[thredds] using the netcdf subsetting service

[Eric Davies]

Hi Roy,

I'm written a C application using the OCAPI. The application produces 
the url, sends it to the server, and accepts binary results.

I want the server to do the subsetitng, and pass the subsetted 
results to my application. Presumably this
would be more efficient than asking the application to do it.

The server is stuck behind our firewall I'm afraid. Presumably there 
is some configuration magic I still need to do to get ncss to work, 
if there is a way for me to use ncss effectively.

Eric.
At 04:12 PM 1/7/2008, Roy Mendelssohn wrote:
>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
>>**********************************************
>>Mailing Address:
>>P.O. Box 3075 STN CSC
>>Victoria BC Canada V8W 3W2
>>
>>Shipping Address:
>>Hut R, McKenzie Avenue
>>University of Victoria
>>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."
>

**********************************************
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
**********************************************
Mailing Address:
P.O. Box 3075 STN CSC
Victoria BC Canada V8W 3W2

Shipping Address:
Hut R, McKenzie Avenue
University of Victoria
Victoria BC Canada V8W 3W2
**********************************************


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