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

[Rick Brownrigg]

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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