How to get binary array from a netcdf file

Question

I have a netcdf file which I am opening in memory and trying to get a binary representation of that file. Unfortunately, there does not seem to be a method that allows this.

I've tried using an ObjectOutputStream and a DataOutputStream but none seem to work:

// Nothing gets writen into baos
NetcdfFile file = NetcdfFile.openInMemory("C:\\testVIL.nc");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(baos);
N3outputStreamWriter w = new N3outputStreamWriter(file);
w.writeDataAll(out);
out.close();
byte[] byteArray = baos.toByteArray();
for ( byte b : byteArray ) {
 System.out.print( (char) b );
}

// netcdfFile is not seralizable
NetcdfFile file = NetcdfFile.openInMemory("C:\\testVIL.nc");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream( baos );
oos.writeObject( file );
byte[] byteArray = baos.toByteArray();
for ( byte b : byteArray ) {
  System.out.print( (char) b );
}

Can anyone suggest a way for me to get a binary representation for the netcdf file, I'm stumped!

Charlie Zender · Accepted Answer · 2014-09-03 02:36:50Z

1

The netCDF Operator (NCO) ncks will output binary

ncks -O -b binary.dat in.nc out.nc

For more details see

http://nco.sf.net/nco.html#bnr

answered Sep 3, 2014 at 2:36

Charlie Zender

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1 Comment

Dan Over a year ago

Thanks, but I'm looking to do this in memory and have no disk I/O

John Caron · Accepted Answer · 2015-10-19 21:32:06Z

0

NetCDF is already a binary representation, so not sure what you want.

Perhaps:

NetcdfFile file = NetcdfFile.openInMemory("C:\\testVIL.nc");
Variable v = ncfile.findVariable("varname");
Array data = v.read();
while(data.hasNext())
   System.out.printf("%f,", data.nextDouble() );

answered Oct 19, 2015 at 21:32

John Caron

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