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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Not sure if this is a Survex Aven issue or an issue with the way Therion parses data to a *.3d file, or indeed whether it is because I’m using an old version of Aven.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I was surveying fore-sight back-sight pairs, first time in a cave for ages... so initially made a naïve oversight:<o:p></o:p></p><p class=MsoNormal>- forgot to make the backsight legs duplicate, thereby almost doubling the calculated cave length.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In the entrance area of this (tourist) cave there is a big steel gate and overhead 240 v power wires some 15 – 20 m away. This led to 10-15 deg errors when outside the cave or some 4 m inside of the gate. We abandoned any hope of a compass survey outside the cave. Interestingly the powered-down cables in the cave seemed to have minimal if any effect on bearings. So I was using Aven to visually characterise the degree of misclosure on each fore-sight back-sight pair. ie Colour by error gave me nice dark blue 1x sd errors inside and lighter blue 3x sd errors near the entrance and outside.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So far, so good.<o:p></o:p></p><p class=MsoNormal>Then I realised that I needed to make the back-sight legs duplicate.<o:p></o:p></p><p class=MsoNormal>But now Aven does not display the duplicate legs as being part of a loop, so I lose the very useful ability to quickly visualise all of the loops and their relative quality.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In hindsight I have noticed that Aven misses plotting of loop closure sd of isolated legs for years, and I could not figure out why. I wonder if that is also related to a flags issue?<o:p></o:p></p><p class=MsoNormal>And wondering if this is considered a bug? ie display of loop status by Aven should override Therion flags status (duplicate, approximate, surface etc)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>therion 6.1.8 (2023-06-14)<o:p></o:p></p><p class=MsoNormal>Survex 1.4.1 > I’m using this cos the next version broke display of colour by error for Therion exported 3d files (I forget the reason now – maybe it’s been fixed since…)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards<o:p></o:p></p><p class=MsoNormal>Bruec<o:p></o:p></p></div></body></html>