I made one simple example file how errors in data are visualized: Sketch: .th file: survey error_visualization input nacrt.th2 centerline data normal from to tape compass clino ignoreall 1 2 11 45 -10 2 3 10.5 95 +10 no error #2 3 10.5 275 +10 backsight #2 3 1.05 95 +10 typo #2 3 10.5 65 +10 misreading 3 4 12 100 0 endcenterline endsurvey outputs without walls and with walls: On Feb 23, 2017, at 10:01 AM, Martin Sluka via Therion <therion@speleo.sk> wrote: 23. 2. 2017 v 3:08, Olly Betts via Therion <therion@speleo.sk>: I've done the armchair equivalent and used Aven's error colouring to successfully find mis-ties, reversed legs, etc. You will find them by drawing scraps in xtherion with "debug on“ option in thconfig immediately. Typos too - like 1.23/12.3 m length. Idea of scraps and maps is the most important part of Therion. m.s. _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion