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simple instructions for mobile phones added - online edit of handbook/survey/coord2.html

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Philip Sargent 2023-08-02 07:39:05 +01:00
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handbook/survey/coord2.html
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@ -4,7 +4,6 @@
<link rel="stylesheet" type="text/css" href="../../css/main2.css" />
</head>
<body>
<h2 id="tophead">CUCC Expo Surveying Handbook</h2>
<h1>GPS and coordinate systems</h1>
<style>figure {font-weight: bold; font-size: small; font-family: sans-serif;font-variant-caps: small-caps;}</style>
@ -13,8 +12,23 @@
<a href="lasers.htm">Geographical fixed points on Loser</a><br>
<a href="coord.htm">Basic Coordinate Systems</a>.<br>
<a href="https://hoehle.org/downloads/SD_10_Handbuch.pdf">SD 10 Handbook: Vergleich der &Ouml;K 50 mit der neuen &Ouml;K 50-UTM</a>.
<h3 id="summary">Summary - for 2023</h3>
<p>Surveying in Austria does <em>not</em> use the latitude and longitude you may be familiar with from Google maps, your phone etc.
<p>All our caves and locations in our survex files use the <a href="https://hoehle.org/downloads/SD_10_Handbuch.pdf">Austrian Caving national grid system</a>, numbers which look like this:
<table class="trad">
<tr><th> Northing</th><th> Easting</th><th> Altitude</th><th>
Description</th></tr>
<tr><td>411563.49 </td><td>5282622.35</td><td> 1867.95m </td><td>
p204a at the Stone Bridge</td></tr>
</table>
<p>These grid references are what we use to locate the entrances and to tie in the survey of a new cave in with the rest of the 180+ km of cave and surface surveys.
<p>Note that there are 6 digits starting 41... and 7 digits starting 52... This is not a mistake.
<p>However, when you prospecting and discover a new cave, you possibly only have the WGS84 latitude and logitude from your phone, e.g. <var>47.690933 N 13.821467 E</var> (degrees and decimals of degrees, set your phone to produce this: none of that degrees/minutes/seconds stuff, but if that's all that you have, we can work with that).
<p>So when you are recording the position of a completely new entrance, before you do any surveying, it will be the WGS84 lat/long that you will be writing down on the survey notes, and which will get scanned into the wallet back at base, and which you will enter into the <a href="/handbook/survey/caveentry.html">New Cave and Entrance forms</a> on troggle (step 6 of the dave data processing guide) in the lat/long. data entry fields.
<h3>Coordinate systems</h3>
<p>[The text from this point onwards is from before we had mobile phones, but it is correct.]
<p>It doesn't especially matter what display options are selected when you
are getting the GPS fix, but it is important to use standard ones when writing
@ -120,39 +134,5 @@ whether your GPS is set up right by just GPSsing a known point and comparing
the results. However, the main point of having a GPS fix on an entrance is
so we can find it again and be sure it is the same one!</p>
<hr />
<ul id="links">
<li><b>Expedition Handbook:</b>
<ul>
<li>Expo Handbook <a href="../index.htm">Introduction</a></li>
<li><b>Surveying:</b>
<ul>
<li>Surveying <a href="index.htm">Overview</a> and index of
topics</li>
<li><a href="what.htm">What is a cave survey?</a></li>
<li><a href="why.htm">Why am I doing this?</a></li>
<li>Methods: <a href="how.htm">underground</a></li>
<li>Pitfalls to avoid, <a href="hints.htm">hints'n'tips</a> to
make life easier</li>
<li>Methods: <a href="ontop.htm">surface</a></li>
<li>Base Camp: <a href="getin.htm">getting it in</a> to the
computer</li>
<li>Base Camp: <a href="drawup.htm">drawing it up</a>, writing
the description</li>
</ul></li>
<li><a href="../look4.htm">Prospecting guide</a></li>
<li><a href="../rescue.htm">Rescue guide</a></li>
<li><a href="../rig/rigit.html">Rigging guide</a></li>
<li><a href="../photo.htm">Photography guide</a></li>
</ul></li>
<li><a href="../../infodx.htm">Index to info/topics pages</a></li>
<li><a href="../../indxal.htm">Full Index to area 1623</a>
<ul>
<li><a href="../../areas.htm">Area/subarea descriptions</a></li>
</ul></li>
<li><a href="../../index.htm">Back to Expedition Intro page</a></li>
<li><a href="../../../index.htm">Back to CUCC Home page</a></li>
</ul>
</body>
<hr /></body>
</html>