[Proj] Projection Dev - How to call other projections from a projection?

[Michael P Finn]

Interesting.

So where is a threshold (that turns a spheroid into an ellipsoid)? 
Technically all spheroids are ellipsoids, mathematically. (Further, a 
sphere is also an ellipsoid whose semi-major and semi-minor axes are 
identical.)





From:
Charles Karney <charles.karney at sri.com>
To:
<proj at lists.maptools.org>
Date:
10/10/2011 07:34 AM
Subject:
Re: [Proj] Projection Dev - How to call other projections from 
aprojection?
Sent by:
proj-bounces at lists.maptools.org



This may be true is cartography.  It's only partly true in geodesy --
some authors make a distinction, e.g.,

   W. A. Heiskanen and H. Moritz, Physical Geodesy,
   (Freeman, San Fransisco, 1967)

use spheroid to refer to an approximately spherical shape.  (This was,
presumably, its original meaning.)


On 10/09/11 19:43, Noel Zinn (cc) wrote:
> "Spheroid" and "ellipsoid" are synonyms for the same thing in geodesy 
and
> cartography.
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