Re: world to xy

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Javier Abadia Miranda (abadia++at++sgonyx.ita.es)
Tue, 28 Oct 1997 09:05:53 +0100

Well, there are some ecuations that solve the
Lat/Lon to UTM problem and the inverse one.

These ecuations were published in an Italian
cartography journal as an alternative to the
exact expressions that involve complex number
functions.

I've written a pair of functions
utm2geo() and geo2utm() that implement
this ecuations.

Code is a bit of a mess, so let me a day or so
to polish it up and I promise to post these
functions or e-mail them to those of you that
show some interest

I'm developing geo2lambert() and lambert2geo()
also.

Note: I had to investigate for some time till
I reached a source that showed a solution to
this problem in a clear way.

Now a question: Do you have a method to find out
sun position given Latitude of the place, day of
year and time of day ?

And: Do you have a method to correctly position
the 3010.star sphere in a scene honoring Latitude
time of "night" and day of year ?

I don't need absolute exactitude, but I would
apreciate a clear answer, possibly including source.

Thanks.

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