[OSRS-PROJ] Donald Elliptic Projection for AT&T V&H Coordinates?

[Gerald Evenden]

Before preceeding further, I am curious about what code referred to in your first
sentence and where was if from?  Was this code in the Java scripts?

There does appear to be problems in that your execution does not seem to
do very well with the htlt? example numbers.  I didn't find the exact equivalent
of what you used on their web pages.  Could you give a path to the web
page you used below.

Thank you.

Duncan Agnew wrote:

> Being interested in puzzles, I worked through the code (more or less)
> and rewrote it in a language I prefer. I append the result. I've added
> some explanatory comments, although some mysteries remain--the original
> Donald notes would be needed to clear these up. Apparently John Snyder
> had a copy--anyone know where it might now be?
>
> I agree with a comment that, for something like this, the procdure
> is what it is, correct or not--it is purely conventional. So here
> are some results, with what comparison I could make.
>
>     lat         long                 V         H       Comparison
>
> 37 42 14.69  82 39 15.27          6363.235  2250.700   (one end)
> 41 02 55.53 112 03 39.35          7519.455  7107.410   (other end)
> 39 04 41.68  77 00 04.58          5587.002  1600.999   5587 1601 (1)
> 39 06 09.26  76 50 59.97          5568.001  1582.999   5568 1583 (1)
> 38 53 50.30  77 01 36.47          5621.999  1582.002   5622 1582 (1)
> 30 16 28.82  97 44 25.19          9003.475  3996.792   9004 3995 (2)
>
> (1) - htlt.com V&H converter (examples on their Web page)
> (2) - Peter H. Dana's coordinate systems Web page example

    ... etc.

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