Re: [galeon] [WCS-1.2.swg] Teleconference Agenda - December 10, 2008

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 I'm attempting to capture some of these issues related to the collections of 
non-gridded data

(I note that LiDAR point clouds fall into this category.)

-mpg


From: wcs-1.2.swg-bounces+mpg=lizardtech.com@xxxxxxxxxxxxxxxxxxxxxxxx 
[mailto:wcs-1.2.swg-bounces+mpg=lizardtech.com@xxxxxxxxxxxxxxxxxxxxxxxx] On 
Behalf Of Ben Domenico
Sent: Wednesday, December 10, 2008 3:08 AM
To: Steven Keens
Cc: wcs-1.2.swg@xxxxxxxxxxxxxxxxxxxxxxxx; Unidata GALEON; Ted.Habermann@xxxxxxxx
Subject: Re: [WCS-1.2.swg] Teleconference Agenda - December 10, 2008

Hi Steven et al.,

Following up on an action item for me at the Coverages session at the Valencia 
Technical Committee meetings, I'd like to mention two GALEON-related items.

First, we are working on a WCS extension for CF-netCDF encoding. The GALEON 
group made a a few valuable suggestion for augmenting the draft. encoding spec 
that was circulated by Stefano Nativi to the GALEON email list. Those changes 
are being incorporated into the next draft that will be submitted to the SWG. 
It also seems the draft should be recast in terms of the encoding extensions 
template that is being developed.

Second, the topic of non-gridded coverages came up at both the joint session 
with SWE and the Coverages session at the TC meetings.  In GALEON, the issue of 
how to deliver non-gridded observational data is an important question. The 
relationship to WCS is not entirely clear, but GALEON 1 showed the value of a 
simple WCS use case in which the client defines a 3D bounding box, a time 
frame, and a property (temperature, pressure, etc.) and gets back a coverage 
encoded in CF-netCDF. However, with WCS we are currently constrained to 
coverages that are gridded at regularly spaced points in some Coordinate 
Reference System. In the GALEON community, this works for some forecast model 
output and some geostationary satellite imagery. A key question facing GALEON 
now is how to deliver the wide variety of collections of observational data via 
a similarly straightforward request -- based on OGC and ISO standards.  And 
specifically, might WCS evolve (perhaps via extensions to the core) so that it 
would a viable protocol?

For the true gluttons for punishment among you, I'm attempting to capture some 
of these issues related to the collections of non-gridded data in an airport 
weather use case at:

http://sites.google.com/site/galeonteam/airport-weather-use-case-and-standards

As you will note, this is a very rough compilation drawn from presentations by 
several GALEON team members. Many standard specifications come into play -- WCS 
possibly among them. As time permits, I plan to refine this document into 
something more complete and coherent, but I think it captures the salient 
issues even in its current form.

-- Ben



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