Click here to see the SAS code.
Click here to see the example.

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The technique used to produce this map is similar to geologic_info.htm
except that in this one long/lat coordinates are used to line up the map
with the image.

I spend a few minutes of guesswork & trial-and-error guessing the
projection used for the image, and the long/lat of the bottom/left
and top/right corner (which I used when I annotate the image onto
the map).

As you probably guess, this technique is somewhat "flawed", because
the image (with the contour & rivers) is already projected, and I'm
combining it with the unprojected map coordinates), and then projecting
the both of them (which is actually re-projecting the projected image
yet again).  Therefore this technique will only work on relatively small
map areas, and will not work well for maps nearer the north & south poles.

But for maps in the middle latitudes, it can be a useful technique
which lets you handle the images in a somewhat generalizable way with 
the maps.  It's not a perfect technique, but I thought it useful enough
to share.  (The geologic_info.htm technique is what you'll need for maps
in the higher latitudes, or that cover a larger area - that technique is
not nearly as generalizable, but it's what you'll need).

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