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<DIV><FONT face=Arial size=2>The elevation accuracy of commercial GPS units is
horrible, I've seen them off by more than 100 feet and they are not reliable at
all for the requested usage in this instance. Surveyors use GPS units that
are accurate in both horizontal and vertical axis measurements but they use
radio frequency units to get down to accuracy levels within inches on
either. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>My suggestion is to contact a manufacturer of
surveying equipment and asking them for technical information on how their units
achieve high degrees of accuracy. But be advised, they are very
expensive.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Tom</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=peter.parrish@calsolareng.com
href="mailto:peter.parrish@calsolareng.com">Peter Parrish</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">'RE-wrenches'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, January 27, 2009 12:32
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] GPS
units</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face="Times New Roman" color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black">A caution to all. There are various
types of GPS units, with varying accuracies. The most accurate are spec’d at
around +/- 6 feet. I have a Garmin Etrex and under normal circumstances it
delivers at that spec or better (+/- 3 feet). Near tall buildings or in a
steep canyon, the accuracy goes to pot but for known reasons (multiple
reflections of the radio signals). I have no manufacturer’s info on elevation,
but knowing how GPS units work, the resolution/accuracy in elevation should be
roughly the same. </SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black">- Peter</SPAN></FONT></P>
<DIV>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Peter T. Parrish,
President<BR>California Solar Engineering, Inc.<BR>820 Cynthia Ave., Los
Angeles, CA 90065<BR>Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885<BR>CA Lic. 854779, NABCEP Cert.
031806-26<BR>peter.parrish@calsolareng.com</SPAN></FONT><FONT face=Arial
color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">
</SPAN></FONT></P></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Jason Lombard<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, January 27, 2009 2:02
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
RE-wrenches<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re:
[RE-wrenches] GPS units</SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">William,<BR><BR>Topographic maps are
great if your familiar with them. A laser if you can afford it or the best I
have heard of is fill a tube or pipe with water from the pump to your tank and
measure the psi at the base of it. The calculation is 2.31 feet of lift for
every psi. Not everyone has their piping rolled out or on site yet so this
could be a challenge and again is very accurate.<BR><BR>BTW - GPS units are
inaccurate to the extent that they are 40 feet off horizontally and 90 feet
vertically. This means you could be up to 130 feet off. Big difference when
your sizing for particular pump out put.<BR><BR>Good luck,</SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">On Tue, Jan 27, 2009 at 2:34 PM, William Miller <<A
href="mailto:wrmiller@charter.net">wrmiller@charter.net</A>>
wrote:</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">Does anyone have a foolproof tool to
measure elevation? I have researched GPS units recently. They are
notoriously inaccurate for elevation:<BR><BR><A
href="http://wiki.motionbased.com/mb/GPS_Unit_Elevation"
target=_blank>http://wiki.motionbased.com/mb/GPS_Unit_Elevation</A><BR><BR>Here
are few more links with GPS fundamentals:<BR><BR><A
href="http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html"
target=_blank>http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html</A><BR><A
href="http://www.gpsreview.net/electronic-compass/"
target=_blank>http://www.gpsreview.net/electronic-compass/</A><BR><BR>I have a
Suunto Observer watch with an altimeter. I think I can get relatively
accurate measurements of DIFFERENCE in elevation if I measure the two
elevations in quick succession. I will be trying
it.<BR><BR><BR><BR>William<BR><BR>_______________________________________________<BR>List
sponsored by Home Power magazine<BR><BR>List Address: <A
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target=_blank>RE-wrenches@lists.re-wrenches.org</A><BR><BR>Options &
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<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><BR><BR clear=all><BR>-- <BR>Jason Lombard<BR>Open
Hand Solar LLC.<BR>Certified Sustainable Building Adviser<BR><A
href="mailto:openhandsolar@gmail.com">openhandsolar@gmail.com</A><BR>505 795
8646<BR><BR>"I'd put my money on solar energy… I hope we don't have to wait
'til oil and coal run out before we tackle that."<BR><BR>—Thomas
Edison</SPAN></FONT></P></DIV>
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