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294 lines
15 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Handbook - Starting a new Survex file</title>
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<link rel="stylesheet" type="text/css" href="/css/main2.css" />
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</head>
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<body>
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<h2 id="tophead">CUCC Expedition Handbook - New Survex file</h2>
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<h1>Creating a new survex file</h1>
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<h2>Great, I have discovered a new cave...</h2>
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<p>If you have not come to this page from the sequence starting at <a href="newcave.html">Starting a New Cave"</a> then go and read that first.
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<div style="width:100%;height:50px;background:#C8E1E2" align="center">
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This page outlines step 3 of the survey production process. Each step is documented separately.<br />
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<!-- Yes we need some proper context-marking here, breadcrumb trails or something.
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Maybe a colour scheme for just this sequence of pages
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-->
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<a href="newcave.html">1</a>
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- <a href="newwallet.html">2</a>
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- <a href="newsurvex.html">3</a>
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- <a href="drawup.htm">4</a>
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- <a href="newrig.html">5</a>
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- <a href="caveentry.html">6</a>
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- <a href="ententry.html">7</a>
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- <a href="cavedescription.html">8</a>
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</div>
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<h2>Process</h2>
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<p>You do not need any software to create a survex file. You can do it using the online editor in your web browser.
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So you do not need to have installed survex on your laptop at this point.
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</p>
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<p>Once you used the online system, which tries to give useful feedback, you can type up survex files using a text editor.
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<p>If using a digital survey device, initially cut and paste the surve data from an exported file into the online survex editor form.
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<div class="centre">
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<figure>
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<a href="/survexfile/caves-1623/204/midlevel/110_bidet.svx">
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<img src="notex.jpg" width="700px"></a>
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<figcaption style="font-variant-caps: small-caps;">
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<em>Typical raw survex data - 'bidet' in Steinbrückenhöhle, Martin Green 2000-08-14</em> <br />Click to see in online editor.
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</figcaption>
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</figure>
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</div>
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<h3>Fixing the location of the entrance</h3>
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<div class="onright">
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<figure>
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<a href="/walletedit/2023:17">
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<img src="fix-2023-js-02-notes.jpg" ></a>
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<figcaption style="font-variant-caps: small-caps;">
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<em>At cave sketch notes [July of course, not June]</em>
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</figcaption>
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</figure>
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</div>
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<ul>
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<li>We won't be able to see where your cave may link in to others <b>if we don't know where it is</b>.
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<li>We won't be absolutely sure that your cave is actually a new cave <b>unless we can check it off</b> the locations in our records.
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<li>If your cave does link to another, we need to know where the entrances are <b>with respect to each other</b> so that we can compute the loop-closure errors and improve the quality of the surveys.
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</ul>
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<p>So this is important.
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<div class="onright">
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<figure>
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<a href="/walletedit/2023:17">
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<img src="fix-2023-js-02-new.jpg" ></a>
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<figcaption style="font-variant-caps: small-caps;">
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<em>New Cave Sheet location and altitude</em>
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</figcaption>
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</figure>
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</div>
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<p>Now, in 2023, we have mobile phones which can get a GPS location directly from the satellites without requiring a 'mobile signal'. We find that relying on one of the party recording a continuous 'track', and then extracting the locations later, is very prone to human error. The worst and most common error is that everyone forgets to do this.
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<p>The (strongly) recommended procedure is to take a specific GPS measurement at a well-defined point and to write down the location on your prospecting survey notes. Then for a new discovery it will be copied onto the New Cave data sheet.
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<p>Note that we record the location in degrees and decimals of degrees: <code>47.69055 13.80841</code> and the altitude is in metres.
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<p>The altitude is almost useless: we get better altitudes by using the lat/long numbers together with a laser scan of the plateau topography. GPS altitudes will continue to be pretty bad, and even the new Galileo system won't promise anything better than ± 0.4m in 2030. (If you take the altitude from a track while moving the altitude can easily be 15m wrong.)
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<p>See <a href="#location">the bottom of this page</a> for how the location information is typed in.
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<h4 >Two ways to type in survex data</h3>
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<ul>
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<li>Use the online system using a web browser from any computer anywhere. You will need to
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be somewhat confident of the name (the 'surveytrip' id) you will be using, which will typically be the name of your new passage (e.g. "easybimble")
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and the number used for the cave: either an existing one such as 1623-290 or a completely new one such as 2050-BH-03.
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<li>Or you can create a new file with a text-editor on the <em>expo laptop</em>. Instructions are
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<a href="#survexformat">at the bottom of this page</a>.
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</ul>
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<h3><a id="onlinesvx">Using the direct online system</a></h3>
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<p>This is where you type up the hand-scrawled notes directly into a a web browser, creating a new online survex file automatically
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in the right place on the online system.
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<p>You will be over-writing a template file with lots of comments and optional examples in square brackets,
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but first you need to find the right place for everything.
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<h4 id="rightplace">The right place</h4>
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<p>Having confirmed the right name to use for your passage and your cave, including whether it is in area 1623 or 1626,
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the survex file will eventaully be in e.g.
