[ncl-talk] rcm2points and datums

[Dennis Shea]

To my knowledge, all commonly used atmospheric models (eg, WRF,
weather prediction models, climate models) use a spherical earth. I
think this is so common that (again, to my knowledge) all
post-processing software documentation just assumes the 'people know'
that is the situation.

For example , the Earth System Modeling Framework (ESMF) regridding
tools assume a spherical earth,
NCL provides an interface to this software. See:
          http://www.ncl.ucar.edu/Applications/ESMF.shtml

We can put a comment into the rcm2* functions that states this explicitly.

Happy New Year

On Sat, Dec 26, 2015 at 9:04 AM,  <sam.hawkins at vattenfall.com> wrote:
> I have a question about RCM2points and datums.  I often use rcm2points to
> interpolate WRF output latitudes and longitudes.  However, as I now realise,
> WRF uses a spherical datum, whereas I have been supplying wgs1984 latitude
> and longitude as the points to interpolate to.   In this case the results
> could be different by several kilometres in mid-latitudes.  Can anyone
> confirm this is the case? And if so, would it be possible to add  a warning
> to the docs that  you should ensure that you supply all your latitudes and
> longitudes in the same datum.   I think this oversight is very widespread –
> not a fault of NCL.
>
>
>
>
>
> Sam Hawkins
>
> Senior Research Engineer
>
> Vattenfall Wind Power Ltd
>
> sam.hawkins at vattenfall.com
>
> +44 (0)7966 691026
>
>
>
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