Re: Plotting non-standard projections from GRIB output

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Wed, 20 Jun 2007 10:03:22 -0600 (MDT)

All,

Don and I are working on this offline, but it turns out his data file
is very similar to the one that is used in example 3 at:

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

We are working on trying to get the projection oriented properly.

--Mary

On Tue, 19 Jun 2007, Don Morton wrote:

> Hi,
>
> Several weeks ago you all pulled miracles and helped me
> plot my WRF netCDF output on non-standard projections,
> essentially by having me make my lat and lon variables
> attributes of the field I wanted to plot, and getting rid
> of the assumption that these were native projections.
> The underlying problem, I believe, was that the center
> lon and the standard lon are not the same in these
> projections.
>
> Now I'm trying to apply the same logic to GRIB output
> (the GRIB output was derived from the WRF netCDF
> files using WRF-Post), but this same logic (which seems
> reasonable to me) isn't working. As before with the
> netCDF files, the Alaska Range is winding up in the
> wrong place, etc.
>
> I would be inclined to question the validity of the GRIB
> output files, but the Fairbanks NWS office has been
> ingesting them for AWIPS successfully for over a year
> now (and, I have an email into their guy to see if he might
> have any hints).
>
> I'm attaching the script that I've been trying to make work
> (almost exactly the same as my script for netCDF files,
> with the exception of different variable names).
>
> Sample GRIB files are available at:
>
> http://weather.arsc.edu/ForecastProducts/NorthAlaska6/grib/2007061912/
>
> and the corresponding netCDF files (the "native" WRF output which was
> used to generate the GRIB files) are available at:
>
> http://weather.arsc.edu/ForecastProducts/NorthAlaska6/wrfout/2007061912/
>
> I did try ncl_convert2nc just for the heck of it, but that produced
> disastrous results :)
>
> I should note that IDV tends to produce the same sort of graphic as
> this NCL script does (but it also does so with the netCDF file), with
> the terrain in the wrong place.
>
> I realize this may be a complex problem, and that "maybe" the solution
> is for me to just give up on this stupid projection I've been using, but
> I might as well ask.
>
> Thanks,
>
> Don Morton
>
> --
> Arctic Region Supercomputing Center
> http://weather.arsc.edu/
>
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Received on Wed Jun 20 2007 - 10:03:22 MDT

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