Re: splitting netcdf file into multiple files by date

• To: Selina Satterfield <satterfields2000@xxxxxxxxx>
• Subject: Re: splitting netcdf file into multiple files by date
• From: t.hume@xxxxxxxxxx
• Date: Tue, 12 Apr 2005 10:26:47 +1000

Hi,

This is nasty, but it would be quick. Your C++ program could make a call
to the ncks utility (which is part of the NetCDF operators). In C you
use the system function ... I guess it is similar or the same in C++.
Compared to using the C++ interface, this will save you many many lines
of code, at the expense of being a very inelegant solution.

Tim Hume


On Mon, 11 Apr 2005 11:42:20 -0700 (PDT)
Selina Satterfield <satterfields2000@xxxxxxxxx> wrote:

> I'm new to netCDF development and currently I have a
> large number of netcdf files
> that contain multiple dimensions, variables , and data
> for a period of time.  Here is a cdl that I generated
> with ncdump of one of the files
> 
> netcdf test {
> dimensions:
>       lat = 141 ;
>       lon = 360 ;
>       time = UNLIMITED ; // (31 currently)
> variables:
>       float lat(lat) ;
>               lat:long_name = "Latitude" ;
>               lat:units = "degrees_north" ;
>       float lon(lon) ;
>               lon:long_name = "Longitude" ;
>               lon:units = "degrees_east" ;
>       float time(time) ;
>               time:long_name = "Time" ;
>               time:units = "hours since 1997-01-01" ;
>       float age_rcnt_obs(time, lat, lon) ;
>               age_rcnt_obs:_FillValue = 999.f ;
>               age_rcnt_obs:long_name = "Age of Recent Observation"
> ;
>               age_rcnt_obs:missing_value = 999.f ;
>               age_rcnt_obs:units = "Hours" ;
>               age_rcnt_obs:valid_max = 255.f ;
>               age_rcnt_obs:valid_min = 0.f ;
>       float anal_temp(time, lat, lon) ;
>               anal_temp:_FillValue = 9999.f ;
>               anal_temp:long_name = "Analysis Temperature" ;
>               anal_temp:missing_value = 999.9f ;
>               anal_temp:scale_factor = 0.1f ;
>               anal_temp:units = "Deg. C" ;
>               anal_temp:valid_max = 70.f ;
>               anal_temp:valid_min = -10.f ;
>       float avgrad(time, lat, lon) ;
>               etc.....;
> 
> // global attributes:
>               :title = "SST 100 KM FIELD" ;
> data:
> 
>  lat = -70, -69, -68, -67, -66, -65, -64, -63, -62,
> -61, -60, -59, -58, -57, 
>     -56, -55, -54, -53, -52, -51, -50, -49, -48, -47,
> -46, -45, -44, -43, 
>     etc..............;
> 
>  lon = -180, -179, -178, -177, -176, -175, -174, -173,
> -172, -171, -170, 
>     -169, -168, -167, -166, -165, -164, -163, -162,
> -161, -160, -159, -158, 
>     -157, -156, -155, -154, -153, -152, -151, -150,
> -149, -148, -147, -146, 
>     -145, -144, -143, -142, -141, -140, -139, -138,
> -137, -136, -135, -134, 
>     etc..............;
> 
>  time = 60600, 60624, 60648, 60672, 60696, 60720,
> 60744, 60768, 60792, 60816, 
>     60840, 60864, 60888, 60912, 60936, 60960, 60984,
> 61008, 61032, 61056, 
>     61080, 61104, 61128, 61152, 61176, 61200, 61224,
> 61248, 61272, 61296, 
>     61320 ;
> 
>  age_rcnt_obs
>   .........etc
> 
> As you can see with the time there is data for 31
> days. What I would like to do is create 31 separate
> files using the NetCDF C++ Interface. Each file would
> include all dimensions variables attributes and only
> the data for that single day. I can't use a utility I
> need to create this myself since dates and other
> information needs to be obtained from a database. My
> question is can anyone send a code example of how I
> might do this? Thank you for your time and
> consideration.
> 
> Selina
> 
> 
> 
> 
>               
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• References:
  • splitting netcdf file into multiple files by date
    • From: Selina Satterfield