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<pre>
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caves-1623/2050-BH-03/easybimble.svx
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</pre>
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The way to start is to open a web browser on the equivalent page
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<pre>
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http://expo.survex.com/survexfile/caves-{area}/{cave}/{surveytripid}.svx
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</pre>
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where {area} will be 1623 or 1626, and for a new discovery, {cave} will be something like 2050-BH-03 if it is the third cave disovered by
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Dr. Bunsen Honeydew on the 2050 expo, e.g.
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<pre>
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<a href="/survexfile/caves-1623/2050-BH-03/easybimble.svx">/survexfile/caves-1623/2050-BH-03/easybimble.svx</a>
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</pre>
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<em>Before</em> you click on that link, you need to make sure that you are logged in. In the top-right of troggle-generated pages there is a menu item "Log in", if
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all your browser pages are handbook pages, click <a href="/accounts/login/">here</a> to get to the log in page. The username is "expo" and the password
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is the usual cavey:beery one which is written up on the whiteboard in the potato hut.
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<p>
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Now click that link <a href="/survexfile/caves-1623/2050-BH-03/easybimble.svx">/survexfile/caves-1623/2050-BH-03/easybimble.svx</a> and a survex-file editing page will open, pre-populated with an example template
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for survex data.
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<p>Overwrite the name of the survex file "-1623/2050-BH-03/easybimble.svx" with the right data for your cave and <em>press return again</em> to make sure that the browser 'knows' that it is working on your survex file and not the mythical one in 2050.
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<p>Most of the template data you will delete and replace. Edit this template and type in your own data. OK, so if you have never typed
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a survex file before, go to <a href="#newbie">this section</a> below on this page.
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<p>If you have several parts of the cave surveyed on one trip, create several distinct .svx files.
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<p>You can save your work by pressing the "Save this edited svx file" button <em>below</em> the edit box, but it
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will refuse to save until you have hand-edited out all the template material in [square brackets].
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<p>As you edit it, you can
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press the "Differences between edited and saved versions of this file" and the differences which
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comprise your recent typing will be listed below the edit window.
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<p>Before you finish typing, use the third button "Run 'cavern' on this file".
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<br>
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- If you haven't yet removed all the [square brackets] stuff, nothing will happen except a message
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<pre> SAVE FILE FIRST</pre>
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below the edit window.
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<br>
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- If you try to save before editing out the [square brackets] stuff then you will get a message
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<pre>Error: remove all []s from the text.
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Everything inside [] are only template guidance.
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All [] must be edited out and replaced with real data before you can save this file.
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</pre> below the editing window.
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<br>
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- But if you have done all that, then survex will process your new survex file and tell you interesting things about
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your survey data below the editing window. ('<a href="https://survex.com/docs/manual/cavern.htm">cavern</a>' is the
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survex engine which we use to process survex files.)
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<p style="margin:4%">
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<em>Technical Note:</em> When the survex file is saved, it is being saved to the permanent store on the expo file
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server. It is also being automatically registered in the version control system. So don't worry about losing data. A super-git-nerd can always recover it (not a job for an ordinary nerd though).
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<h4>Understanding the messages</h4>
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<p>You may see a number of error messages below the editing window: <em>read them and understand them</em>. If you
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don't understand them, <em>ask someone</em>.
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<p>So using the online system gives you a very, very easy way of syntax-checking your data entry and
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typing up your notes.
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<p>The output you get from 'cavern' will look like this (yes this really does take less than 0.01s):
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<pre>
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LOGMESSAGES
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Survey contains 21 survey stations, joined by 23 legs.
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There are 3 loops.
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Total length of survey legs = 305.80m ( 305.79m adjusted)
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Total plan length of survey legs = 253.09m
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Total vertical length of survey legs = 125.24m
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Vertical range = 44.74m (from galactica.1 at 0.35m to galactica.20 at -44.39m)
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North-South range = 99.31m (from galactica.19 at 28.14m to galactica.12 at -71.17m)
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East-West range = 53.27m (from galactica.1 at 1.12m to galactica.9 at -52.15m)
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3 1-nodes.
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13 2-nodes.
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3 3-nodes.
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2 4-nodes.
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CPU time used 0.00s
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</pre>
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<h4>Folders and subfolders</h4>
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<p>If you have a complex cave like 204 or 161 with many separate exploration zones then you can put subfolder names in the
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URL bar e.g.
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<pre>
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<a href="/survexfile/caves-1623/2050-BH-03/murderalley/killerclimb/easybimble.svx">survexfile/caves-1623/2050-BH-03/murderalley/killerclimb/easybimble.svx</a>
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</pre>
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and the intermediate directories will be created on the server if they don't already exist. This is in addition to
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the directory name which is also the name of your new cave being created automatically.
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<h3 id="survexformat">Typing in the survey data with a text editor</h3>
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<p>The survey data typed up must include all the notes, including station details and passage
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names. A simple copy of the export from a digital device will not do. We need names, dates and description. Make a backup copy to another machine or USB stick as soon as you have typed it in.
