Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.

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

  • To: "H. Joe Lee" <hyoklee@xxxxxxxxxxxx>
  • Subject: Re: [netcdf-java] A list of HDF5 filters supported by netcdf-java dataset reader?
  • From: Christian Ward-Garrison <cwardgar@xxxxxxxx>
  • Date: Mon, 1 Jun 2015 18:52:14 -0600
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> 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.
>
> _______________________________________________
> netcdf-java mailing list
> netcdf-java@xxxxxxxxxxxxxxxx
> For list information or to unsubscribe, visit:
> http://www.unidata.ucar.edu/mailing_lists/
>
>
  • 2015 messages navigation, sorted by:
    1. Thread
    2. Subject
    3. Author
    4. Date
    5. ↑ Table Of Contents
  • Search the netcdf-java archives: