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<div style="direction: ltr;">Like I said, Laborde and Rosenmund are Double Projections. (Spherical projections as first step.). Hotine goes first to the aposphere which is shaped like a turnip. </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> Monday, January 20, 2020 7:25:55 AM<br>
<b>To:</b> proj@lists.osgeo.org <proj@lists.osgeo.org><br>
<b>Subject:</b> Re: [PROJ] Transverse and oblique Mercator</font>
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<div class="PlainText">On Sunday, 19 January 2020 06.28.29 EST Kristian Evers wrote:<br>
> Pierre,<br>
> <br>
> You can download a digital copy of Snyders book at<br>
> <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpubs.er.usgs.gov%2Fpublication%2Fpp1395&data=02%7C01%7Ccjmce%40lsu.edu%7C15534768979d4535841c08d79dac527c%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C0%7C637151235750835698&sdata=nigN4%2BseRhC5A%2FXk8GgzGBmlBOan915BtUk%2FUaZhBt4%3D&reserved=0">
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpubs.er.usgs.gov%2Fpublication%2Fpp1395&data=02%7C01%7Ccjmce%40lsu.edu%7C15534768979d4535841c08d79dac527c%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C0%7C637151235750835698&sdata=nigN4%2BseRhC5A%2FXk8GgzGBmlBOan915BtUk%2FUaZhBt4%3D&reserved=0</a><br>
<br>
As far as I can figure out, Hotine and Rosenmund are the same, except for the <br>
size of the sphere that the ellipsoid is conformally projected to. Hotine <br>
claims to be equidistant along a geodesic, but it can't be, unless the <br>
geodesic is the equator (in which case it's just axial Mercator). Laborde is <br>
different, but the book doesn't give formulas for Laborde.<br>
<br>
Pierre<br>
<br>
-- <br>
The gostak pelled at the fostin lutt for darfs for her martle plave.<br>
The darfs had smibbed, the lutt was thale, and the pilter had nothing snave.<br>
<br>
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