Many thanks Keith, putting control points on the intersections is a
great idea.   I'll give that a try.

Clay

On Dec 7, 2007, at 11:25 AM, Keith Jenkins wrote:

> Hi, Clay.
>
> Your details are daunting, but I'll try to help :)
>
> Since your map is lucky enough to have them, I'd suggest using the
> intersections of the latitude/longitude lines as your control points.
> Besides offering nice round numbers, they are evenly spaced across the
> map.  Try it first with every 10 degrees, and if that isn't good
> enough, go with every 5 degrees.
>
> The projection of the original map is not so important in this
> process, since you are using control points.  And the datum really
> doesn't matter here: the difference between WGS84 and NAD83 is going
> to be less than the width of the lines on a map of this scale.  So I
> wouldn't worry too much about the map having been folded, either.
>
> As for relying on open source tools, you should be in good hands with
> GDAL, GeoServer, and OpenLayers.
>
> Good luck!
>
> Keith