sounds perfect -- but what's the copyright -- technically the entire survey would be a derivitive work.<br><br>JR<br><br><div class="gmail_quote">On 22 June 2010 22:14, Barnett, Phillip <span dir="ltr"><<a href="mailto:PHILLIP.BARNETT@itn.co.uk">PHILLIP.BARNETT@itn.co.uk</a>></span> wrote:<br>
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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Surely you need trig points? <a href="http://www.trigpointinguk.com/info/trigpoints.php" target="_blank">http://www.trigpointinguk.com/info/trigpoints.php</a>
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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">They’ll only get you accuracy to a
few centimetres though, not millimetres.</span></font></p>
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<div><font size="1" color="#006699" face="Arial"><b>PHILLIP BARNETT<br></b></font><font size="1" color="#006699" face="Arial"><b>SERVER MANAGER<br></b></font><font size="1" face="Arial"><br>200 GRAY'S INN ROAD<br></font><font size="1" face="Arial">LONDON<br>
</font><font size="1" face="Arial">WC1X 8XZ<br></font><font size="1" face="Arial">UNITED KINGDOM<br>T +44 (0)20 7430 4474<br></font><font size="1" face="Arial">F <br></font><font size="1" face="Arial">E <a href="mailto:PHILLIP.BARNETT@ITN.CO.UK" target="_blank">PHILLIP.BARNETT@ITN.CO.UK</a><br>
</font><font size="1"><font face="Arial"><font color="black"><a href="http://WWW.ITN.CO.UK" target="_blank">WWW.ITN.CO.UK</a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><br></font></font></font></div><font size="1"><font color="black"><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a></font><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><font face="Arial"><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a></a><font face="Arial"><span style="font-size: 18pt; color: rgb(0, 125, 0); font-family: Webdings;">P</span><font size="1" color="#007d00" face="Arial"><span style="font-size: 8pt; color: rgb(0, 125, 0); font-family: Arial;"> <font size="1"> Please consider the environment. Do you really need to print this email?</font></span></font></font><br>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;" lang="EN-US">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;" lang="EN-US">
<a href="mailto:talk-gb-bounces@openstreetmap.org" target="_blank">talk-gb-bounces@openstreetmap.org</a> [mailto:<a href="mailto:talk-gb-bounces@openstreetmap.org" target="_blank">talk-gb-bounces@openstreetmap.org</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>John Robert Peterson<br>
<b><span style="font-weight: bold;">Sent:</span></b> 22 June 2010 21:33<br>
<b><span style="font-weight: bold;">To:</span></b> talk-gb OSM List (E-mail)<br>
<b><span style="font-weight: bold;">Subject:</span></b> [Talk-GB] Reference
points for total station</span></font><span lang="EN-US"></span></p>
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<p class="MsoNormal" style="margin-bottom: 12pt;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">I have managed to gain
access to a total station (<a href="http://en.wikipedia.org/wiki/Total_station" target="_blank">http://en.wikipedia.org/wiki/Total_station</a>)
for doing a survey of a built up university campus. The goals of the project
are 2 fold:<br>
<br>
1) learn some new skills<br>
2) get some decent data for OSM of the area.<br>
<br>
Now for anyone that doesn't know about these things, they measure angles
horizontally with a very precise optical system, and use an IR range finder
beam to locate a reflector prism to within millimeters. It's range is into the
hundreds of meters. It has a sophisticated processing unit in it that can do
some helpful maths and data storage for you. The prism is on top of a stick of
measured length, with a spirit level built in, and is carried and placed by an
assistant known as a "stick monkey".<br>
<br>
It's well known to that that actually know what they are talking about in these
circles, that positioning the stick is actually the talented part of the
operation and that repeatedly pressing the green button on the box is actually
less intellectually demanding.<br>
<br>
There is also a "reflectorless" version that I may be able to gain
access to later, but that's not guaranteed. This uses lasers, and requires no
"stick monkey" and associated gibbons. The plan is to use this for
heights of buildings only.<br>
<br>
The device provides accurate 3d positions with the following caveat: it has no
idea where it is, or where it's pointing until it gets reference data, this can
be done in the following ways:<br>
<br>
It knows where down is via gravity;<br>
<br>
If you give it a number of calibrated reference points, it can work out where
it is and where it's pointing, error control is built into this, so it needs at
least 3, preferably 5 points, one of the points needs to have proper altitude;<br>
<br>
If you once get it calibrated, you can generate more calibrated reference
points, meaning that you can daisy chain it off itsself;<br>
<br>
Since this is a learning process into surveying, we want to actually do it to
an accuracy of a few millimeters.<br>
<br>
So the question is -- where do we get the first points from? There is one very
old and well known building right in the middle of the area, and there are a
number of land marks around, these may be usable, but how do I know their
positions?<br>
<br>
There are also a number of distant landmarks in the area, but most would be too
far away to use effectively, I dont' think the machine has the ability to take
points only as distant points with no distance, though I do have access to the
raw data, and would happily do the maths myself.<br>
<br>
Thanks,<br>
JR<br>
<br>
<br>
<br>
</span></font></p>
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