[gradsusr] Files for polar stereographic map projection

[Yaqiang Wang]

You should write the data following polar stereographic projection
coordinate but not LongLat coordinate. Then a PDEF line should be added in
the control file (http://www.iges.org/grads/gadoc/pdef.html).


On Wed, Jan 1, 2014 at 4:03 AM, sim.aberson <sim.aberson at noaa.gov> wrote:

> I have written fortran code to output fields on a south polar
> stereographic grid.  When I plot, the values seem to drift from their
> correct location as I get further into my file, so I am doing something
> wrong.  My control file has:
>
>    XDEF    360   LINEAR  -180.000     1.000000
>    YDEF    300   LINEAR   -90.000     0.009009
>
> When I write the file, do I write the 360 points at -90 latitude (even
> though they are all the same value), or is GrADS just expecting one
> value there, followed by the 360 points for the next latitude.  I am
> doing the former, but if GrADS is expecting the latter, that could
> account for the drift.
>
> I could not find this information in the online documentation.
>
> Thanks
>
> --
> Sim Aberson         AOML/Hurricane Research Division          Miami, FL
>      "Hurricane states erect statues in my honor." -- David Sedaris
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>



-- 
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Dr. Yaqiang Wang
Chinese Academy of Meteorological Sciences (CAMS)
46, Zhong-Guan-Cun South Avenue
Beijing, 100081
China

yaqiang.wang at gmail.com

http://www.meteothinker.com
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