[gdal-dev] Re: Michigan GeoRef - Michigan Oblique Mercator - EPSG:3078

[Hilmy Hashim]

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 <hayamaguchi at gmail.com> 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.
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