[OSRS-PROJ] Winkel Tripel or Winkel 3 Projection

[Gerald I. Evenden]

On Sat, 2003-08-23 at 10:17, Paul Selormey wrote:
> Thanks for the reply and the information.
> 
> > Winkel Tripel is in the proj system.
> 
> Sorry, I found it in the Aitoff implementation file, I was looking for
> a file solely Winkel Tripel :-( since there as one for Winkel 1 and 2.

Many projections have very similar computations and can be
processed with one set of equations that have constants altered
or minor path variations.  These are lumped into a single
C file with multiple initialization entry points.

> > Can't find any reference to Winkel III in Snyder's works.
> > If you have a reference, I'd like to look at it.
> 
> I do not know, but is it different from Winkel Tripel? I was looking for
> something of compound projections to satisfy the OpenGIS interfaces.
> We found a Japanese document which named one as Winkel 3. ESRI's
> "Understanding Map Projections" book named Winkel Tripel, not using
> the term compound projection anyway.

I think the term "composite" needs some defining.  At first
I thought you meant something like Goode's projection where
two different projections are used in two different regions.
In Winkel-Tripel, the Aitoff projection and the equirectangular
are averaged.

The time-line for W1, W2 and WT is 1914, 1915 and 1921 so
WT might be Winkel's third projection. (?)

> > > Finally, is Gerald I. Evenden's site down?
> > > http://members.bellatlantic.net/~vze2hc4d/proj4/
> >
> > Not that I know of.  I clicked the above and it came up.
> >
> > > I have tried several times to access it without success.
> 
> I do not know why, I was using IE 6.x. I have just tried it again in
> Mozilla Firebird and without success. The firebird displayed a message box
> 
> "The connection was refused when attempting to contact
> members.bellatlantic.net"
> 
> Best regards,
> Paul.
> 
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-- 
Gerald I. Evenden <gerald.evenden at verizon.net>

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