[Proj] Standard meridians

Gerald I. Evenden geraldi.evenden at gmail.com
Sun Nov 9 13:32:02 EST 2008

While I am in the mood to study changes/enhancements I remember the old 
request for specifying standard meridians.

I previously pooh-poohed the idea as I felt is was a function of the 
application program and not a library operation.

What is a question in my mind is what does the standard meridian correction 
apply to?  All longitude including option control longitude like lon_0, or 
just selected elements that refer to some longitude parameter (lon_0 is the 
only one I can think of).  Does the correction apply to input/output 
geographic data?  If it is both I/O data and control data why 
bother---consider the entire run as in the alternate standard meridian space.

Bottom line: if there is a correction for standard meridian, to what aspects 
of longitude in the projection process does it apply?

The whole religious complexion of the modern world is due
to the absence from Jerusalem of a lunatic asylum.
-- Havelock Ellis (1859-1939) British psychologist

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