[Debasish Hazra]

Thanks Mary, adding "he2" suffix at the end helped. I have another
quaetion  to ask on this, how to assign 1 dimesnional lat and lon to the
variable field ? So far, I have :

            oc_aod1 = w->Aerosol_Optical_Depth_Ocean_Aqua_AOD

            lat1 = w->Latitude_Ocean_Aqua_AOD
            lon1 = w->Longitude_Ocean_Aqua_AOD

PrintVarSummary of them :

Variable: oc_aod1
Type: float
Total Size: 15116 bytes
            3779 values
Number of Dimensions: 1
Dimensions and sizes:   [Nobs_Ocean_Aqua_AOD | 3779]
Coordinates:
Number Of Attributes: 2
  _FillValue :  -999
  hdfeos_name : Aerosol_Optical_Depth
Variable: lat1
Type: float
Total Size: 15116 bytes
            3779 values
Number of Dimensions: 1
Dimensions and sizes:   [Nobs_Ocean_Aqua_AOD | 3779]
Coordinates:
Number Of Attributes: 4
  _FillValue :  -999
  hdfeos_name : Latitude
  units :       degrees_north
  long_name :   latitude
Variable: lon1
Type: float
Total Size: 15116 bytes
            3779 values
Number of Dimensions: 1
Dimensions and sizes:   [Nobs_Ocean_Aqua_AOD | 3779]
Coordinates:
Number Of Attributes: 4
  _FillValue :  -999
  hdfeos_name : Longitude
  units :       degrees_east
  long_name :   longitude

Variable has one dimension, how do I make lat/lon grid for visualization ?

Thanks.
Debasish

On Tue, Nov 14, 2017 at 5:57 PM, Mary Haley <haley at ucar.edu> wrote:

> Hi Debasish,
>
> This is an HDF-EOS2 file, which you can see if you do an ncl_filedump on
> the file and look at the top part of the output:
>
> Variable: f
> Type: file
> filename:       MYDAODHD.A2017305.0000.061.NRT
> path:   MYDAODHD.A2017305.0000.061.NRT.hdf
>    file global attributes:
>       HDFEOSVersion : HDFEOS_V2.19
>
> Try adding ".he2" to the end of the filename in your script. This will
> tell NCL to try opening the file as an HDF-EOS2 file:
>
>  diri = "./November2017/1/"
>  fili = "MYDAODHD.A2017305.0000.061.NRT.hdf.*he2*"
> ​ ​
> pthi = diri+fili
>  w = addfile(pthi,"r")
>
> It is not necessary to rename the file itself. The "addfile" command will
> first look for a file called "MYDAODHD.A2017305.0000.061.NRT.hdf.he2",
> and if it can't find that, it will look for the file
> "MYDAODHD.A2017305.0000.061.NRT.hdf", but will try to open it as an
> HDF-EOS2 file.
>
> Once you do this, the
> ​file will look much more reasonable.
>
> --Mary
>
> On Tue, Nov 14, 2017 at 2:20 PM, Debasish Hazra <debasish.hazra5 at gmail.com
> > wrote:
>
>> Hi,
>>
>> I am trying to read attached HDF5 file using ncl v6.4 but not able to
>> extract data attributes from "Group".
>>
>>  diri = "./November2017/1/"
>>      fili = "MYDAODHD.A2017305.0000.061.NRT.hdf"
>>
>>             pthi = diri+fili
>>             w = addfile(pthi,"r")
>>             mod1 = "Aerosol_Optical_Depth"
>>             Latitude = "Latitude"
>>             Longitude = "Longitude"
>>             print(mod1)
>>              gp = w->GeoField
>>
>> Variable: mod1
>> Type: string
>> Total Size: 8 bytes
>>             1 values
>> Number of Dimensions: 1
>> Dimensions and sizes:   [1]
>> Coordinates:
>> (0)     Aerosol_Optical_Depth
>> fatal:["Execute.c":6397]:variable (GeoField) is not in file (w)
>>
>> Not sure how to proceed with that. Any help is appreciated.
>>
>> Debasish
>>
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