<br><font size=2 face="sans-serif">Interesting.</font>
<br>
<br><font size=2 face="sans-serif">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.)</font>
<br>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Charles Karney <charles.karney@sri.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif"><proj@lists.maptools.org></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">10/10/2011 07:34 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [Proj] Projection Dev - How to call
other projections from aprojection?</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">proj-bounces@lists.maptools.org</font></table>
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<hr noshade>
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<br>
<br><tt><font size=2>This may be true is cartography. It's only partly
true in geodesy --<br>
some authors make a distinction, e.g.,<br>
<br>
W. A. Heiskanen and H. Moritz, Physical Geodesy,<br>
(Freeman, San Fransisco, 1967)<br>
<br>
use spheroid to refer to an approximately spherical shape. (This
was,<br>
presumably, its original meaning.)<br>
<br>
<br>
On 10/09/11 19:43, Noel Zinn (cc) wrote:<br>
> "Spheroid" and "ellipsoid" are synonyms for the
same thing in geodesy and<br>
> cartography.<br>
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