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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Footleg<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>When I first figured out how to draw
projected elevations my (somewhat erroneous) assumption was that I could use extended
elevation drawings to create projected elevations in almost any direction.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What I found was, yes, of course you can,
but the further the particular piece of passage deviates from perpendicular to
the direction of projection, the more the distortion. So, in all but the
straightest of caves you won’t like the result. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Having said that in one of our current
projects I still have a scrap drawing (a few years old) that is identical in
the extended elevation and the projected elevation. It is only a little
warped in the projection. However I cheated. First I drew the
extended elevation, then I copied the file and manually changed the projection
in one of them. So even this is not <u>really</u> a case of the same scrap
being used in two projections.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The process I use when drawing projected
elevations is (whether booking on paper or going wireless with pda);<o:p></o:p></span></font></p>
<ol style='margin-top:0cm' start=1 type=1>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>draw
the plan view,<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>use
therion to plot the projected elevation centerline on paper,<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Looking
at the plan, (and my paperless pockettopo extended elevation sketch if I have
one)<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>draw
the elevation over the centerline on paper, conceptualizing it into scraps
as I go, <o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo1'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>scan
the drawings and then import them into therion and trace over them.<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>A bit frustratingly manual compared to the
paperless process for plan views, but simple and effective enough.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bruce<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Footleg<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, 23 March 2011
11:23 a.m.<br>
<b><span style='font-weight:bold'>To:</span></b> List for Therion users<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Therion] How to
generate a projected elevation alongaspecificbearing?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Now that I have played
with this a bit more, I see that I get an error unless every scrap, map and map
export projection declaration using those scraps has exactly the same
projection bearing. I had thought it might be possible to generate a projected
elevation map along a different bearing from that which the scraps were drawn
on, but possibly not? Is it possible to generate projected elevations using
extended elevation scraps? I am just trying to explore the options for
producing projected elevation output from my source data so I can better
understand how to draw up my initial elevation scale sketches on paper before
trying to therionise them.<br>
<br>
<br>
<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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