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add Patrick's knowledge and href - online edit of handbook/survey/lasers.htm

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handbook/survey/lasers.htm
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@ -6,7 +6,6 @@
<link rel="stylesheet" type="text/css" href="../../css/main2.css" />
</head>
<body>
<h2 id="tophead">CUCC Expo Surveying Handbook</h2>
<h1>Geographical fixed points on Loser</h1>
<style>figure {font-weight: bold; font-size: small; font-family: sans-serif;font-variant-caps: small-caps;}</style>
@ -20,6 +19,26 @@ These days the Austrians use WGS84 GPS like eveyone else.
<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>.
<p>From Patrick Warren (<a href="https://github.com/patrickbwarren/qgis3-survex-import">qgis3-survex-import</a>):<br />
"Many of the cave entrances are
recorded using a truncated form of the MGI / Gauss-Krüger (GK) Central Austria
CRS (the non-truncated form is
<a href="https://spatialreference.org/ref/epsg/mgi-austria-gk-central/" rel="nofollow">EPSG:31255</a>).
This truncated CRS corresponds to a proj4 string</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="+proj=tmerc +lat_0=0 +lon_0=13d20 +k=1
+x_0=0 +y_0=-5200000 +ellps=bessel
+towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m +no_defs"><pre class="notranslate"><code>+proj=tmerc +lat_0=0 +lon_0=13d20 +k=1
+x_0=0 +y_0=-5200000 +ellps=bessel
+towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m +no_defs
</code></pre></div>
<p dir="auto">(...this should be all on one line).
This is derived from the proj4 string for
<a href="https://spatialreference.org/ref/epsg/mgi-austria-gk-central/" rel="nofollow">EPSG:31255</a>
by changing the <code>+y_0</code> entry.</p>
<p dir="auto">For more details and examples of survex <code>*cs</code> commands see
<a href="/patrickbwarren/qgis3-survex-import/blob/master/cave_surveying_and_gis.pdf">cave_surveying_and_gis.pdf</a> in the present
repository."</p>
<h3>Original description - Historical record</h3>
<p>The coordinate system used by the Austrian Kataster is called the
@ -128,6 +147,5 @@ over a large enough area, as already indicated by GPS work...</p>
<br><br><figcaption>Austrian Meridians<a href="https://hoehle.org/downloads/SD_10_Handbuch.pdf">SD 10 Handbook</a> 8.7 - click to enlarge</figcaption>
</figure>
</div>
<hr>
</body>
<hr></body>
</html>