[Proj] proj4 specifications for a rotated latlon grid on a sphere?

[Martin Ivanov]

Dear PROJ4 users,

I have a rotated latitude-longitude grid with coordinates of the north 
pole POLE_LAT=39.25 and POLE_LON=-162.
The data are on a sphere with radius 6371 km. Is it possible to define 
proj4 specifications for this grid, so that I can make
coordinate transformations? Most interesting for me would be how to 
specify the towgs84 parameter.

Any suggestions will be appreciated.

Best regards,

-- 
Dr. Martin Ivanov
Eberhard-Karls-Universität Tübingen
Mathematisch-Naturwissenschaftliche Fakultät
Fachbereich Geowissenschaften
Water & Earth System Science (WESS)
Hölderlinstraße 12, 72074 Tübingen, Deutschland
Tel. +4970712974213