[ncl-talk] CNL read CALIPSO v4.51 data

[Dave Allured - NOAA Affiliate]

More diagnostics needed.  Someone please show output from:

NCL:
fh = addfile("CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf","r")
print (fh)

Linux:
h5dump -BH CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf


On Thu, Sep 4, 2025 at 3:23 PM Rick Brownrigg via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi,
>
> As that file resides on /glade, I was able to access it and duplicate the
> problem. I can print() that variable, but I can't load it into an NCL
> variable. Its rather large -- 699MB. Perhaps that's the problem?
> Interestingly, if I run "ncdump" on that file, I get:
>
>  ncdump
> /glade/derecho/scratch/zhifengy/data/experiment_input/doe_cloud_africa/CALIPSO/CAL_LID_L2_VFM-Standard-V4-51/test/CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf
>
> ncdump:
> /glade/derecho/scratch/zhifengy/data/experiment_input/doe_cloud_africa/CALIPSO/CAL_LID_L2_VFM-Standard-V4-51/test/CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf:
> NetCDF: Attempt to use feature that was not turned on when netCDF was built.
>
> Rick
>
>
> On Thu, Sep 4, 2025 at 3:16 PM Ehsan Taghizadeh via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Hi Zhifeng,
>>
>> Could you please add the following commands before your addfile command:
>>
>> exists =
>> isfilepresent("CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf")
>> print (exists)
>>
>> I wonder if your ncl script and the file are in the same place.
>> In case it returns True, could you please add the following commands
>> just after reading your file (after addfile command):
>>
>> names = getfilevarnames(
>> "CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf")
>> print (names)
>>
>>
>> *-----------------------------------------------------------------------------*
>> *Best regards,*
>> *Ehsan Taghizadeh*
>>
>>
>> On Thursday, September 4, 2025 at 01:37:05 PM PDT, Zhifeng Yang via
>> ncl-talk <ncl-talk at mailman.ucar.edu> wrote:
>>
>>
>> Hi all,
>>
>> I am using NCL 6.6.2 to read CALIPSO latitude, longitude, and
>> Feature_Classification_Flags variable from CAL_LID_L2_VFM-Standard-V4-51.
>>
>>   fh =
>> addfile("CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf","r")
>>    lath      = fh->Latitude(:, 0)
>>    lonh      = fh->Longitude(:, 0)
>>    vfmh      = fh->Feature_Classification_Flags
>>
>> However, I got the error below
>> fatal:HDF: An error occurred while attempting to read variable
>> (Feature_Classification_Flags) from file
>> (/glade/derecho/scratch/zhifengy/data/experiment_input/doe_cloud_africa/CALIPSO/CAL_LID_L2_VFM-Standard-V4-51/test/CAL_LID_L2_VFM-Standard-V4-51.2017-08-21T14-00-11ZD.hdf)
>>
>> Do you have any idea about this? Thanks,
>>
>> Best,
>> Zhifeng
>>
>
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