[OSRS-PROJ] PROJ.4 usage in mapserver system - orthographicusage thread

Gerald I. Evenden gerald.evenden at verizon.net
Wed Aug 20 13:08:20 EDT 2003

Any of the perspective routines will cause forward errors when the
points are "invisible."  Orthographic is just the extreme case where
the focal point is at infinity.  Near Sided Perspective (nsper) will
also have invisible points.  Stereographic also fails for the
apodal point.

On Wed, 2003-08-20 at 12:30, Frank Warmerdam wrote:
> Steve Lime wrote:
> > Has this discussion gone on off the list, I've seen no other follow-ups?
> > As one of the lead MapServer developers I'm certainly interested in
> > seeing problems resolved if they exist. I'm not however, an expert in
> > the current projection support within the software. I'm curious how, in
> > practice, other graphically oriented systems deal with the problem. 
> Steve,
> It is my intention to try and address the orthographic problem in mapserver
> - really the problem is that most, if not all, of the mapproject.c functions
> don't check for failures coming out of PROJ.4.  I have asked the original
> reporter to submit a bug report in the MapServer bugzilla which I don't
> think has happened yet.
> Best regards,
Gerald I. Evenden <gerald.evenden at verizon.net>

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