Re: Problems with Stereographic projection plots

If you are using the wrf_xxxx scripts to do the plotting, then a fix
was issued in which the wrong value was being used for the center
latitude for the stereographic projection case. It was changed from
TRUELAT1 to CEN_LAT (both attributes of the variable on the WRF file).

This fix should make it into the next release of NCL, hopefully
the end of this month.

If you have V4.3.1, you can easily make the change yourself. You may
need "root" permissions to do this:

   1. Edit the file $NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl

   2. Change the line:
       opts_at_mpCenterLatF = get_res_value_keep(opts, "mpCenterLatF", in_file_at_TRUELAT1)

to:
       opts_at_mpCenterLatF = get_res_value_keep(opts, "mpCenterLatF", in_file_at_CEN_LAT)

--Mary

On Fri, 12 Oct 2007, Andrea Hahmann wrote:

> Hi!
>
> I have been having problems trying to plot a land mask (or land use)
> field on a stereographic projection. The data comes from a WRF "geo"
> file. When I use res_at_tfDoNDCOverlay = True, then the coastline of the
> data does not match the drawn geographic coastline. When I turn it off,
> the coastlines line up but I get a strange white band on the right side
> of the plot (also a small one on the bottom). I have experimented with
> various parameters to set the projection (CEN_LAT, CEN_LON, and
> STAND_LON), but nothing seems to help.
>
> Any other ideas of what might be going wrong?
>
> The data is on an ftp site
> (ftp://ftp.rap.ucar.edu/pub/hahmann/geo_em.d01.nc) if anybody is
> interested in trying the script. The script and plot are attached.
>
> Thank you so much!
> Andrea
>
> --
> ----------------------------------------------------------------
> Andrea N. Hahmann, Ph.D.
> Research Applications Laboratory
> Natl. Center for Atmospheric Research Phone: 1-303-497-8383
> PO BOX 3000 Fax: 1-303-497-8401
> Boulder, CO 80301 hahmann_at_ucar.edu
> ----------------------------------------------------------------
>
>
>
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Received on Tue Oct 16 2007 - 09:17:50 MDT