[Proj] Projection Dev - How to call other projections fromaprojection?

Clifford J Mugnier cjmce at lsu.edu
Mon Oct 10 09:32:55 EST 2011

A spheroid is an ellipsoid associated with a classical datum that ALSO has a geoid model such as:  NAD27, Clarke 1866 spheroid; European Datum 1950, International spheroid.  Conversely, the Camacupa Datum of Angola has the Clarke 1866 ellipsoid, etc.
Most people ignore the distinction, though.  (I suspect through ignorance.)
Clifford J. Mugnier, C.P., C.M.S.
Chief of Geodesy,
Center for GeoInformatics
Department of Civil Engineering 
Patrick F. Taylor Hall 3531
Baton Rouge, LA  70803
Voice and Facsimile:  (225) 578-8536 [Academic] 
Voice and Facsimile:  (225) 578-4578 [Research] 
Cell: (225) 328-8975 [Academic & Research]
Honorary Life Member of the 
Louisiana Society of Professional Surveyors 
Fellow Emeritus of the ASPRS 
Member of the Americas Petroleum Survey Group


From: proj-bounces at lists.maptools.org on behalf of Charles Karney
Sent: Mon 10-Oct-11 08:32
To: proj at lists.maptools.org
Subject: Re: [Proj] Projection Dev - How to call other projections fromaprojection?

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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