Re: Problems with Stereographic projection plots

Hi Dennis

I had done already and it did not work (I get a white band on the right
side of the plot). A colleague figured out how to fix the problem. The
projection parameters are wrongly specified in the WRF file. For a
polar stereographic projection the center latitude should be 90., that is:

res_at_mpCenterLatF = 90.

and not what is specified with

res_at_mpCenterLatF = ff_at_TRUELAT1

Perhaps the next version of "WRFUserARW.ncl" will contain the fix.

Thanks,
Andrea

Dennis Shea wrote:
> I think the following will work:
>
> landmask_at_lat2d = xlat
> landmask_at_lon2d = xlon
>
> map = gsn_csm_contour_map(wks,landmask,res)
>
> 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
>>
>>
>>
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>>
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-- 
----------------------------------------------------------------
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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