The problem is best summarised by Mikael Rittri here; http://osgeo-org.1803224.n2.nabble.com/RSO-gamma-and-Hotine-Oblique-Mercator-Variant-A-td6256795.html
He has also created a ticket here: http://trac.osgeo.org/proj/ticket/104 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: http://georepository.com/crs_3375/GDM2000-Peninsula-RSO.html See the remarks in the metadata for the projection: If using Hotine Oblique Mercator (variant B) method (code 9815), Ec=472830.426 m, Nc=442454.099 m. Maybe there something similar for your projection. *Hilmy* On Mon, Jun 27, 2011 at 1:46 AM, Howard Y <[email protected]> wrote: > Thank you for the suggestions, Steve. > > The projection parameters for the list you derived are pretty much the same > as the PROJ4 format of EPSG:3078, with the exception of the display unit (m > vs ft) and the datum (NAD27 vs NAD83). I've tried most of them (but not > the > NAD27 versions), and I've also tried my own hand in cranking out the > PROJ4-type parameters based on Michigan state's definition of GeoRef, but > none of them worked. > > Looking at the 2007 thru 2009 threads in this forum, it appears that the > problem lies in the difference between "Oblique Mercator" and something > called "Hotine Oblique Mercator," with the "Hotine" version being the one > that GeoRef apparently uses. But that's way beyond my level of > comprehension, and hence my appeal to the folks in this forum. Past > appeals > by others to developers of QGIS, for example, have always resulted in their > suggestion to post a request for a fix here. > > Thanks again for your input! Cheers! > > Howard > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/Michigan-GeoRef-Michigan-Oblique-Mercator-EPSG-3078-tp6517423p6517746.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
_______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
