[Proj] Projection Dev - How to call other projections from a projection?
Michael P Finn
mfinn at usgs.gov
Mon Oct 10 13:24:32 EST 2011
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.
_______________________________________________
Proj mailing list
Proj at lists.maptools.org
http://lists.maptools.org/mailman/listinfo/proj
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maptools.org/pipermail/proj/attachments/20111010/48970292/attachment.htm
More information about the Proj
mailing list