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Thanks to all (and particularly to Paul Hirose and Herbert Prinz) who
contributed to solving the conversion problem between lat/long and UTM.

My implementation of the same algorithm has got me as near as I really need
(50 metres error, in a test, is quite sufficient for my needs) but it's
obviously not quite right yet, so I will try to track down that final small
error(s?).

However, the motivation has gone away, somewhat. I had the new "Atlas of
Lewis and Clark in Missouri" by Harlan and Denny, on order. Jim Harlan, by
e-mail, had informed me that its projection was to UTM zone 15, not
lat/long.

The atlas arrived yesterday, and a handsome publication it is, indeed. I
will assess it in a list-mailing when I have got a bit more familiar with
its contents. But a big disappointment was that the maps, though on UTM
projection, offer no UTM grid, or any other grid, nor even any tick-marks
around the edges.

This was, to say the least, frustrating, for my purposes. I wished to
relate modern assessments of positions of Lewis and Clark's observation
points, to their own calculated lat and longs, after correcting some of
their errors.

Harlan, aware of my problem, has kindly supplied his estimates of lat and
long of some of their earlier campsites, and promises to supply the rest.
By interpolation between them, I can derive Harlan's estimates of noon
observation positions, in lat/long, to a useful precision.

Thank you, all.

George.


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contact George Huxtable by email at george@huxtable.u-net.com, by phone at
01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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