{% extends "base.html" %}
{% block title %}Expo survey statistics{% endblock %}

{% block content %}

<h1>Expo Survey Statistics</h1>

<p>{{ expoCount }} expeditions: {{ personCount }} people,  {{ caveCount }} caves, {{ walletsCount }} wallets and {{ logbookEntryCount }} logbook entries. 

<p>Number of survey legs: {{adduplegs}} <br />
Total length: {{adduplength}} km adding up the total for each year.</p>

<p>These lengths are not authoritative. 
<p>These are <em>uncorrected</em> tape lengths.They are uncorrected 
because they are lengths <em>before</em> any loop-closure corrections done by survex and because they <em>include duplicated surveys</em>. These numbers include pitches but exclude splays or surface-surveys.  <br />
Authoritative survey lengths for each cave, as explored by expo participants, are calculated using <a href="/handbook/troggle/cavelengths.html">a script</a> which 
<ol><li>uses the 
<em>loop-closure corrected</em> lengths 
<li>is manually curated to exclude duplicate surveys of the same cave.
</ol>

These authoritative results are maintained
in an <a href="/repositories/loser/.git/tree/docs/smklengths.ods">ODS-format spreadsheet</a>.
<p>

<!--
legsbyexpo: ((expedition, {"success":success, "people": expoers,  "tourists": tourists, "nsurvexlegs": legsyear, "survexleglength": survexleglength, "nblocks": nblocks}))
-->
<table>
<tr><th>Year</th><th>Survex<br>Survey<br>Blocks</th><th>Survex<br>Survey<br>Legs</th><th>Survex <br>length(m)</th><th>Cavers</th><th>Non-cavers</th><th>meters/caver</th></tr>
{% for legs in legsbyexpo %}
<tr>
  <td style="text-align:center"><a href="{{ legs.0.get_absolute_url }}">{{legs.0}}</a></td>
  <td style="text-align:center"><a href="/wallets/year/{{legs.0}}">{{legs.1.nblocks}}</a></td>
  <td style="text-align:center"><a href="/survexfilewild/{{legs.0}}">{{legs.1.nsurvexlegs|rjust:"10"|floatformat:"0g"}}</a></td>
  <td style="text-align:right">{% if legs.1.missing_length %}<span style="color:red">{% else %}<span>{% endif %}{{legs.1.survexleglength|floatformat:"0g"}}</span> </td>
  <td style="text-align:right">{{legs.1.people|floatformat:"0g"}}</td>
  <td style="text-align:center">{{legs.1.tourists|floatformat:"0g"}}</td>
  <td style="text-align:right">{{legs.1.success|floatformat:"1g"}}</td>
</tr>
{% endfor %}
</table>
<p>One Survex Survey Block is one *begin/*end block of data in a survex file. Different survex blocks in the same survex file can have different dates and surveyors.
<p>Both this table and the authoritative script exclude survex files where there is no expo participant listed as a surveyor.
<p>In the early years survex was not used and the survex files have been hand-edited from earlier survey formats. The survex files and lengths recorded need checking for the 1980s and 1990s.
<p>The number of cavers excludes those attending who were not caving. This is something of a distortion as non-cavers 
may still be doing useful expo-related work such as prospecting, ferrying gear and preparing food. 
Non-cavers also include the bier tent and Rover Richardson, see <a href="/folk/index.html">the folk list</a> for details.



{% endblock %}