[ncl-talk] changing the dimension

[Dennis Shea]

The contour plot routines expect (y_axis,x_axis) order

  print(RF_fnl&nlev)    ; look ... does this have a long_name or units
attribute?


  work = RF_fnl(nlev|:,nscan|:,npix|:)  ; convenience for illustration
  printVarSummary(work)                    ;    [nlev | 80] x   [nscan |
9247] x [npix | 49]

  np       = ??   ; your choice
  work2 = work(:,:,np)
  printVarSummary(work2)                   ;  [nlev | 80] x   [nscan |
9247]

  res at tmYLFormat = "f"                       ; No unnecessary zeroes
  res at tiYAxisString = "level (km)"        ; if not specified, long_name
will be used
  plot = gsn_csm_contour(wks,work2, res)

You will still get index values along the x-axis (longitude axis)

---
You can plot the lat/lon at a specified 'npix' index usinig lat2d/lon2d

See: http://www.ncl.ucar.edu/Applications/narr.shtml
Example 6

It is not for satellite data but the principle is the same.


===
This is *not* a 'pure' zonal plot. Fot that you must interpolate to a user
specified grid.
Use ESMF regridding.

Good luck




On Fri, Jun 17, 2016 at 5:40 AM, Geeta Geeta <geetag54 at yahoo.com> wrote:

> I have swath data and I am extracting the rain rate from it This is 3
> dimensional.
>
> Variable: RF_fnl
> Type: double
> Total Size: 289985920 bytes
>             36248240 values
> Number of Dimensions: 3
> Dimensions and sizes:   [nscan | 9247] x [npix | 49] x [nlev | 80]
> Coordinates:
>             nlev: [20..0.25]
> Number Of Attributes: 3
>   lat2d :       <ARRAY of 453103 elements>
>   lon2d :       <ARRAY of 453103 elements>
>   _FillValue :  -9999
>
> The 3rd dim  has 80 levels that corresponds to data from 20km to 0.25km at
> 250m resolution.
>
> In the vertical cross section (Ht vs Longitude Plot) plot for the region
> of interest (attatched).
> My problem s how do I convert these nlevels from 0-79 as shown in the X
> axis to 0.25 to 20 km.
>
> also how to change 0-120 on the Y axis to the longitude values
>
>    -
>
>
> Geeta.
>
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