[gradsusr] Accessing data chunks via GrADS data server

[Jennifer Adams]

I have seen this message before, my remedy would be shut down the GDS, clear the cache, and then restart it. Perhaps you can suggest this to whoever is the owner of http://metserver:9090. 
--Jennifer

On Jun 1, 2014, at 2:10 AM, Marsh, Kieren [FGUAE] wrote:

> Jennifer
>  
> Thanks for the reply.
>  
> I have been using the method you describe however, the GrADS Data Server I am accessing (I don’t administer it) is breaking my request midway through GrADS defining process. The server admin is telling me the GDS is reporting that I am making too many data requests (subset operation failed; creation of child process failed    -  Cannot run program "nice": error=24, Too many open files).
>  
> Obviously you’re not in receipt of all the facts but as far as I can tell everything is being done correctly on my side. Can you think of any possible causes of this?
>  
> Thanks again for all your efforts.
>  
> Kieren Marsh
> 
> 
>  
> From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Jennifer Adams
> Sent: 28 May 2014 23:18
> To: GrADS Users Forum
> Subject: Re: [gradsusr] Accessing data chunks via GrADS data server
>  
>  
> On May 27, 2014, at 8:45 PM, Marsh, Kieren [FGUAE] wrote:
> 
> 
> Can someone please explain to me how the bracketed notation works to extract data from a GDS. By this I mean the following:
>  
> http://metserver:9090/dods/neww3/neww3.00z.ascii?htsgwsfc[0:20][0:40][110][72]
>  
> which extracts htsgwsfc over ensemble members 1-21 (0-20 when zero based), time values 0-40 at x=110 and y=72 and gives an ascii text file I can grab using something like wget.
>  
> Am I able to use this kind of notation in GrADS scripts to access a chunk of data that I can define to a variable?
>  
> e.g.
>  
> 'define myvar = http://metserver:9090/dods/neww3/neww3.00z.?htsgwsfc[0:20][0:40][110][72]'
>  
> All combinations I try don't work and I can't find any documentation on it.
>  
> The way to do this is to open the URL, then set the dimension environment in GrADS, then define your variable. 
> Something like this:
>  
> 'sdfopen http://metserver:9090/dods/neww3/neww3.00z'
> 'set e 1 21'
> 'set t 1 41'
> 'set x 110'
> 'set y 72'
> 'myvar=htsgwsfc'
>  
> --Jennifer
>  
> 
> 
>  
> I have looked at the documentation for access using the curly bracket notation, e.g.:
> http://metserver:9090/dods/_expr_{neww3/neww3.t00z}{htsgwsfc}{73:73,111:111,1:1,00Z20MAY2014:00Z25MAY2014}
>  
> ...but I don't seem to be able to capture the ensemble dimension using this format.
>  
> Any help will be greatly appreciated.
>  
> Kieren
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>  
> --
> Jennifer M. Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> 111 Research Hall, Mail Stop 2B3
> George Mason University
> 4400 University Drive
> Fairfax, VA 22030 
> 
>  
> 
> 
>  
>  
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--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 





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