[ncl-talk] How to plot TRMM orbital data

[Mary Haley]

Hi Laura,

Is there something unique about the TRMM high-res orbital data that would
prevent you from using the standard TRMM examples?

I'm not familiar with TRMM data, but I see from the "hdf4sds_1.ncl" example:

       http://www.ncl.ucar.edu/Applications/HDF.shtml

that there were a few of things that had to be done before the data could
be plotted:


   - The array was reordered to be scan x latitude x longitude, because it
   originally comes in as scan x longitude x latitude:

   prc    = work(scan|:,latitude|:,longitude|:)


   - Some metadata was attached (to make better titles on the plots)

   - Lat/lon arrays were created from scratch and attached to "prc".

   I'm not sure why this was done, because I would think the lat/lon
arrays would be provided on the file, but the script keeps referring
to a README section that I haven't looked at)

You then simply call gsn_csm_contour_map to plot "prc" over a map.
Note that "res at cnFillMode" is being set to "RasterFill". This is
*very* important for large datasets.  The default "AreaFill"
(smoothed) contouring in NCL is too slow for large data.

If you still have problems, then can you point us to a data file that
we can download? Also, it would help to know what kind of plot you
need to create.

--Mary


On Tue, Feb 16, 2016 at 8:51 PM, Laura Fowler <laura at ucar.edu> wrote:

> Hi ncl users:
>
> I browsed through the examples that show how to plot TRMM data, but I
> did not find an example on how to plot high-resolution orbital data.
> Is there an example that I can used to plot 2B31 TRMM data?
>
> Thanks,
> Laura
>
>
> --
>
> !-------------------------------------------------------------------------------------------------------------
> Laura D. Fowler
> Mesoscale and Microscale Meteorology Division (MMM)
> National Center for Atmospheric Research
> P.O. Box 3000, Boulder CO 80307-3000
>
> e-mail: laura at ucar.edu
> phone: 303-497-1628
>
>
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