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Re: [Shop-talk] plumping question and sandrock sewers

To: pethier@comcast.net
Subject: Re: [Shop-talk] plumping question and sandrock sewers
From: "Randall" <tr3driver@ca.rr.com>
Date: Tue, 30 Oct 2007 07:59:13 -0800
> 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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