[gradsusr] how to reveres latitudes in nc file

[Andrew Friedman]

Another option is to use the NCO tool ncpdq:
 http://nco.sourceforge.net/nco.html#ncpdq-netCDF-Permute-Dimensions-Quickly

Andrew

On Mar 26, 2013, at 12:32 PM, Lee Byerle <lbyerle at yahoo.com> wrote:

> Kishore,
>  
> Below may also be helpful.  It is sample fortran code that can reverse the latitude indices, and writes back to binary (assuming .nc is first dumped to binary):
> .
> .
> .
> irec1=1
> irec2=1
>  
> do nvar=1,5   !Variables in binary file, with u-wind
> if(nvar.eq.1) then    
>   do k=1,nk
>     read(1,rec=irec1)vgrads  !read data in .nc file
>     do i=1,ni
>        do j=1,nj
>            u(i,j,k)=vgrads(i,nj+1-j)               !reverse j-index
>          enddo
>       enddo
>       irec1=irec1 + 1
>      enddo
>  
> c now write to file w/latitude (j-index) reversed:
>  
> do k=1,nk
>  do i=1,ni
>    do j=1,nj
>      var(i,j) = u(i,j,k)
>     enddo
>    enddo
>    write(17,rec=irec2)var
>    irec2=irec2 + 1
> enddo
> .
> .
> etc.
>  
> The new binary output, with latitude starting at +90, can be viewed with a .ctl file using options yrev.
>  
> Lee
> From: Charles Seman - NOAA Federal <charles.seman at noaa.gov>
> To: GrADS Users Forum <gradsusr at gradsusr.org> 
> Sent: Tuesday, March 26, 2013 1:09 PM
> Subject: Re: [gradsusr] how to reveres latitudes in nc file
> 
> Kishore,
> 
> Have you tried the "yrev" option? 
> http://grads.iges.org/grads/gadoc/descriptorfile.html#OPTIONS
> 
> You would make a GrADS data descriptor file to open the .nc file, and 
> include in the data descriptor file the line:
> options yrev
> 
> Hope this helps,
> Chuck
> 
> On 03/26/2013 01:40 AM, Kishore Babu wrote:
> > Dear grads users,
> >
> > My nc file has latitudes as below
> >
> > latitude = -90, -87.5, -85, -82.5, -80, -77.5, -75, -72.5, -70, -67.5, -65,
> >      -62.5, -60, -57.5, -55, -52.5, -50, -47.5, -45, -42.5, -40, -37.5,
> > -35,
> >      -32.5, -30, -27.5, -25, -22.5, -20, -17.5, -15, -12.5, -10, -7.5, -5,
> >      -2.5, 0, 2.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30,
> > 32.5,
> >      35, 37.5, 40, 42.5, 45, 47.5, 50, 52.5, 55, 57.5, 60, 62.5, 65,
> > 67.5, 70,
> >      72.5, 75, 77.5, 80, 82.5, 85, 87.5, 90 ;
> >
> > But, I need to have latitudes in reveres such as below...
> >
> > latitude = 90, 87.5, 85, 82.5, 80, 77.5, 75, 72.5, 70, 67.5, 65, 62.5, 60,
> >      57.5, 55, 52.5, 50, 47.5, 45, 42.5, 40, 37.5, 35, 32.5, 30, 27.5, 25,
> >      22.5, 20, 17.5, 15, 12.5, 10, 7.5, 5, 2.5, 0, -2.5, -5, -7.5, -10,
> > -12.5,
> >      -15, -17.5, -20, -22.5, -25, -27.5, -30, -32.5, -35, -37.5, -40,
> > -42.5,
> >      -45, -47.5, -50, -52.5, -55, -57.5, -60, -62.5, -65, -67.5, -70,
> > -72.5,
> >      -75, -77.5, -80, -82.5, -85, -87.5, -90 ;
> >
> > Could you please anybody let me know how it is changed?
> >
> > Thank you in advance..
> >
> > Regards,
> >
> > Kishore
> >
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> 
> -- 
> 
> Please note that Charles.Seman at noaa.gov should be considered my NOAA
> email address, not cjs at gfdl.noaa.gov.
> 
> ********************************************************************
>   Charles Seman                                Charles.Seman at noaa.gov
>   U.S. Department of Commerce / NOAA / OAR
>   Geophysical Fluid Dynamics Laboratory        voice: (609) 452-6547
>   201 Forrestal Road                              fax: (609) 987-5063
>   Princeton, NJ  08540-6649            http://www.gfdl.noaa.gov/~cjs/
> ********************************************************************
> 
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> official or unofficial position of the United States Federal Government,
> the United States Department of Commerce, or NOAA."
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Andrew Friedman
Graduate Student, UC Berkeley Geography
andfried at berkeley.edu