Can you post at least a fragment of code showing how you tried to do the
update
using netcdf-java?
=Dennis Heimbigner
Unidata
On 3/6/2018 11:55 AM, Carlow, Christian R wrote:
I sent a message to support yesterday but I haven't gotten a response
so I figured I would repost here.
I'm attempting to update global attribute values multiple issues were
encountered.
First I tried using NetcdfWriter of netcdf-java 4.6.9 but it was threw
errors about redefine mode not being set but once I set it another
error was thrown by a Native Windows Filesystem call. I tested on
Linux and got a similar error. I suspect the redefine mode logic was
attempting rename a file that was considered open or inexistent.
Eventually I got the files to update after installing the Netcdf C
library for handling netcdf4 but it ended up truncating the attribute
value I was trying to set. After debugging I determined that the
netcdf4 logic wasn't being used for updating netcdf3 files.
I found an article where someone recommended using nco to update files
(nco.sourceforge.net) but after debugging the functionality I
determined it ultimately was just calling the Native C functions
(nc_redef, nc_set_att_text, etc) so I figured it would be better to
just call those commands directly from java.
However, the Nc4prototypes.java file is missing the nc_redef
function. Was that function accidentally left out or was it intentional.
I'd like to using the NetcdfWriter class for handling updates but it
doesn't seem to provide the same power as the Native C functions.
I've already tested a C application using the Native functions and it
updated the attribute values of netcdf3 files fine without truncating.
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