Re: [ferret_users] matrix format

[Jaison Kurian <jaison@xxxxxxxxxxxxxxxxxx>]

Hi,
     Assuming that matrix format means data written along lon (columns)
and lat (rows/lines). Here is a simple example. Please let me know if you
have any questions.....

Best Regards,

Jaison

!------------example starts here--------------------
      set data 501.nc
      set reg/x=60:100/y=-5:25/l=1/k=1   ! 161 points along x/lon
                                         ! 121 points along y/lat
      sp rm -f text.dat ! remove previous versions
      list/file=text.dat/format=(161F11.5)/nohead/append u10[d=1]

      ! check the ascii file

      define axis/x=60:100:0.25/units=longitudes xlon  ! 161 columns
      define axis/y=-5:25:0.25/units=latitudes   ylat  ! 121 rows/lines
      define grid/x=xlon/y=ylat gfile

      ! now we have to read along the lines...so use /COLUMNS=161
      ! with the file command, 161-number of columns...

      FILE/grid=gfile/var=uu/columns=161 text.dat

      ! the difference between u10 and uu should be ideally zero
      ! but you may see very very small values due to precision issues
      ! of data loaded from ascii file

      shade/lev=(-.2,.2,0.01) uu[d=2]-u10[d=1]
      go land
!------------example ends   here--------------------

On Tue, 01 Jan 2008 21:25:28 +0530, M.V.Ramana Murthy wrote
> Dear Members,
> we want to read netcdf file containing wind (U10 and V10) and write 
> to matrix format. we could read and write the file but we see some 
> errors in writing. The original data is at 0.25 deg grid with an 
> extent ( long 29.9E to 120.1E and Lat 60.1S to 30.1 N) and we would 
> like to get matrix format for the region ( long 60Eto 90Eand Lat -6 
> to 26 N) at 0.25 deg. The output file gives long at 2.75 deg and Lat 
> at 0.25 deg . The commands and the input file  we used is enclosed herewith
> 
> set data 501.nc
> list/x=60:100/y=-5:25/file=test.dat U10
> 
> Could you suggest how to get the data at 0.25 deg for both long and 
> lat .
> 
> Thanks in advance.
> 
> N.T.Reddy
> 
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