[OSRS-PROJ] Roussilhe Oblique Stereographic
gerald.evenden at verizon.net
Fri Mar 19 21:19:13 EST 2004
A bit stalled on the inverse---part of the problem is that some of the
equations do not make sense and I suspect typos. As a last resort I
penned an email to the address at the bottom of the reference site
on the off chance he/she can read English.
Reviewed one of the sites suggested earlier (by :Lamparski)
which has even another quasi-stereographic. Sigh. This one
is single step and looks vaguely like the Qihe,Snyder,Tobler version.
I said vaguely! There are a couple of *odd* things about the equations.
One thing about the OST version is that it goes through isometric
latitude rather than conformal latitude. Isometric is messy as it
behaves like Mercator y and goes infinite as you proceed to the
poles. Conformal latitude behaves itself nicely.
The Lamparski site is bizarre because latitude is noted as "b" in
the equations for x-y but it is usually noted "B" everywhere else. He
uses "b" earlier as minor axis length.
Probably should spend the time to get the original reference but I
am not sure that is what is truly being used by the Poles.
I sent an email to Tobler but I have not received a response.
To paraphrase and old US TV program: "Will the real Roussilhe
Polish Quasi-Stereographic projection please stand up."
Jerry and the low riders: Daisy Mae and Joshua
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