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<div style="direction: ltr;">No. Same ellipsoid, same name. Different DATUMS, different names.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> PROJ <proj-bounces@lists.osgeo.org> on behalf of Pierre Abbat <phma@bezitopo.org><br>
<b>Sent:</b> Friday, February 7, 2020 1:30:10 PM<br>
<b>To:</b> proj@lists.osgeo.org <proj@lists.osgeo.org><br>
<b>Subject:</b> [PROJ] GRS80 ellipsoid off-center</font>
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<div class="PlainText">I'm at the North Carolina surveyors' conference, and yesterday I attended the
<br>
talk about the new coordinate systems coming in 2022. The projection will <br>
still be conformal conic, with some changes. There will be one parallel and a <br>
scale factor instead of two parallels. (The representations are equivalent, <br>
and I've written code that converts two parallels into one parallel and a <br>
scale factor.) The false easting will be a round number in metric rather than <br>
feet converted to meters and rounded to the centimeter. And the ellipsoid will <br>
be centered at the center of mass of the earth, rather than a few meters off.<br>
<br>
I asked the speaker what name to use to distinguish the two ellipsoids. He <br>
didn't know, said they're both GRS80. I mentioned that the Greek ellipsoid <br>
(HGRS87, but I didn't remember the name at the moment) has the same shape, but <br>
is offset to fit Greece better, and has its own name. Is there a retronym to <br>
distinguish the previous GRS80, which turned out to be slightly offset, from <br>
GRS80 centered at the center of the earth?<br>
<br>
Pierre<br>
-- <br>
La sal en el mar es más que en la sangre.<br>
Le sel dans la mer est plus que dans le sang.<br>
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