Re: Offset terrain in WRF Polar Stereographic

Don,

I converted your wrf_xxxx to use gsn_xxxx functions, so that I could
use the XLAT and XLONG values on the file to do the transformation,
instead of depending on the map projection to be exactly right.

I did use the same map parameters that I believe wrf_xxxx is trying
to use.

As you can see, the contours now fall within the borders much better,
but it also looks like the rotation is skewed a little. I think maybe
either the wrf_map_overlays function isn't doing the right thing, or
else the map parameters on your file are not correct. My guess is
that mpCenterLonF or mpCenterLatF may be incorrect, or one of the
Corners resources is incorrect.

Perhaps wrfhelp has some information here...

--Mary


On Feb 16, 2010, at 12:04 PM, Don Morton wrote:

> Hi,
>
> I thought this problem had been resolved ages ago, but maybe only
> for Lambert projections.
>
> I'm using NCL 5.1.1 on WRF v3.1.1 netCDF output with polar
> stereographic projection, and I'm running into the same old terrain-
> offset issues that some of us have mentioned over the past several
> years.
>
> Am I correct in my expectations that the WRF NCL mapping routines
> "should" handle this these days? Or, am I possibly missing
> something key? I can go back and handle this the old way, using
> the standard NCL plotting functions I once used, with the following
> sorts of resource settings
>
> res@gsnAddCyclic = False ; Regional data, not
> cyclic
> res@tfDoNDCOverlay = False ; Set True for
> native projection
>
> ; Specify map boundaries
> res@mpLimitMode = "Corners" ; Use the corners
> limit mode
>
>
> and not using all those convenient WRF functions, but now I'm
> wondering...
>
>
> My resulting image is at
>
> <http://weather.arsc.edu/Miscellaneous/NCLWoes/Hgt.png>
>
> With a simplified script available at
>
> <http://weather.arsc.edu/Miscellaneous/NCLWoes/Hgt.ncl>
>
> and the wrfout file (870 Mbytes) available at
>
> <http://weather.arsc.edu/Miscellaneous/NCLWoes/
> wrfout_d01_2009-12-20_00:00:00>
>
>
> --
> Arctic Region Supercomputing Center
> http://www.arsc.edu/~morton/
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Received on Tue Feb 16 16:37:09 2010