[gradsusr] Files for polar stereographic map projection

[Yaqiang Wang]

Only once


On Thu, Jan 2, 2014 at 8:29 PM, Sim D. Aberson <sim.aberson at noaa.gov> wrote:

> On 1/1/14, 5:23 AM, Yaqiang Wang wrote:
> > 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).
>
> That's good information, but doesn't answer my question.  Do I write the
> origin points once or 360 times?
>
> Thanks
>
> >
> >
> > On Wed, Jan 1, 2014 at 4:03 AM, sim.aberson <sim.aberson at noaa.gov
> > <mailto: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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> >
> >
> >
> >
> > --
> > *************************************************
> > Dr. Yaqiang Wang
> > Chinese Academy of Meteorological Sciences (CAMS)
> > 46, Zhong-Guan-Cun South Avenue
> > Beijing, 100081
> > China
> >
> > yaqiang.wang at gmail.com <mailto:yaqiang.wang at gmail.com>
> >
> > http://www.meteothinker.com
> > **************************************************
> >
> >
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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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