<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi Torsten,</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">your data are correct - there was a bug in therion with calibration adjustments. It should be fixed in dd6835b.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Thanks a lot for finding out.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">S.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 30 Sept 2021 at 14:27, Torsten Schnitter <<a href="mailto:torsten.schnitter@netcologne.de">torsten.schnitter@netcologne.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
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Quantity List doesn't contain fromdepth or todepth. But only depth.
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Btw with "calibrate depth 0 -1" there is no error while compiling.
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Martin Sluka via Therion <<a href="mailto:therion@speleo.sk" target="_blank">therion@speleo.sk</a>> hat am 30.09.2021 14:08 geschrieben:
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</div>But you use fromdepth and todepth as quantity. Shouldn’t it be calibrate fromdepth todepth 4 -1 ?
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Martin S.
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30. 9. 2021 v 12:59, Torsten Schnitter <<a href="mailto:torsten.schnitter@netcologne.de" target="_blank">torsten.schnitter@netcologne.de</a>>:
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Due to the different waterlevel there is a difference of 4.0m in depth readings.<span> </span>
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To correct this I used "calibrate depth 4 -1" within the resurvey data.<span> </span>
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From Therionbook:
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calibrate <quantity list> <zero error> [<scale>] <span style="color:rgb(0,0,0)">. set the instrument calibration.</span>
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The measured value is calculated using the following formula: measured value =
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(read value - zero error) x scale. The supported quantities are the same as sd.
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From Survex manual:
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<p><span style="font-size:12pt;font-family:NimbusSanL;font-weight:bold">4.5.3. CALIBRATE </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Syntax<br>*calibrate <quantity list> <zero error> [<scale>] *calibrate <quantity list> <zero error> <units> [<scale>] *calibrate default </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Example </span></p>
<pre><span style="font-size:9pt;font-family:NimbusMonL;vertical-align:-2pt"> *</span><span style="font-size:9pt;font-family:NimbusMonL">calibrate tape +0.3
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<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Description </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">*calibrate is used to specify instrument calibrations, via a zero error and a scale factor. By default, the zero error is 0.0 and the scale factor 1.0 for all quantities. </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L"><quantity> is one of TAPE|COMPASS|CLINO|COUNTER|DEPTH|DECLINATION|X|Y|Z </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Several quantities can be given in <quantity list> - the specified calibration will be applied to each of them. </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">You need to be careful about the sign of the ZeroError. Survex follows the convention used with scientific instruments - the ZeroError is what the instrument reads when measuring a reading which should be zero. So for example, if your tape measure has the end missing, and you are using the 30cm mark to take all measurements from, then a zero distance would be measured as 30cm and you would correct this with: </span></p>
<pre><span style="font-size:9pt;font-family:NimbusMonL;vertical-align:-2pt"> *</span><span style="font-size:9pt;font-family:NimbusMonL">CALIBRATE tape +0.3
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<p><span style="font-size:10pt;font-family:NimbusRomNo9L">If you tape was too long, starting at -20cm (it does happen!) then you can correct it with: </span></p>
<pre><span style="font-size:9pt;font-family:NimbusMonL;vertical-align:-2pt"> *</span><span style="font-size:9pt;font-family:NimbusMonL">CALIBRATE tape -0.2
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<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Note: ZeroError is irrelevant for Topofil counters and depth gauges since pairs of readings are subtracted. </span></p>
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<p><span style="font-family:NimbusRomNo9L;font-size:10pt">In the first form in the synopsis above, the zero error is measured by the instrument itself (e.g. reading off the number where a truncated tape now ends) and any scale factor specified applies to it, like so:</span></p>
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<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Value = ( Reading - ZeroError ) * Scale (Scale defaults to 1.0) </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">In the second form above (supported since Survex 1.2.21), the zero error has been measured externally (e.g. measuring how much too long your tape is with a ruler) - the units of the zero error are explicitly specified and any scale factor isn’t applied to it: </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">Value = ( Reading * Scale ) - ZeroError (Scale defaults to 1.0) </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">If the scale factor is 1.0, then the two forms are equivalent, though they still allow you to differentiate between how the zero error has been determined. </span></p>
<p><span style="font-size:10pt;font-family:NimbusRomNo9L">With older Survex versions, you would specify the magnetic declination (difference between True North and Magnetic North) by using *calibrate declination to set an explicit value (with no scale factor allowed). Since Survex 1.2.22, it’s recommended to instead use the new *declination command instead - see the documentation of that command for more details. </span></p>
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