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<p>
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New users will be using the online form to create the .svx file , not by editing a text file with a text editor,
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so don't confuse newcomers by showing them how you (an expert, of course) do it.
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<p>
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The new survex data will live in the folder on the <em>expo laptop</em>:
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<pre>
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/home/expo/loser/caves-{area}/{cave}/{surveytripid}.svx
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</pre>
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example:
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<pre>
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/home/expo/loser/caves-1623/264/mongolrally.svx
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</pre>
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and tell someone nerdy when you have finished and they will
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ensure that it is <em>saved, committed, </em>and<em> pushed</em> appropriately to the :loser: repo. All of which is automatic if you
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use the online form.
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<h3 id="newbie">What goes in a survex file</h3>
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<ul>
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<li><a href="/expofiles/documents/surveying/survex-guide.pdf">How to create a survex file</a> - PDF - Brendan's guide.
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<li><a href="getin.htm">From muddy book to survex plot</a> - the survex file format (to be revised)
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<li><a href="qmentry.html">How to add QM data and cave descriptions</a> - and why this is vital
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<li><font color=red>[survex software docm.]</font> <a href="https://survex.com/docs/manual/svxhowto.htm">Contents of .svx files</a> - How do I?
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<li><font color=red>[survex software docm.]</font> <a href="https://survex.com/docs/manual/genhowto.htm">How do I Create a new survey</a> - example with several surveys joined
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<li><font color=red>[survex software docm.]</font> <a href="https://survex.com/docs/manual/datafile.htm">Survex data files</a> - all the sections and keywords explained
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<li><font color=red>[tunnel software docm.]</font> <a href="/expofiles/tunnelwiki/wiki/pages/File_Formats.html">Survex data files</a> - introduction and explanation
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</ul>
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<p>Once you have created the .svx file you will run survex to check that your format is correct without typos
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and to generate a centre line. Then you will print the survey line,
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manually transcribe your sketches from the wallet notes onto that paper,
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scan it again and then use that scanned image to digitise passage layout into tunnel or therion.
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<ul>
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<li><a href="athome.htm">Back in the UK</a> - not really part of the process
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<li><a href="/expofiles/presentations/cave_surveying_20130626.pdf">Cave Surveying - training course slidepack</a>
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<li><a href="../survexhistory96.htm">History of Survex (1996)</a></li>
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</ul>
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<p>[Nerds: survex cave data belongs in the <a href="../computing/repos.html">repository</a> :loser: so e.g.
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:loser:/caves-1623/264/mongolrally.svx". We are assuming that normal users have never
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worked with an distributed version control system at this point which is why we are
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telling them to use the online form.]
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<h3><a id="tickqm">Entering the QM data</a></h3>
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<p>
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QMs are the unexplored leads, they are Question Marks because we don't
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know where they go to. There is a specific format for recording them in survex files.
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</p>
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<p>
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Read this <a href="qmentry.html">separate description</a> about
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entering the QM data into a survex file.
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</p>
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<h3><a id="location">Entering the Entrance location data</a></h3>
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<p>The location of the cave is, eventually, stored in a survex file, just <em>not the same survex file</em>.
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<p><b>If you are doing this for the first time</b>, don't bother with this *fix stuff. Just type the latitude & logitude numbers into the <a href="ententry.html">New Entrance form</a> and someone else will do the *fix stuff.
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<h3><a id="tickingoff">Entering the cave description in the survex file</a></h3>
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<p>The last part of the survex file is a description of the passage surveyed. Remember
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that this is intended to be read by people
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<em>who have not been to that bit of the cave themselves</em>
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<code>
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;------------<br />
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;Cave description ;(leave commented-out)<br />
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; See 2017 description for details of GSH up to the 'p50'.
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Briefly, on the way to couldashouldawoulda a 22 m entrance crawl from the
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surface leads to a climb down and a junction. Left leads to easy c
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rawling passage for a short distance, then another junction where
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traversing over a shallow hole and down a stooping-height sandy
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passage to a sharp left turn and a sandy, easy 'squeeze' leading to a
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straighforward p10.
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</code>
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[from <a href="/survexfile/caves-1623/2017-cucc-24/couldashouldawoulda_to_bathdodgersbypass.svx"><em>couldashouldawoulda_to_bathdodgersbypass.svx</em></a>]
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</p>
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<p>
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Note that the description is often written as one long line. Use the word-wrap capability in your editor
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to make it easier for yourself.
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See more detail in the <a href="cavedescription.html">Cave Description"</a> handbook page which also describes eventual HTML publication.
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<div >
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<figure>
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<a href="../i/wolfhohle_1983-08-08.jpg">
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<img src="../t/wolfhohle_1983-08-08.jpg" ></a>
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<figcaption style="font-variant-caps: small-caps;">
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Wolfhöhle raw survey data 1983 - Austrian mud (click to enlarge)
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</figcaption>
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</figure>
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</div>
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<hr />
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<p>Back to the previous page in this sequence
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<a href="newwallet.html">Creating a new survey wallet</a>.
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<br />Now go the the next page in this sequence <a href="drawup.htm">Drawing up your survey</a>.
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<hr /></body>
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</html>
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