[Proj] Rotated Polar Stereographic Projection in Proj4
ajarosch at eos.ubc.ca
Thu Mar 5 16:58:39 EST 2009
Gerald I. Evenden wrote:
> On Thursday 05 March 2009 2:40:53 pm Alexander Jarosch wrote:
>> I have a rather simple question, but I could not find any documentation
>> so far on how to do this with proj4. A college of mine has maps on a
>> "polar stereographic projection" with the following details:
>> Pole_lat = 50.0
>> Pole_lon = -150.0
>> Central_lat = 50.0
>> Central _lon = -126.0
>> These are the definitions he gave me. Now I think this is a
>> stereographic projection with a given pole lat/lon and should maybe not
>> be called polar stereographic, but that is not the problem. I want to
>> set up proj4 (or cs2cs for that matter) to this projection to transform
>> coordinates from lat/lon and I assume the same ellipsoid. My problem is
>> that I did not find any documentation on how to set up this rotated
>> stereographic projection with proj4.
>> Any help would be really appreciated.
> Appears to be a truely oblique projection and not in the tradition of
> proj=stere where the pole is on the CM.
> Is a spherical earth used? In the case of a spherical earth one could use the
> combination of proj=ob_tran and stere. Otherwise, if it is a azimuthal
> stereographic, I do not know of anyway proj or libproj could handle it
> without development.
> Sheeesh. I wonder what the rational for this beast was? Class exercise?
Nope that beast comes from a climate model ;-). Anyway, is it fairly
simple to work out the combination of +proj=ob_tran and stere for this
projection I mentioned, because it assumes a spherical earth, like
almost all climate models.
Alexander H. Jarosch
Department of Earth and Ocean Sciences,
The University of British Columbia,
6339 Stores Road,
Vancouver, British Columbia
Canada, V6T 1Z4.
Tel.: +1 604 822 3063
Fax.: +1 604 822 6088
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