Re: WRF Cylindrical Equidistant Projection NCL

Hi Warren,

There are two possible issues here:

1. You can only use wrf_user_ll_to_ij on WRF-ARW files. This function
expects the file to have certain file attributes, like MAP_PROJ, in order
to determine the correct map projection.

2. You need to remember to subtract 1 from the results, because this
function returns in the indexes in "Fortran" style, starting the index
count at 1, whereas in NCL, indexes start at 0.

Please see the documentation at:

http://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_ll_to_ij.shtml

to make sure you are using this function correctly.

--Mary



On Wed, Jul 2, 2014 at 9:02 AM, Pettee, Warren <wpettee@uncc.edu> wrote:

> Hi,
>
>
> I am trying to build meteograms using WRF output that is in the
> Cylindrical Equidistant Projection. The function wrf_user_ll_to_ij will
> generate invalid grid points when I follow the WRF-ARW example code here:
> http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/SPECIAL/wrf_meteo_5.ncl
>
>
> If I set the locX and locY variables to a known location, I recieve a
> dimension error. Is NCL incompatible with this projection?
>
>
> Thanks,
>
>
>
>
> *Warren Pettee Undergraduate - Meteorology *Department of Geography and
> Earth Sciences
> University of North Carolina at Charlotte
> 9201 University City Blvd, Charlotte, NC 28223
> wpettee@uncc.edu
>
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Received on Mon Jul 07 03:29:05 2014