[Proj] apply plane rotation after transverse Mercator projection

[Mikael Rittri]

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
Carmenta
Sweden
http://www.carmenta.com

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.
Chief of Geodesy,
Center for GeoInformatics
Department of Civil Engineering
Patrick F. Taylor Hall 3531
LOUISIANA STATE UNIVERSITY
Baton Rouge, LA  70803
Voice and Facsimile:  (225) 578-8536 [Academic]
Voice and Facsimile:  (225) 578-4578 [Research]
Cell: (225) 328-8975 [Academic & Research]
Honorary Life Member of the
Louisiana Society of Professional Surveyors
Fellow Emeritus of the ASPRS
Member of the Americas Petroleum Survey Group


________________________________
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


Hi,

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.

Regards,

Garret

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