[Proj] apply plane rotation after transverse Mercator projection

Mikael Rittri Mikael.Rittri at carmenta.com
Wed Oct 12 13:46:06 EST 2011

The Rosenmund projection is called +proj=somerc (Swiss Oblique Mercator),
but I don't see why that should be better than the RSO (+proj=omerc) for this purpose.

I don't think there is any built-in support in Proj.4 to do an arbitrary rotation of the projected plane.
However, if you just need to rotate 90, 180 or 270 degrees, then you could perhaps use the +axis parameter.

Best regards,

Mikael Rittri

Den 12 okt 2011 kl. 15:53 skrev "Clifford J Mugnier" <cjmce at lsu.edu<mailto:cjmce at lsu.edu>>:

I don't know if PROJ4 has it, but the Rosenmund projection as used in Switzerland sounds like what you want.

Clifford J. Mugnier, C.P., C.M.S.
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From: proj-bounces at lists.maptools.org<mailto:proj-bounces at lists.maptools.org> on behalf of Duffy, Garret
Sent: Wed 12-Oct-11 06:13
To: <mailto:proj at lists.maptools.org> proj at lists.maptools.org<mailto:proj at lists.maptools.org>
Subject: [Proj] apply plane rotation after transverse Mercator projection


I would like to design a projection that is similar to a TM projection except append the parameter "XY_Plane_Rotation", i.e. rotate the XY axes.  Is this possible to do in PROJ4?  I note the tmerc doesn't have an alpha parameter or similar.  I already tried using RSO but it's overkill for what I want to do, all I want to do is apply a simple cartesian rotation to the projected XY axes.

Another thing I tried was editing a PRJ file for a TM projected data and then appending "PARAMETER["XY_Plane_Rotation",XX]" to the file but that doesn't seem to work.

Do I have to define a custom PROJCS that is based on tmerc but allows for the XY_Plane_Rotation parameter?

Any suggestions gratefully would be (very) gratefully received as I have been trying to do this supposedly simple thing all week.



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