[Proj] Re: URGENT Non-existent Projection Definition (Oblique Mercator

[Oscar van Vlijmen]

> From: "Clever, Max"
> Date: Mon, 29 Jan 2007 07:00:12 +0100
> Subject: URGENT Non-existent Projection Definition (Oblique Mercator

> .... Here is a comparison using the example lat long that you and Melita used,
> and also an extra point.  Your calculations using "type = 5" and "norot,
> no_off" from July 23, 2006 appear to exactly match the Autodesk points  The
> following two points were transformed using Michigan Georef to Lat Long NAD83
> in AutoDesk Map 2007.
 
> Point 1
> -86 Longitude NAD83
> 43 Latitude NAD83
> 499864.5000769 X georef meters Correct
> 272108.8592635 Y georef meters Correct

> Here are my results of Lat Long NAD83 to Michigan Georef using the "+no_uoff"
> flag on Point 1
> cs2cs +proj=latlong +datum=NAD83 +to +proj=omerc +k_0=0.9996
> +alpha=337.25555555555556 +lat_0=45.30916666666667 +lonc=86
> +x_0=2546731.496 +y_0=-4354009.816 +no_uoff +ellps=GRS80
> +datum=NAD83 +units=m
> -1691884.49 X, 10656222.28 Y

Please try again with +lonc=-86 (it's West!)
I can reproduce your -1691884.49 X, 10656222.28 Y exactly with lonc = +86
deg, so you must be able to reproduce the AutoDesk values with the correct
lonc!
Hope this will help.