My two cents: I missed the original post, but I suggest you have TWO
subroutines (preferably within a module).
ll2xy (lat/lon to x/y)
and
xy2ll (x/y to lat/lon)
Of course, each one would accept a string of arguments such as projection,
scale, reference lat/longs, map corners, etc, etc.
When working with map coordinates, you should always use latitudes and
longitudes, then convert to x/y before your 'final' plot.
..this makes much more sense then to try mapping x/y from one map to x/y on
another. Topology is not something I want to do, much less, do it well :-)
Generic Mapping Tools could help with this:
http://gmt.soest.hawaii.edu/
Jack
>...map points in one map to a smaller area of another map (a
>scaled-down version of the former map)?
>
>Confused? Me too. Do we have a resident maths genius?
>Or someone with at least a basic education in the subject?
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