Subject: Re: mdvawv try advancing again too<br/>
Date: Aug 20, 2004 @ 00:40<br/>
Author: Ron McConnell (&quot;Ron McConnell&quot; &lt;rcmcc@...&gt;)<br/>
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<div id="ygrps-yiv-520412223">&quot;aletheiak&quot; says,<br/>
<br/>
&quot;what error range of gps readings are you able<br/>
to obtain in the field&quot;<br/>
I keep the error reading on.  The best I&#39;ve ever<br/>
seen is 7 feet.  Usually it&#39;s 10 to 15 feet<br/>
and sometimes more.<br/>
<br/>
&quot;...a retractable tape measure might be better...&quot;<br/>
Yep.<br/>
<br/>
&quot;...dont even have a gps receiver myself<br/>
& expect many members dont have a tape measure...&quot;<br/>
GPS receivers are getting cheaper.  I indulged myself.<br/>
I saw a nice rugged 25ft/7.5m tape at the car parts<br/>
store this morning for US$4.<br/>
<br/>
Hey, thanks for the VA-TN-NC info.<br/>
Getting close to home.<br/>
&quot;...kingsport in particular which seems<br/>
too far south to have been afflicted by the border...&quot;<br/>
Kinda looked like it to me, too.<br/>
I plan to trace across the zig in the line sometime<br/>
and see.   That was the local legend anyway.<br/>
<br/>
The first one that caught my attention lonnnng ago<br/>
was VA-TN-KY at Cumberland Gap.<br/>
Somewhere I have a note on the lat/long.<br/>
<br/>
I&#39;ll look into<br/>
   usgs publication<br/>
   boundaries of the united states & the several states<br/>
   by franklin k van zandt<br/>
<br/>
I have tweaked the input for decimal degrees<br/>
and minutes in GCB to allow more digits.<br/>
This will be hidden from the unitiated<br/>
with the input prompts remaining as<br/>
&quot;N/S dd.ddddd&quot; and &quot;N/S dd mm.mmmm&quot;<br/>
to not encourage folks to enter useless numbers.<br/>
Likewise on output the digits are rounded off<br/>
to hide the fact that several more are inside.<br/>
You just have to be careful typing and<br/>
remember what you enter.<br/>
I will upload the new version later tonight.<br/>
<br/>
Earlier today I was doing some research<br/>
on translating between NAD-27 (Clarke 1866)<br/>
and NAD-83 (essentially WGS84) latitude/longitude.<br/>
They warn that if one uses the wrong algorithm<br/>
one can get errors of several hundred feet.<br/>
The US Army Corps of Engineers CORPSCON<br/>
program which uses the US NGS NADCON algorithm<br/>
is one of the good programs.<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/>
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&quot;The first day or so, <br/>
we all pointed to our countries. <br/>
The third or fourth day, <br/>
we were pointing to our continents.  <br/>
By the fifth day, <br/>
we were only aware of one Earth.&quot;<br/>
<br/>
-Prince Sultan Bin Salmon Al-Saud, <br/>
    Saudi Arabian astronaut</div>