[OSRS-PROJ] Oblique Stereographic

Gerald I. Evenden gerald.evenden at verizon.net
Tue Mar 4 10:37:22 EST 2003

Unfortunately, the math presentation in the EPSG Guide 7 is a
horror story.  First, be sure to get the pdf version as my browser,
and I suspect others also, make a mess of the html math. 
I do use the Guide as a reference when dealing with other sources
and in trying to determine which "version" to use.  Unlike 
Snyder-like sources, many are not suitable for program development.
This is the reason I now make sure I have a LaTeX document file
that I work from when doing the coding.

I hope that the readers of my pdf files find the math clear,
complete and unambiguous---something from which you can code a
procedure.  I limit the math to the kernel of the projection
and omit all claptrap associated with cadestral usage such
as false eastings, etc.. This is taken care of by the outer
layer of proj.  Also, the kernel is written for the unit
sphere or ellipsoid (a=1) so it ends up that the only thing
of concern is the eccentricity factor.

On Tue, 2003-03-04 at 00:54, Administrator wrote:
> I have been trying to get through the math and have made little
> progress, so if you want to take a whack at it, please do.
> John Novak
> Novacell Technologies
> www.novacell.com
> -----Original Message-----
> From: Frank Warmerdam [mailto:warmerdam at pobox.com] 
> Sent: Monday, March 03, 2003 8:46 PM
> To: osrs-proj at remotesensing.org
> Subject: Re: [OSRS-PROJ] Oblique Stereographic
> Gerald I. Evenden wrote:
> > Is the non-Snyder Oblique/Equitorial (EPSG 9809) done yet?  I noted 
> > some discussion in mid-Feb about it but have not heard of any results.
> > 
> > If nobody is working on it I may as well give it a whack as two 
> > projections in the last three weeks has me on a roll.
> > 
> > BTW, EPSG is somewhat sloppy in their math and elide a good deal of 
> > information.  Secondly, to discuss and refer to their work I wish they
> > would use equation numbers.
> Gerald,
> I don't believe anyone is working on it, and I for one would be very
> grateful to have it added.
> Best regards,

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