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Re: GDS Datasets in Ferret



Hi Jennifer,
To answer the first question, at present there is a string variable
in Ferret for the dataset names - that's 255 characters long.  Your
first file is over 270 characters long, the second just under 255.
This is something we will increase in the next release of Ferret.
As more of these kinds of datasets are used, I'm sure there will
be the need for longer names.

Ansley Manke

"Jennifer M. Adams" wrote:

> Dear Ferret Experts,
>
> I am testing some GDS server-side analysis requests that are
> really long ... so long that I think they may exceed the
> maximum allowable length in Ferret. I am using v5.51 for OSF
> 4.0.
>
> The following doesn't work (my email program will wrap the
> lines, but this should all be one long stringy URL):
>
> yes? use
> "http://dataportal.ucar.edu:9191/dods/_expr_{C20C/C20C_A,C20C/C20C_B,C20C/C20C_C,C20C/C20C_D,C20C/C20C_E,C20C/C20C_F,C20C/C20C_G,C20C/C20C_H}{ave((slp.1+slp.2+slp.3+slp.4+slp.5+slp.6+slp.7+slp.8)/8.0,t+0,t=601,12)}{0:358.125,-30:30,1000:1000,00z01jan1949:00z01dec1949}"
>
> But this does:
>
> yes? use
> "http://dataportal.ucar.edu:9191/dods/_expr_{C20C/C20C_A,C20C/C20C_B,C20C/C20C_C,C20C/C20C_D,C20C/C20C_E,C20C/C20C_F,C20C/C20C_G}{ave((slp.1+slp.2+slp.3+slp.4+slp.5+slp.6+slp.7)/7.0,t+0,t=601,12)}{0:358.125,-30:30,1000:1000,00z01jan1949:00z01dec1949}"
>
> Second Question:
>
> Once I do successfully open a GDS server-side analysis
> request, there is a shorthand name for the data set that is
> something like "_exprcache_104992113430013". The shorthand
> name is useful if you want to include the results of your
> first server-side analysis request in yet another
> server-side analysis request. This shorthand name is
> included in the output of 'query file' (a GrADS command
> similar to "show data"), but I don't know how to retrieve it
> with Ferret. "show data" gives me this (once again, sorry
> about the unsightly line wrapping):
>
>      currently SET data sets:
>     1>
>
> http://dataportal.ucar.edu:9191/dods/_expr_{C20C/C20C_A,C20C/C20C_B,C20C/C20C_C,C20C/C20C_D,C20C/C20C_E,C20C/C20C_F,C20C/C20C_G}{ave((slp.1+slp.2+slp.3+slp.4+slp.5+slp.6+slp.7)/7.0,t+0,t=601,12)}{0:358.125,-30:30,1000:1000,00z01jan1949:00z01dec1949}
> (default)
>  name    title                 I      J     K    L
>  RESULT  result of expression  1:192  1:34  ...  1:12
>
>
> I'm not exactly sure how GrADS knows the shorthand name, but
> I'm assuming it's part of the metadata that comes back from
> the GDS. Is there any way to recover the shorthand name with
> Ferret?
>
> Thanks,
> Jennifer
> --
> ----------------------------------------
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705-3106
> Phone: (301)902-1278 or (301)595-7000
> Fax:   (301)595-9793
> Email: jma@cola.iges.org

--
Ansley Manke  Pacific Marine Environmental Laboratory  Seattle WA  (206)526-6246





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