> USGS sea level reading - 694.10 = Saint Paul City Datum
Phil, are you sure that's Mean Sea Level ? Sounds to me more like an
ellipsoidal height (meaning the theoretical model of the entire earth's
surface that datums like WGS-84 are based on). There are of course, some
places that are below MSL, but even Death Valley is only 282 feet below.
> Sometimes a surveyor will not call for benchmarks and just pick a random
> place on the site and call it "100.00".
Which of course is the same basic process that produced your "Saint Paul
City" datum.
<G>
Randall
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