[PROJ] Transverse and oblique Mercator

[Clifford J Mugnier]

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.

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From: PROJ <proj-bounces at lists.osgeo.org> on behalf of Pierre Abbat <phma at bezitopo.org>
Sent: Monday, January 20, 2020 7:25:55 AM
To: proj at lists.osgeo.org <proj at lists.osgeo.org>
Subject: Re: [PROJ] Transverse and oblique Mercator

On Sunday, 19 January 2020 06.28.29 EST Kristian Evers wrote:
> Pierre,
>
> You can download a digital copy of Snyders book at
> 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

As far as I can figure out, Hotine and Rosenmund are the same, except for the
size of the sphere that the ellipsoid is conformally projected to. Hotine
claims to be equidistant along a geodesic, but it can't be, unless the
geodesic is the equator (in which case it's just axial Mercator). Laborde is
different, but the book doesn't give formulas for Laborde.

Pierre

--
The gostak pelled at the fostin lutt for darfs for her martle plave.
The darfs had smibbed, the lutt was thale, and the pilter had nothing snave.



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