[ncl-talk] hdf5 file in ncl

[Adam Phillips]

Hi Debasish,
See the first station data example here:
http://www.ncl.ucar.edu/Applications/station.shtml
Hope that helps!
Adam

On Wed, Nov 15, 2017 at 8:33 AM, Debasish Hazra <debasish.hazra5 at gmail.com>
wrote:

> 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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>>
>
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>


-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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