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<body bgcolor="#FFFFFF"><div>The Rosenmund projection is called +proj=somerc (Swiss Oblique Mercator),</div><div>but I don't see why that should be better than the RSO (+proj=omerc) for this purpose.</div><div><br></div><div>I don't think there is any built-in support in Proj.4 to do an arbitrary rotation of the projected plane.</div><div>However, if you just need to rotate 90, 180 or 270 degrees, then you could perhaps use the +axis parameter. </div><div><br></div><div>Best regards,</div><div><br></div><div>Mikael Rittri</div><div>Carmenta</div><div>Sweden</div><div><a href="http://www.carmenta.com">http://www.carmenta.com</a><br></div><div><br>Den 12 okt 2011 kl. 15:53 skrev "Clifford J Mugnier" <<a href="mailto:cjmce@lsu.edu">cjmce@lsu.edu</a>>:<br><br></div><div></div><blockquote type="cite"><div>
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<div dir="ltr"><font face="Times New Roman" color="#000000" size="2">I don't know if PROJ4 has it, but the Rosenmund projection as used in Switzerland sounds like what you want.</font></div>
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<div class="MsoNormal" style="MARGIN: 0in 0in 0pt"><span lang="DE" style="FONT-SIZE: 10pt; mso-ansi-language: DE">Clifford J. Mugnier, C.P., C.M.S.<o:p></o:p></span></div>
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<font face="Tahoma" size="2"><b>From:</b> <a href="mailto:proj-bounces@lists.maptools.org">proj-bounces@lists.maptools.org</a> on behalf of Duffy, Garret<br><b>Sent:</b> Wed 12-Oct-11 06:13<br><b>To:</b> <a href="mailto:proj@lists.maptools.org"><a href="mailto:proj@lists.maptools.org">proj@lists.maptools.org</a></a><br><b>Subject:</b> [Proj] apply plane rotation after transverse Mercator projection<br></font><br></div>
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<p><span lang="en-ca"><font face="Arial">Hi,</font></span> </p>
<p><span lang="en-ca"><font face="Arial">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.</font></span></p>
<p><span lang="en-ca"><font face="Arial">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.</font></span></p>
<p><span lang="en-ca"><font face="Arial">Do I have to define a custom PROJCS that is based on tmerc but allows for the XY_Plane_Rotation parameter?</font></span> </p>
<p><span lang="en-ca"><font face="Arial">Any suggestions gratefully would be (very) gratefully received as I have been trying to do this supposedly simple thing all week.</font></span></p>
<p><span lang="en-ca"><font face="Arial">Regards,</font></span> </p>
<p><span lang="en-ca"><font face="Arial">Garret</font></span><span lang="en-us"></span> </p></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Proj mailing list</span><br><span><a href="mailto:Proj@lists.maptools.org">Proj@lists.maptools.org</a></span><br><span><a href="http://lists.maptools.org/mailman/listinfo/proj">http://lists.maptools.org/mailman/listinfo/proj</a></span></div></blockquote></body></html>