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[CF-metadata] What do models assume for the shape of the Earth?

From: John Caron <caron>
Date: Wed, 06 Apr 2005 12:45:30 -0600

Rich Signell wrote:

>
> John,
>
> There are two "sphere" ellipsoids recognized by the EPSG:
>
> Clarke 1866 Authalic Sphere (EPSG_code=7052); radius=6370997
> GRS 1980 Authalic Sphere (EPSG_code=7048); radius=6371007
>
> Both of these spheres were designed to have the volume of the sphere
> match the true ellipsoid, and the slight difference of 10 meters
> represents the progress in understanding the ellipsoid over the 114
> years!
>
> It sounds like you would like to use the older one, and since it
> hasn't been specified, we assume it doesn't matter, but...
>
> I would choose the GRS 1980 value, just to "sound" more modern (so
> that people wouldn't ask me why my netcdf data was based on something
> that came from 1866)

thanks very much, i will use 6371007 meters.
Received on Wed Apr 06 2005 - 12:45:30 BST

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