I try to get people to rotate the distox when taking some/all readings depending on there keenness and how easy it is*. The distox records and sends its rotation to pockettopo and I put this into the therion/survex file. So should the rotated leg have a different sd to the none rotated, probably. It would be useful if therion/survex could do this automatically from the readings but I guess that would require there to be a rotation field in *data
*rotation is a partial check on calibration and generally picks up local magnetic interference, so at a minimum rotate every 5 or whenever we suspect metal. Andrew On Wed, 15 Aug 2018, 15:23 Footleg, <drfoot...@gmail.com> wrote: > In my own experience, the most common blunder which the 'measure 3 times' > method with DistoX2 catches is mis-read distance. The Disto tends to be > used in the same orientation for all 3 shots, so the compass and clino tend > to be well aligned in all 3 (regardless of how well calibrated the DistoX > is, or is there are local magnetic fields throwing the compass). But the > laser does sometimes miss the target and overshoot, resulting in one of the > 3 shots being out of tolerance for PocketTopo to count them as a valid leg. > Of course catching blunders so they never make it into the data (we would > reshoot when it happens) is not the same as the SD in the measured data. > > The way we catch bad calibration problems or local magnetic interference is > to take backshots (3 of them). This has saved serious errors on multiple > occasions which would not have been detected taking shots in one direction > alone. > > Footleg > -- > Survex https://lists.survex.com/mailman/listinfo/survex >
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