Yes, I had the same issue when I was writing Minecraft World map generation
code from HDF-EOS [1]:
nc = NetcdfDataset.openFile(filename, null);
// Variable v = nc.findVariable("l3m_data"); // for Aquarius product
// Please note that "Data Fields" have underscore. HDF5 does not
have it.
// Variable v =
nc.findVariable("/HDFEOS/GRIDS/ColumnAmountO3/Data_Fields/TerrainHeight");
Variable v =
nc.findVariable("/Northern_Hemisphere/Data_Fields/Extent");
Variable v2 =
nc.findVariable("/Southern_Hemisphere/Data_Fields/Extent");
[1]
https://github.com/hyoklee/Glowstone/blob/master/src/main/java/net/glowstone/GlowWorld.java
From: netcdf-java-bounces@xxxxxxxxxxxxxxxx
[mailto:netcdf-java-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Ryan May
Sent: Tuesday, January 13, 2015 9:44 AM
To: Antonio Rodriges
Cc: netcdf-java@xxxxxxxxxxxxxxxx
Subject: Re: [netcdf-java] Problem reading HDF files
(Sending again to make sure the list gets it).
Antonio,
Thanks for the information, and sorry it's taken so long to get back--I blame
the holidays and the AMS meeting.
I've found the cause of the problem: the "Data Fields" group in the hdf5 file
is getting converted in netcdf-java to "Data_Fields". So as a workaround, you
could get it working by making sure any spaces in the path variable (or at
least the groups) are replaced with "_". I still need to find out if this is
deliberate behavior in netcdf-java for some reason, or just a bug.
On Tue, Dec 30, 2014 at 1:13 PM, Antonio Rodriges
<antonio.rrz@xxxxxxxxx<mailto:antonio.rrz@xxxxxxxxx>> wrote:
Ryan,
The path is
/HDFEOS/GRIDS/ColumnAmountNO2/Data Fields//ColumnAmountNO2TropCloudScreened
and the HDF5 file is attached. There are also HDF4 files with the same problem
This worked fine under netcdf-4.2 but now I need new features
introduced in later versions so I consider switching to 4.3 at least
or higher
2014-12-30 20:57 GMT+03:00 Ryan May <rmay@xxxxxxxx<mailto:rmay@xxxxxxxx>>:
> Antonio,
>
> It would be helpful to see a sample file as well as the value of the path
> variable in order to understand the problem.
>
> Ryan
>
> On Sun, Dec 28, 2014 at 9:25 AM, Antonio Rodriges
> <antonio.rrz@xxxxxxxxx<mailto:antonio.rrz@xxxxxxxxx>>
> wrote:
>>
>> Hello,
>>
>> the code
>>
>> String path = groupInFile + SUBDATASETS_GROUP_DELIMITER +
>> nameInGroup;
>> Variable findVariable = file.findVariable(path);
>>
>> Worked with netcdf-4.2 Java lib but does not with netcdf-4.3 and 4.5
>> (returns findVariable = null)
>> What is the problem?
>>
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>>
>
>
>
> --
> Ryan May
> Software Engineer
> UCAR/Unidata
> Boulder, CO
--
Ryan May
Software Engineer
UCAR/Unidata
Boulder, CO
