Subject: Re: VTNYQC - been done?<br/>
Date: Nov 12, 2002 @ 00:48<br/>
Author: acroorca2002 (&quot;acroorca2002&quot; &lt;orc@...&gt;)<br/>
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<div id="ygrps-yiv-1482896810">--- In BoundaryPoint@y..., &quot;Meridien24&quot; &lt;meridien24@y...&gt; wrote:<br/>
<blockquote><span title="ireply"> &gt; TopoZone seems to have the border misplaced!... Ft <br/>
 </span></blockquote>Montgomery isn&#39;t <br/>
<blockquote><span title="ireply"> &gt; even there!  Weird.  Maptech&#39;s server must be down, I keep <br/>
 </span></blockquote>getting <br/>
<blockquote><span title="ireply"> &gt; 404&#39;s... I&#39;ll use TerraServer for today.<br/>
<br/>
 </span></blockquote>terraserver shows it just as well as maptech<br/>
& topozone often crops the boundaries entirely <br/>
making it a nightmare for bounders & pointers<br/>
<br/>
<br/>
i will certainly be rooting for the ice<br/>
<br/>
will you be using a gps to bag the point on the ice<br/>
or just feeling for the midpoint between the monuments<br/>
<br/>
<br/>
i have been playing with some coords<br/>
<br/>
to begin with <br/>
the usgs says flatly<br/>
in boundaries of the united states & the several states<br/>
that vtnw & nyne coincide & fall at <br/>
nad27 45d00m38s9 x 73d20m38d9<br/>
but they dont say where they got that from<br/>
& we know this book & their maps are full of errors<br/>
<br/>
checking these coords against the usgs depiction of the tripoint <br/>
on the paper topo quad <br/>
may or may not tend to substantiate them<br/>
but even the largest scale topo cant match their accuracy level<br/>
<br/>
<br/>
by contrast <br/>
the usually reliable ibc places mon 644 at <br/>
nad27 45d00m38s885 x 73d20m07s632<br/>
& mon 645a at <br/>
nad27 45d00m87s x 73d21m12s44<br/>
<br/>
since the 2 monuments appear on the topo to be equidistant <br/>
from their respective banks<br/>
& therefore very nearly equidistant from the middle of the river<br/>
or lake<br/>
or whatever you call it there<br/>
then it might be better to compute the tripoint position<br/>
by averaging these monument coords<br/>
than to just swallow the usgs coords whole<br/>
<br/>
such an averaging will produce a tripoint position of<br/>
nad27 45d00m38s3775 x 73d20m40s036<br/>
which tho probably unreliable beyond tenths of a second<br/>
still seems far more credible than the usgs positioning<br/>
which incidentally has the additional defect <br/>
of placing the tripoint north of both monuments<br/>
yikes<br/>
for how could that be true<br/>
<br/>
while neither position is terribly punctilious<br/>
they both still afford target areas of about 10 foot circles<br/>
whose centers are more than 100 feet apart<br/>
<br/>
but so long as you are out there<br/>
in view of the uncertainty<br/>
you might want to skate figure 8s around them both <br/>
<br/>
<br/>
also monument 644 if original dates from 1767<br/>
making it perhaps the oldest demarcation point on caus<br/>
& in fact predating caus as such<br/>
& that might make it a highly desirable target in itself</div>