<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">But you use fromdepth and todepth as quantity. Shouldn’t it be calibrate fromdepth todepth 4 -1 ?<div class=""><br class=""></div><div class="">Martin S.<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">30. 9. 2021 v 12:59, Torsten Schnitter <<a href="mailto:torsten.schnitter@netcologne.de" class="">torsten.schnitter@netcologne.de</a>>:</div><br class="Apple-interchange-newline"><div class=""><div class="default-style" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Due to the different waterlevel there is a difference of 4.0m in depth readings.<span class="Apple-converted-space"> </span><br class=""></div><div class="default-style" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">To correct this I used "calibrate depth 4 -1" within the resurvey data.<span class="Apple-converted-space"> </span></div></div></blockquote></div><br class=""><div class=""><div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">From Therionbook:</div><div style="margin: 0px; font-stretch: normal; line-height: normal; color: rgb(4, 51, 255);" class=""><br class=""></div><div style="margin: 0px; font-stretch: normal; line-height: normal; color: rgb(4, 51, 255);" class="">calibrate <quantity list> <zero error> [<scale>] <span style="color: #000000" class="">. set the instrument calibration.</span></div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">The measured value is calculated using the following formula: measured value =</div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">(read value - zero error) x scale. The supported quantities are the same as sd.</div></div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><br class=""></div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">From Survex manual:</div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><br class=""></div><div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">
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<div class="column"><p class=""><span style="font-size: 12.000000pt; font-family: 'NimbusSanL'; font-weight: 700" class="">4.5.3. CALIBRATE
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Syntax<br class="">
*calibrate <quantity list> <zero error> [<scale>]
*calibrate <quantity list> <zero error> <units> [<scale>]
*calibrate default
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Example
</span></p>
<pre class=""><span style="font-size: 9.000000pt; font-family: 'NimbusMonL'; vertical-align: -2.000000pt" class=""> *</span><span style="font-size: 9.000000pt; font-family: 'NimbusMonL'" class="">calibrate tape +0.3
</span></pre><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Description
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">*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 class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class=""><quantity> is one of TAPE|COMPASS|CLINO|COUNTER|DEPTH|DECLINATION|X|Y|Z
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Several quantities can be given in <quantity list> - the specified calibration will be applied to each
of them.
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">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 class=""><span style="font-size: 9.000000pt; font-family: 'NimbusMonL'; vertical-align: -2.000000pt" class=""> *</span><span style="font-size: 9.000000pt; font-family: 'NimbusMonL'" class="">CALIBRATE tape +0.3
</span></pre><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">If you tape was too long, starting at -20cm (it does happen!) then you can correct it with:
</span></p>
<pre class=""><span style="font-size: 9.000000pt; font-family: 'NimbusMonL'; vertical-align: -2.000000pt" class=""> *</span><span style="font-size: 9.000000pt; font-family: 'NimbusMonL'" class="">CALIBRATE tape -0.2
</span></pre><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Note: ZeroError is irrelevant for Topofil counters and depth gauges since pairs of readings are
subtracted.
</span></p>
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<div class="column"><p class=""><span style="font-family: NimbusRomNo9L; font-size: 10pt;" class="">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></div></div></div><div class="page" title="Page 20"><div class="layoutArea"><div class="column"><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Value = ( Reading - ZeroError ) * Scale (Scale defaults to 1.0)
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">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 class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">Value = ( Reading * Scale ) - ZeroError (Scale defaults to 1.0)
</span></p><p class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">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 class=""><span style="font-size: 10.000000pt; font-family: 'NimbusRomNo9L'" class="">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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