Bob,
here is an excerpt from the source (slightly reformatted):
public enum Version {
netcdf3(".nc"), // java iosp
netcdf4(".nc4"), // jni netcdf4 iosp mode = NC_FORMAT_NETCDF4
netcdf4_classic(".nc"), // jni netcdf4 iosp mode = NC_FORMAT_NETCDF4_CLASSIC
netcdf3c(".nc"), // jni netcdf4 iosp mode = NC_FORMAT_CLASSIC (nc3)
netcdf3c64(".nc"), // jni netcdf4 iosp mode = NC_FORMAT_64BIT (nc3
64 bit)
ncstream(".ncs"); // ncstream iosp
From this it looks to me like netcdf3 and netcdf3c will both write
NetCDF-3 files. The difference is that netcdf3 will use the pure Java
implementation whereas netcdf3c will use JAI to call the native
(compiled C) libnetcdf4 with options to write a 32-bit-offset NetCDF-3
file (just like libnetcdf 3.5.1 and earlier). These will in theory
produce the same output but might have slight differences. The pure Java
version will be most portable, and the native libnetcdf4 version may be
a much faster.
Yes, these docs could be better. Library users should not have to read
the source.
Kind regards,
Ben.
On 29/04/16 10:16, Bob Simons - NOAA Federal wrote:
Can you please add more descriptive descriptions of the netcdf version
options at
http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/javadoc/ucar/nc2/NetcdfFileWriter.Version.html
?
Notably, what is the difference between netcdf3 and netcdf3c?
Thank you.
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Ben Caradoc-Davies <ben@xxxxxxxxxxxx>
Director
Transient Software Limited <http://transient.nz/>
New Zealand
