Re: [netcdf-java] Write files with 64-bit long data types

  • To: Sean Arms <sarms@xxxxxxxx>
  • Subject: Re: [netcdf-java] Write files with 64-bit long data types
  • From: Hanns Holger Rutz <rutz@xxxxxx>
  • Date: Fri, 30 Jun 2017 19:29:56 +0200
I see -- and it's not possible to draw them in as standard Maven
dependencies for the correct platforms? I think this works with other
Java-C-bridging libraries such as OpenCV, for example:

http://search.maven.org/#search%7Cga%7C1%7Copencv

you have there linux-armhf.jar, linux-x86.jar,  linux-x86_64.jar,
macosx-x86_64.jar, windows-x86.jar etc.

would it be possible to do that with NetCDF as well?

best, .h.h.


On 30/06/17 19:10, Sean Arms wrote:
> Greetings!
> 
> Currently, the only way to write netCDF-4 files is through the C interface:
> 
> https://www.unidata.ucar.edu/software/thredds/current/netcdf-java/reference/netcdf4Clibrary.html
> 
> As it stands, there isn't a pure implementation of HDF5 outside of the
> C library, so pretty much everyone who writes netCDF needs to go
> through the C library.
> 
> Sean
> 
> 
> On Fri, Jun 30, 2017 at 9:55 AM, Hanns Holger Rutz <rutz@xxxxxx> wrote:
>> p.s. I use
>>
>>     "edu.ucar" % "netcdf4" % "4.6.10"
>>
>> as library. perhaps I need to change this or use a different one?
>>
>>
>> On 30/06/17 17:51, Hanns Holger Rutz wrote:
>>> hi,
>>>
>>> so far I have used this
>>>
>>>     nc2.NetcdfFileWriter.createNew(Version.netcdf3, location, null)
>>>
>>> this creates files with this type of header:
>>>
>>> 00000000  43 44 46 01 00 00 00 00  00 00 00 0a 00 00 00 04
>>> |CDF.............|
>>> 00000010  00 00 00 04 54 69 6d 65  00 00 00 b4 00 00 00 09
>>> |....Time........|
>>> 00000020  4c 6f 6e 67 69 74 75 64  65 00 00 00 00 00 00 0c
>>> |Longitude.......|
>>> 00000030  00 00 00 08 4c 61 74 69  74 75 64 65 00 00 00 24
>>> |....Latitude...$|
>>> 00000040
>>>
>>> now I have a problem where I have to include 64-bit long values, and
>>> this seems to be unsupported: "long not support in netcdf-3"
>>>
>>> So I tried chaing  this to
>>>
>>>     nc2.NetcdfFileWriter.createNew(Version.netcdf4, location, null)
>>>
>>> now this gives me error that it wants to use C (???) libraries:
>>>
>>>     Nc4Iosp: NetCDF-4 C library not present (jna_path='/usr/local/lib/',
>>> libname='netcdf').
>>>
>>> What should I do? I need a solution that is cross-platform with
>>> libraries pulled from a maven repository, no matter whether user runs
>>> Linux, Windows, Mac.
>>>
>>> Can I get a pure Java solution that supports 64-bit long? How?
>>>
>>> thanks, .h.h.
>>>
>>>
>>>
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>>
>>
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