[thredds] using the netcdf subsetting service

[Roy Mendelssohn]

Hi Eric:

It is unclear if what you are asking is that you only want the TDS to  
display a subset of the data to the user, or if you want to know how  
a user can subset the data that is being served by the TDS.  If the  
latter, what applications do you use or do you just want to use the  
hrml page.

Either way, is the TDS publicly accessible?

Thanks,

-Roy M.

On Jan 7, 2008, at 4:04 PM, Eric Davies wrote:

> I've got the Thredds Data Server installed and I'm trying to use it  
> to subset a 3D grid (depth, latitude, longitude) large netcdf file.  
> The netcdf file was generated by a third parties software, and is  
> probably not compliant with anything. As subset of its schema is  
> shown below.
>
> If I rename some coordinate variables, I should be able to make it  
> compliant with some convention. My question is how do I most  
> efficiently extract a 3D subset? I want to extract a subset of  
> depth as well as a subset of longitude and latitude.
>
> Any ideas would be most appreciated.
> Thank you.
> Eric.
>
> netcdf d7110.subvol {
> dimensions:
>         TIMESTEP = 1 ;
>         LONGITUDE_T = 481 ;
>         LATITUDE_T = 241 ;
>         LONGITUDE_U = 481 ;
>         LATITUDE_U = 241 ;
>         DEPTH = 66 ;
>         DEPTH_EDGES = 67 ;
> variables:
>         int TIMESTEP(TIMESTEP) ;
>                 TIMESTEP:long_name = "Timestep" ;
>         float LONGITUDE_T(LONGITUDE_T) ;
>                 LONGITUDE_T:long_name = "Longitude" ;
>                 LONGITUDE_T:units = "degrees" ;
>                 LONGITUDE_T:Format = "F10.4" ;
>         float LATITUDE_T(LATITUDE_T) ;
>                 LATITUDE_T:long_name = "Latitude" ;
>                 LATITUDE_T:units = "degrees" ;
>                 LATITUDE_T:Format = "F10.4" ;
>         float DEPTH(DEPTH) ;
>                 DEPTH:long_name = "Depth" ;
>                 DEPTH:units = "cm" ;
>                 DEPTH:Format = "F5.2" ;
>                 DEPTH:positive = "down" ;
>                 DEPTH:edges = "DEPTH_EDGES" ;
>         float POTENTIAL_TEMPERATURE__MEAN_(DEPTH, LATITUDE_T,  
> LONGITUDE_T) ;
>                 POTENTIAL_TEMPERATURE__MEAN_:long_name = "potential  
> temperature
> (mean)" ;
>                 POTENTIAL_TEMPERATURE__MEAN_:units = "C" ;
>                 POTENTIAL_TEMPERATURE__MEAN_:_FillValue = 0.f ;
>                 POTENTIAL_TEMPERATURE__MEAN_:LEVEL = 0 ;
>                 POTENTIAL_TEMPERATURE__MEAN_:T_GRID = -1 ;
>  ....
> }
>
> **********************************************
> Eric Davies, M.Sc.
> Barrodale Computing Services Ltd.
> Tel: (250) 472-4372 Fax: (250) 472-4373
> Web: http://www.barrodale.com
> Email: eric at barrodale.com
> **********************************************
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> Victoria BC Canada V8W 3W2
>
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**********************
"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."