Re: [galeon] [WCS-2.0.swg] CF-netCDF standards initiatives

I'd say the same thing about GML - it's already possible to use GML to provide 
a canonical encoding linked to an underlying conceptual model AND xlink to 
netCDF for the actual content.

 

Andrew

 

From: wcs-2.0.swg-bounces+andrew.woolf=stfc.ac.uk@xxxxxxxxxxxxxxxxxxxxxxxx 
[mailto:wcs-2.0.swg-bounces+andrew.woolf=stfc.ac.uk@xxxxxxxxxxxxxxxxxxxxxxxx] 
On Behalf Of Robin, Alexandre
Sent: 20 August 2009 09:16
To: Max Martinez; Ben Domenico; Peter Baumann
Cc: Unidata Techies; Unidata GALEON; Carl Reed; wcs-2.0.swg
Subject: Re: [WCS-2.0.swg] CF-netCDF standards initiatives

 

FYI,

 

SWE Common can serve to send very efficiently packaged datasets (binary, 
compressed binary) just like NetCDF does while providing robust metadata 
describing the datasets.

These datasets can be N-D grid coverages, discrete coverages, or any other kind 
of sensor observations or model results.

 

The point for us to build SWE Common rather than just reusing NetCDF was to 
support efficient random access in huge datasets and real time streaming data 
(which NetCDF is not designed for) with a single model.

Both cases are supported and I am pretty sure we can generate a SWE Common 
encoded binary stream that is byte-to-byte compatible with the data section of 
a NetCDF file.

 

Developing a module for the NetCDF API dealing with SWE Common would be quite 
trivial thanks to the harmonization work we have already done.

 

Regards,

 

-------------------------------------------------

Alexandre Robin

Spot Image, Web and E-Business

Tel: +33 (0)5 62 19 43 62

Fax: +33 (0)5 62 19 43 43

http://www.spotimage.com <http://www.spotimage.com> 

Before printing, think about the environment

 

 

________________________________

De : Robin, Alexandre 
Envoyé : jeudi 20 août 2009 10:01
À : 'Max Martinez'; Ben Domenico; Peter Baumann
Cc : Unidata Techies; Unidata GALEON; wcs-2.0.swg; 'Carl Reed'
Objet : RE: [WCS-2.0.swg] CF-netCDF standards initiatives

 

Ben,

 

I hope we don't have to define a NEW standard but rather work with you to see 
how we can treat your use cases with SWE Common (which already incorporates 
some NetCDF concepts and is VERY close to NcML).

I already looked at the issue and writing a converter (even the 'on the fly' 
kind) between the two formats should be no problem at all.

 

Bringing legacy formats (be them pseudo-defacto standards of a community) into 
OGC is NOT going to help interoperability across domains...

 

Regards,

 

-------------------------------------------------

Alexandre Robin

Spot Image, Web and E-Business

Tel: +33 (0)5 62 19 43 62

Fax: +33 (0)5 62 19 43 43

http://www.spotimage.com <http://www.spotimage.com> 

Before printing, think about the environment

 

 

________________________________

De : wcs-2.0.swg-bounces+alexandre.robin=spotimage.fr@xxxxxxxxxxxxxxxxxxxxxxxx 
[mailto:wcs-2.0.swg-bounces+alexandre.robin=spotimage.fr@xxxxxxxxxxxxxxxxxxxxxxxx]
 De la part de Max Martinez
Envoyé : jeudi 20 août 2009 03:19
À : Ben Domenico; Peter Baumann
Cc : Unidata Techies; Unidata GALEON; wcs-2.0.swg
Objet : Re: [WCS-2.0.swg] CF-netCDF standards initiatives

 

Ben,

 

What exactly is an "OGC binary encoding standard"? Is CF-netCDF attempting to 
be the first of its kind or are there other examples?

 

Max

 

________________________________

From: wcs-2.0.swg-bounces+max.martinez=erdas.com@xxxxxxxxxxxxxxxxxxxxxxxx 
[mailto:wcs-2.0.swg-bounces+max.martinez=erdas.com@xxxxxxxxxxxxxxxxxxxxxxxx] On 
Behalf Of Ben Domenico
Sent: Wednesday, August 19, 2009 1:19 PM
To: Peter Baumann
Cc: Unidata Techies; Unidata GALEON; wcs-2.0.swg
Subject: [WCS-2.0.swg] CF-netCDF standards initiatives

 

Hello,

 

Some confusion has resulted from the fact that we are pursuing two parallel 
efforts at standardizing CF-netCDF within the OGC.  

 

The first initiative began a few years ago.  The goal is to establish CF-netCDF 
as an extension standard for WCS encoding of data in binary form.   Stefano 
Nativi just sent out an email announcing the latest revision of the proposed 
"discussion paper" on that topic.  This will be discussed and hopefully voted 
on at the September/October TC meeting.

 

At the same time, we have a new initiative to establish CF-netCDF as a separate 
 OGC binary encoding standard.    This approach will result in a binary 
encoding which can be used with different access protocols, e.g., WFS or SOS as 
well as WCS.   Of course, in the long run, our objective is to tie the two 
approaches together, but we do not want to impede progress on either right now 
by making them formally interdependent.  A very rough draft of the core 
standard for CF-netCDF is on the GALEON wiki at:

 

http://sites.google.com/site/galeonteam/Home/cf-netcdf-candidate-standard

 

As you can see, the draft for the OGC core is based on the NASA Earth Science 
Data System standard (NASA ESDS-RFC-011v1.00). We hope to have this candidate 
standard in the proper OGC template form by the September/October TC and will 
have an ad-hoc session at which we plan to establish a SWG.   Since there is 
already a large community of practice, endorsement by other standards groups 
(NASA and NOAA in the US), and solid reference implementations, we hope to move 
forward quickly with this standard.

 

We would very much like to have as many liaisons as possible between the WCS 
and CF-netCDF working groups to ensure that they are kept in harmony.

 

-- Ben


-- 
Scanned by iCritical.