[ncl-talk] Mapping issue on Polar Stereographic projection over Antarctica

[Deniz Bozkurt]

Hi Bill,

Excellent! Thanks a lot for this helpful information.

Cheers,
Deniz

--
Deniz Bozkurt, PhD
Postdoctoral Researcher
Center for Climate and Resilience Research (CR2) <www.cr2.cl <http://www.cr2.cl/>>
Department of Geophysics, University of Chile
Blanco Encalada 2002, Santiago, Chile

Mobil: +56 (9) 56107310
https://sites.google.com/site/deniboz <https://sites.google.com/site/deniboz>


> On Dec 10, 2018, at 5:33 PM, Bill Ladwig <ladwig at ucar.edu> wrote:
> 
> Hi Deniz,
> 
> Try changing your mpCenterLat parameter to -90.0. Since you're doing Polar Stereographic (and not the more general Stereographic that NCL uses), you don't want the projection center latitude to be your grid center latitude. The projection center latitude needs to be a pole (90.0 for Northern, -90.0 for Southern).
> 
> Hope this helps,
> 
> Bill
> 
> 
> On Mon, Dec 10, 2018 at 1:04 PM Deniz Bozkurt <bozkurtd at itu.edu.tr <mailto:bozkurtd at itu.edu.tr>> wrote:
> Dear NCL,
> 
> I am struggling with a correct representation of WRF output over the Antarctic Peninsula. I believe that the issue is related with Polar Stereographic projection of WRF configuration:
> 
> CEN_LAT : -61.98499
> CEN_LON : -72.011
> TRUELAT1 : -61.985
> TRUELAT2 : -90
> MOAD_CEN_LAT : -61.985
> STAND_LON : -72.011
> POLE_LAT : 90
> POLE_LON :  0
> GMT :  0
> MAP_PROJ : 2
> MAP_PROJ_CHAR : Polar Stereographic
> 
> Note that I am using a post-processed WRF file produced by “wrfout_to_cf.ncl” (http://foehn.colorado.edu/wrfout_to_cf/overview.html <http://foehn.colorado.edu/wrfout_to_cf/overview.html>). Although I have defined the projection information in the script, I am still having a slight shift of contour fields in the map plot. I attach my script and a comparison of NCL vs. ncview to illustrate the shifting. I have tried to put my data "wrfout_d02_2010-01-01_06-post.nc <http://wrfout_d02_2010-01-01_06-post.nc/>” to the ncl ftp server but not sure if it worked, therefore, a dropbox link of the data is also provided here: 
> 
> https://www.dropbox.com/s/erajyyon7mum0zn/wrfout_d02_2010-01-01_06-post.nc?dl=0 <https://www.dropbox.com/s/erajyyon7mum0zn/wrfout_d02_2010-01-01_06-post.nc?dl=0>
> 
> I would be grateful if someone could help me address the problem.
> 
> Thanks in advance,
> Deniz
> 
> --
> Deniz Bozkurt, PhD
> Postdoctoral Researcher
> Center for Climate and Resilience Research (CR2) <www.cr2.cl <http://www.cr2.cl/>>
> Department of Geophysics, University of Chile
> Blanco Encalada 2002, Santiago, Chile
> 
> Mobil: +56 (9) 56107310
> https://sites.google.com/site/deniboz <https://sites.google.com/site/deniboz>
> 
> 
> 
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