<div>Thanks for the clarification. <br></div><div class="gmail_extra">I admit to have missed the point, the test I made some time ago when starting using Therion were not enough accurate to show the vthreshold limit. </div>
<div class="gmail_extra"><br clear="all">Marco<br>
<br><br><div class="gmail_quote">On Thu, Nov 1, 2012 at 9:48 AM, Bruce <span dir="ltr"><<a href="mailto:bruce@tomo.co.nz" target="_blank">bruce@tomo.co.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>
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<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">…so to clarify further …<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">As the gradient of a survey shot
increases, therion switches from the assumption that passages are measured LRUD
(vertical up down) to an assumption that they are measured LR-front-back (up
down perpendicular to the passage orientation) and then at +-90 deg to the
assumption that they are measured NSEW.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">You can control the inclination at which
the first change occurs by adding<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"> vthreshold 40 degrees <u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">to your centerline block of data.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Unfortunately we cannot change the NSEW
behaviour (yet).<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">What you need to know of course, is approach
the surveyors took when they were collecting the data, and adjust your input
accordinly.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Bruce<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
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<div class="MsoNormal" align="center" style="text-align:center"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">
<hr size="2" width="100%" align="center">
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<p class="MsoNormal"><b><font face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma">
<a href="mailto:therion-bounces@speleo.sk" target="_blank">therion-bounces@speleo.sk</a> [mailto:<a href="mailto:therion-bounces@speleo.sk" target="_blank">therion-bounces@speleo.sk</a>] <b><span style="font-weight:bold">On Behalf Of </span></b>Bruce<br>
<b><span style="font-weight:bold">Sent:</span></b> Thursday, 1 November 2012
7:08 a.m.<br>
<b><span style="font-weight:bold">To:</span></b> '<u></u>List
for Therion users<u></u>'<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Therion] Doubt about
vertical sections</span></font><u></u><u></u></p>
</div><div class="im">
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Marco<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">I tested your example and got the result
you described with both xvi and pdf outputs.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">I think you have found the transition
defined by ‘vthreshold’.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">From the Therion Book…<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">“<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">vthreshold <number> <units> </span></font><font color="navy" face="Lucida Sans Unicode"><span style="font-size:10.0pt;font-family:"Lucida Sans Unicode";color:navy">◃</span></font><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"> threshold for interpreting LRUD readings as left-right-front-back
reading perpendicular to the shot.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">If passeges are horizontal (inclination
< vthreshold), LR is perpendicular to the shot and UD is vertical.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">If passages are more or less vertical
(inclination > vthreshold), even UD becomes perpendicular to the shot –
otherwise passages would not look very good. In the case of vertical shots, UD
is interpreted as north-south dimension from the station to allow tube-like
modelling of verticals<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">“<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">I had thought the default value of
vthreshold was 60 degrees, but it seems it may be around 67.5 degrees.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Bruce<u></u><u></u></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><u></u> <u></u></span></font></p>
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