Subject: Re: possible explanation ... -&gt; Donald M. Mulcare<br/>
Date: Feb 16, 2005 @ 15:26<br/>
Author: Ron McConnell (&quot;Ron McConnell&quot; &lt;rcmcc@...&gt;)<br/>
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<br/><br/>
<div id="ygrps-yiv-2731795">Following up..<br/>
A google search for<br/>
&quot;Donald M. Mulcare&quot;<br/>
who in 1996 described himself as<br/>
&quot;NGS Advisor to Maryland&quot; <br/>
<br/>
 <a rel="nofollow" target="_blank" href="mailto:donald.mulcare@...">donald.mulcare@...</a><br/>
<br/>
Listed as:<br/>
&quot;Geodesist National Geodetic Survey&quot; [2003]<br/>
&quot;[Maryland] State Highway Administration&quot; [1996]<br/>
<br/>
He is/was apparently with the US NGS<br/>
as recently as 2003.<br/>
<br/>
FYI:<br/>
<br/>
Don Mulcare&#39;s<br/>
 Geodesy Resources Pages<br/>
<br/>
 &lt;<a rel="nofollow" target="_blank" href="http://mywebpages.comcast.net/donaldmulcare/">http://mywebpages.comcast.net/donaldmulcare/</a>&gt;<br/>
<br/>
His specialty seems to be the accuracy<br/>
of vertical height measurements.<br/>
<br/>
From Mulcare&#39;s Geodesy Intro for Maryland:<br/>
<br/>
  WGS 84 with two revisions is<br/>
  consistent with ITRF <br/>
  (International forget-for-the-moment...)<br/>
<br/>
  Magnitude of differences Lat/Long [horizontal?]:<br/>
    NAD 27 and NAD 83 (1986) differ by about 100 ft in MD.<br/>
    NAD 83 (1986) and NAD 83 (1991) differ by about 1 foot in MD.<br/>
    NAD 83 (1991) and ITRF 97 differ by about 3 ft in MD.<br/>
<br/>
Also linked:<br/>
<br/>
Univ. of New Brunswick<br/>
Online Tutorial in Geodesy<br/>
by Petr Vanicek<br/>
   &lt;<a rel="nofollow" target="_blank" href="http://gge.unb.ca/Research/GeodesyGroup/tutorial/tutorial.htm">http://gge.unb.ca/Research/GeodesyGroup/tutorial/tutorial.htm</a>&gt;<br/>
<br/>
<br/>
Cheers, 73,<br/>
<br/>
Ron McC.<br/>
<a rel="nofollow" target="_blank" href="mailto:w2iol@...">w2iol@...</a><br/>
<br/>
Ronald C. McConnell, PhD<br/>
<br/>
 WGS-84: N 40º 46&#39; 57.9&quot;  +/-0.1&quot;<br/>
         W 74º 41&#39; 21.3&quot;  +/-0.1&quot;<br/>
         FN20ps.77GU96 +/-<br/>
         V +5058  H +1504<br/>
<br/>
 &lt;<a rel="nofollow" target="_blank" href="http://home.earthlink.net/~rcmcc">http://home.earthlink.net/~rcmcc</a>&gt; <br/>
<br/>
I hear and I forget.<br/>
I see and I remember.<br/>
I do and I understand.<br/>
 - Chinese proverb</div>