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Hi Xavier, Hi Bruce, <br>
<br>
A trick that I used a while ago was to use the grid-origin command
in the layout. According to Marco corvi's description
(<a class="moz-txt-link-freetext" href="http://marcocorvi.altervista.org/caving/tbe/m_02/m_02a.htm">http://marcocorvi.altervista.org/caving/tbe/m_02/m_02a.htm</a>): <i>grid-origin</i><i>
specifies the coordinates of the grid origin. Example:
"grid-origin 0 0 1875 m", assuming that the entrance altitude is
1875 m, sets the altitude values for the </i><i><code>altitude</code></i><i>
points. Having set the entrance (grid origin) altitude, when you
specify an "altitude" for a point of a wall line (with the
line-point option "altitude .") the value of the altitude is
computed and printed on the map. </i><br>
<br>
The difficulty is that all the layouts need to have the same
grid-origin if you want to have compatible depth in different
exported maps.<br>
<br>
Hope that helps.<br>
<br>
Xavier<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Le 21-Feb-19 à 20:33, Bruce Mutton via
Therion a écrit :<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal">Kia Ora Xavier<o:p></o:p></p>
<p class="MsoNormal">I don’t have a proper answer for you. It
would seem to me that this is too complicated to become a
built in feature. As you suggest, for an export of one cave
the problem might be easier to solve, but where many caves are
exported it might be difficult to conceive an automated
approach.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Maybe an easier thing to code would be
something where the user could just choose a reference
altitude to use as a notional zero altitude for your user
defined metapost? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Personally I do not care much for the
height relative to entrances, and I have modified the header
to report height like this.<o:p></o:p></p>
<p class="MsoNormal"><img style="width:5.1354in;height:.2812in"
id="Picture_x0020_1"
src="cid:part1.EF5B01E3.B8D3DA4F@inria.fr" class=""
width="493" height="27"><o:p></o:p></p>
<p class="MsoNormal">Together with gridlines and altitude points
throughout the map, the user of the map can do their own
maths!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regarding ‘caves’ and ‘main entrances’, I
explored some ideas in the wiki <a
href="https://therion.speleo.sk/wiki/faq?s%5b%5d=entrance#how_do_i_specify_a_main_entrance_and_also_the_other_entrances"
moz-do-not-send="true">here</a> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards<o:p></o:p></p>
<p class="MsoNormal">Bruce<o:p></o:p></p>
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<br>
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<pre class="moz-signature" cols="72">--
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
> 2004 Route des Lucioles, BP93
> F-06902 Sophia-Antipolis Cedex, France
> +33 4 92 38 76 64
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> -------------------------------
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