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

Mon Oct 10 07:32:55 PDT 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
LOUISIANA STATE UNIVERSITY 
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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