The problem is best summarised by Mikael Rittri here; <a href="http://osgeo-org.1803224.n2.nabble.com/RSO-gamma-and-Hotine-Oblique-Mercator-Variant-A-td6256795.html">http://osgeo-org.1803224.n2.nabble.com/RSO-gamma-and-Hotine-Oblique-Mercator-Variant-A-td6256795.html</a><div>
<br></div><div>He has also created a ticket here: <a href="http://trac.osgeo.org/proj/ticket/104">http://trac.osgeo.org/proj/ticket/104</a></div><div><br></div><div>Unfortunately, I'm still waiting for the issue to be resolved. A workaround is to use offset northings and eastings as suggested by epsg here for the peninsular RSO: <a href="http://georepository.com/crs_3375/GDM2000-Peninsula-RSO.html">http://georepository.com/crs_3375/GDM2000-Peninsula-RSO.html</a> See the remarks in the metadata for the projection:</div>
<div><br></div><div><span class="Apple-style-span" style="color: rgb(153, 153, 153); font-family: arial, sans-serif; font-size: 13px; line-height: 19px; background-color: rgb(250, 250, 250); ">If using Hotine Oblique Mercator (variant B) method (code 9815), Ec=472830.426 m, Nc=442454.099 m.</span></div>
<div><span class="Apple-style-span" style="color: rgb(153, 153, 153); font-family: arial, sans-serif; font-size: 13px; line-height: 19px; background-color: rgb(250, 250, 250); "><br></span></div>Maybe there something similar for your projection.<div>
<br><div><br clear="all"><span style="font-size:large"><i><font face="garamond, serif"><b><font color="#FF6600">Hilmy</font></b></font></i></span><br>
<br><br><div class="gmail_quote">On Mon, Jun 27, 2011 at 1:46 AM, Howard Y <span dir="ltr"><<a href="mailto:hayamaguchi@gmail.com">hayamaguchi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Thank you for the suggestions, Steve.<br>
<br>
The projection parameters for the list you derived are pretty much the same<br>
as the PROJ4 format of EPSG:3078, with the exception of the display unit (m<br>
vs ft) and the datum (NAD27 vs NAD83). I've tried most of them (but not the<br>
NAD27 versions), and I've also tried my own hand in cranking out the<br>
PROJ4-type parameters based on Michigan state's definition of GeoRef, but<br>
none of them worked.<br>
<br>
Looking at the 2007 thru 2009 threads in this forum, it appears that the<br>
problem lies in the difference between "Oblique Mercator" and something<br>
called "Hotine Oblique Mercator," with the "Hotine" version being the one<br>
that GeoRef apparently uses. But that's way beyond my level of<br>
comprehension, and hence my appeal to the folks in this forum. Past appeals<br>
by others to developers of QGIS, for example, have always resulted in their<br>
suggestion to post a request for a fix here.<br>
<br>
Thanks again for your input! Cheers!<br>
<br>
Howard<br>
<font color="#888888"><br>
--<br>
View this message in context: <a href="http://osgeo-org.1803224.n2.nabble.com/Michigan-GeoRef-Michigan-Oblique-Mercator-EPSG-3078-tp6517423p6517746.html" target="_blank">http://osgeo-org.1803224.n2.nabble.com/Michigan-GeoRef-Michigan-Oblique-Mercator-EPSG-3078-tp6517423p6517746.html</a><br>
</font><div><div></div><div class="h5">Sent from the GDAL - Dev mailing list archive at Nabble.com.<br>
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