Re: [netcdf-java] A list of HDF5 filters supported by netcdf-java dataset reader?

• To: Christian Ward-Garrison <cwardgar@xxxxxxxx>
• Subject: Re: [netcdf-java] A list of HDF5 filters supported by netcdf-java dataset reader?
• From: Joe Lee <hyoklee@xxxxxxxxxxxx>
• Date: Tue, 2 Jun 2015 16:03:50 +0000
• Authentication-results: spf=none (sender IP is ) smtp.mailfrom=hyoklee@xxxxxxxxxxxx;

Thanks Christian for confirming it.  It helps me to design interoperable HDF5 
data product.

From: Christian Ward-Garrison [mailto:cwardgar@xxxxxxxx]
Sent: Monday, June 01, 2015 7:52 PM
To: Joe Lee
Cc: Java NetCDF
Subject: Re: [netcdf-java] A list of HDF5 filters supported by netcdf-java 
dataset reader?

Hello H. Joe Lee,

I am not the original author of the HDF5 Java code, but looking at [1] and [2], 
it's pretty clear that netcdf-java only supports gzip, shuffle, and fletcher32. 
It seems like there were also plans for "szip", "nbit", and "scaleoffset", but 
that functionality hasn't been implemented.
Cheers,
Christian

[1] 
https://github.com/Unidata/thredds/blob/v4.6.1/cdm/src/main/java/ucar/nc2/iosp/hdf5/H5header.java#L3632
[2] 
https://github.com/Unidata/thredds/blob/v4.6.1/cdm/src/main/java/ucar/nc2/iosp/hdf5/H5tiledLayoutBB.java#L191

On Wed, May 27, 2015 at 9:39 AM, H. Joe Lee 
<hyoklee@xxxxxxxxxxxx<mailto:hyoklee@xxxxxxxxxxxx>> wrote:
Hi,

  I'm looking for information about the full list of HDF5 filters [1]
supported by netcdf-java. I checked the code [2] and it seems that
netcdf-java supports fletcher32, shuffle, and gzip. Does it also
support scale-offset filter / n-bit / and custom filter like LZF [3]
which is used in h5py?

[1] https://www.hdfgroup.org/HDF5/examples/api18-c.html
[2] 
https://github.com/Unidata/thredds/blob/76c0f69dacf1f09314f73034b5d5e5fa82353f94/cdm/src/main/java/ucar/nc2/iosp/hdf5/H5tiledLayoutBB.java
[3] https://www.hdfgroup.org/services/contributions.html#filters

--
HDF Product Designer: Ideate interoperable Bigdata for Citizen Science and IoT.

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• References:
  • [netcdf-java] A list of HDF5 filters supported by netcdf-java dataset reader?
    • From: H. Joe Lee
  • Re: [netcdf-java] A list of HDF5 filters supported by netcdf-java dataset reader?
    • From: Christian Ward-Garrison