There were obviously some things I didn't grok about ncdump. I will revisit
that with your suggestions. Original file is netcdf3 and I want to write it
back out as netcdf3, so I will do some research on the proper use of ncdump. I
also didn't try using plain ncgen, either. So likely some user error involved.
Kevin Havener
-----Original Message-----
From: Dave Allured - NOAA Affiliate [mailto:dave.allured@xxxxxxxx]
Sent: Monday, January 23, 2017 2:28 PM
To: HAVENER, KEVIN F GS-12 USAF ACC 14 WS/WXED <kevin.havener@xxxxxxxxx>
Cc: netcdfgroup@xxxxxxxxxxxxxxxx
Subject: Re: [netcdfgroup] ncdump, then ncgen
Ncdump followed by ncgen generally works fine for me. Try using plain ncgen,
rather than ncgen3. Also try explicitly specifying the ncgen option to select
netcdf-3 file format. I recall that the default output format changed
occasionally with different versions of ncgen, so that might be your problem.
Also remember to use -p9,17 with ncdump, if you want to preserve full precision
from the original numeric values. Also use the -s option with ncdump, to get
the correct special metadata for all advanced netcdf formats (64-bit, netcdf-4,
and netcdf4-classic).
--Dave
On Mon, Jan 23, 2017 at 6:56 AM, HAVENER, KEVIN F GS-12 USAF ACC 14 WS/WXED
<kevin.havener@xxxxxxxxx <mailto:kevin.havener@xxxxxxxxx> > wrote:
If I understand correctly, I should be able to ncdump a netcdf to text
(CDL) then ncgen it back to a valid netcdf file. I tried this on a seemingly
valid netcdf3 file and ncgen3'd it, but the new file was not in any way like
the old one. In fact, it didn't even seem to be a valid netcdf3 any
longer--the file magic was incorrect. Did I completely misunderstand the
capabilities of the two programs? Or did I just not understand how to do the
process correctly?
Kevin Havener, DAFC, 14WS/WXED
