Re: Lisp geographic software

On Mon, 30 May 2005 21:38:58 +0100, <ocorrain@xxxxxxxxx> wrote:
>
> A modified question: are there any public implementations of
> cartographic projections (e.g. Mercator, Peters) in lisp that would be
> accessible?

The Mercator projection is rather simple, something with atan if I
recall correctly from years ago (WikiPedia probably has the exact
form). When I needed some global plotting of an interesting dataset,
I just took a world map, taped it to a photocopy machine and made a
bunch of identical maps to paperfeed a pen plotter. A little test
routine gave me plotter coordinates to map references, then I added
the simple Mercator projection and plotted a dozen copies of my
dataset. You can probably use some CIA world data gif file as a
background to overplot nowdays, with one of the graphics packages that
will plot a symbol at an x-y screen coordinate.

Any other map projection is simple, I think you are looking for more
than merely a projection definition.


--
With sufficient thrust, pigs fly fine.
.

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