[PROJ] tmerc projection, with custom rotation

[Kristian Evers]

Nyall

If omerc is the answer to the question have a look at this issue https://github.com/OSGeo/proj.4/issues/523 <https://github.com/OSGeo/proj.4/issues/523>
which goes into details with the quirks of this projection. I am afraid the documentation isn’t very helpful
at this time.

If omerc isn’t what you need, take a look at ob_tran: https://proj4.org/operations/projections/ob_tran.html <https://proj4.org/operations/projections/ob_tran.html>


/Kristian

> On 8 Jan 2019, at 08:18, Thomas Knudsen <knudsen.thomas at gmail.com> wrote:
> 
> Is the Oblique Mercator projection, available as proj=omerc, what you are searching for?
> 
> Den tir. 8. jan. 2019 kl. 07.06 skrev Nyall Dawson <nyall.dawson at gmail.com <mailto:nyall.dawson at gmail.com>>:
> Hi list,
> 
> It's my understanding that this is only possible with the Proj 5
> pipeline API and the new helmert transform, but just in case:
> 
> Is it possible in proj v4 to define a custom projection, based on a
> utm/tmerc projection, with a custom rotation applied? (and if so,
> what's the syntax for this?)
> 
> Thanks!
> Nyall
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