Adding a service to a remotely served dataset

[Ethan Davis]

Hi Roy,

Looks like you are referencing NCDC catalogs rather than serving the 
datasets yourself. So, users would get redirected to the NCDC server and 
access the data through the NCDC server. So, as things stand, NCDC would 
have to add the WCS service.

You could point to each NCDC dataset with an NcML wrapper and actually 
serve the data from your server rather than redirecting to NCDC. If you 
did that, you could add the WCS service. However, the performance 
wouldn't be as good as direct from NCDC.

I'm afraid I don't know about the WCS request for a time range. So, I'll 
leave that for others to answer.

Ethan

Roy Mendelssohn wrote:
> Hi Ethan:
>
> I am not certain I follow.  To be more specific, look at:
>
> http://oceanwatch.pfeg.noaa.gov/thredds/catalog.html
>
> and scroll down to the datasets " Remote test to Nomads THREDDS 
> catalog", which is actually on a THREDDS server on an NCDC computer.  
> They are remotely served through catalogs.  Can we add the WCS service 
> on our end, or will it only work if NCDC adds the WCS service.
>
> While I have your attention, I have not been able to get a straight 
> answer if there is a way to send the WCS request to get a time range, 
> rather than a single time, and if so what is the syntax for that.
>
> Thanks,
>
> -Roy
>
> On Jul 6, 2007, at 11:24 AM, Ethan Davis wrote:
>
>> Hi Roy,
>>
>> If you are actually serving the dataset through your server (which it 
>> sounds like you are since you mention existing NcML for the dataset) 
>> rather than providing a link in your catalog to the remote server, I 
>> believe you can simply add the WCS service to your TDS configuration 
>> catalog and serve the data via WCS. It shouldn't require any changes 
>> to the NcML, just to the service element in the catalog.
>>
>> Of course, this depends on the dataset meeting the WCS server 
>> requirements, e.g., evenly spaced grid.
>>
>> I'm not sure how it would perform. But I'll leave it for John to 
>> respond on that.
>>
>> Ethan
>>
>> Roy Mendelssohn wrote:
>>> Hi:
>>>
>>> The question for today is if our TDS is "serving" a dataset 
>>> remotely  (ie. the remote site has their own TDS and we just link 
>>> indirectly to it), can we add a service to our version that they 
>>> don't have  (just like we can aggregate a remote dataset that is not 
>>> aggregated).  In particular the remote dataset only has an OPeNDAP 
>>> response, but we would like to be able to respond to both an OPeNDAP 
>>> and a WCS response.
>>>
>>> If we change our NcML appropriately, will that work?
>>>
>>> Thanks in advance,
>>>
>>> -Roy
>>>
>>> **********************
>>> "The contents of this message do not reflect any position of the 
>>> U.S. Government or NOAA."
>>> **********************
>>> Roy Mendelssohn
>>> Supervisory Operations Research Analyst
>>> NOAA/NMFS
>>> Environmental Research Division   Southwest Fisheries Science Center
>>> 1352 Lighthouse Avenue
>>> Pacific Grove, CA 93950-2097
>>>
>>> e-mail: Roy.Mendelssohn at noaa.gov (Note new e-mail address)
>>> voice: (831)-648-9029
>>> fax: (831)-648-8440
>>> www: http://www.pfeg.noaa.gov/
>>>
>>> "Old age and treachery will overcome youth and skill."
>>>
>>>
>>>
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>>
>> --Ethan R. Davis                                Telephone: (303) 
>> 497-8155
>> Software Engineer                             Fax:       (303) 497-8690
>> UCAR Unidata Program Center                   E-mail:    edavis at ucar.edu
>> P.O. Box 3000
>> Boulder, CO  80307-3000                       
>> http://www.unidata.ucar.edu/
>> --------------------------------------------------------------------------- 
>>
>>
>>
>
> **********************
> "The contents of this message do not reflect any position of the U.S. 
> Government or NOAA."
> **********************
> Roy Mendelssohn
> Supervisory Operations Research Analyst
> NOAA/NMFS
> Environmental Research Division   
> Southwest Fisheries Science Center
> 1352 Lighthouse Avenue
> Pacific Grove, CA 93950-2097
>
> e-mail: Roy.Mendelssohn at noaa.gov (Note new e-mail address)
> voice: (831)-648-9029
> fax: (831)-648-8440
> www: http://www.pfeg.noaa.gov/
>
> "Old age and treachery will overcome youth and skill."
>
>

-- 
Ethan R. Davis                                Telephone: (303) 497-8155
Software Engineer                             Fax:       (303) 497-8690
UCAR Unidata Program Center                   E-mail:    edavis at ucar.edu
P.O. Box 3000
Boulder, CO  80307-3000                       http://www.unidata.ucar.edu/
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