Chris
>> One reason for this is that the CF standard does not address groups, so the
>> many of us that try to keep our file CF-compliant end up with netCDF3
>> compliant by default.
Regarding CF compliance and groups.
You can define CF-compliant attributes in any group.
For example, here's a case of a CDL file with the ":Conventions " attribute at
root (like happens for netCDF-3) and the same attribute at a group called g18
netcdf in_grp_3 {
:Conventions = "CF-1.0";
group: g18 {
:Conventions = "CF-1.0";
For any software that handles netCDF-4, then it's just a matter to read the CF
metadata at any group.
There are some examples of CDL files with these cases with NCO
http://nco.sourceforge.net/
Reference:
http://cfconventions.org/
-Pedro
----------------------
Pedro Vicente
pedro.vicente@xxxxxxxxxxxxxxxxxx
http://www.space-research.org/
----- Original Message -----
From: Chris Barker
To: Mary Haley
Cc: netcdfgroup@xxxxxxxxxxxxxxxx
Sent: Thursday, November 06, 2014 11:09 AM
Subject: Re: [netcdfgroup] what is status of netCDF3 vs netCDF4?
On Thu, Nov 6, 2014 at 9:31 AM, Mary Haley <haley@xxxxxxxx> wrote:
We have the same issue as Tim, in that we haven't been able to find many
good examples of NetCDF-4 for test purposes.
One reason for this is that the CF standard does not address groups, so the
many of us that try to keep our file CF-compliant end up with netCDF3 compliant
by default.
netcdf4 can still help with compression and chunking and all that, but the
hierarchical features are not used.
There is some movement toward a CF 2.* to address this, but it's only just
begun.
-Chris
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chris.Barker@xxxxxxxx
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