[Proj] Implementation(s) for Oblique Stereographic

Frank Warmerdam warmerdam at pobox.com
Wed Oct 26 16:42:46 EDT 2005

On 10/26/05, Gerald I. Evenden <gerald.evenden at verizon.net> wrote:
> The Oblique Stereographic code in EPSG 7.2 IS NOT Roussilhe. The EPSG code
> is the Double Projection method using conformal conversion of the ellipsoid
> to the sphere and then using the spherical stereographic projection.
> Roussilhe is not mentioned in the EPSG 7.2 publication.
> Libproj4 provides for three (3) different Oblique Stereographics
> projections: "+proj=stere" for the USGS version (Snyder), "+proj=sterea" for
> the Double Projection method and "+proj=rouss" based upon Roussilhe's 1922
> paper.
> The description of the +proj=sterea projection in the libproj4 manual looks
> different from the EPSG description because the process is organized so that
> the conformal conversion software is also used by the Krovak and Swiss
> projections.


Thanks for your clarification. I have put it into the bug report.


Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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