On Tue, Sep 02, 2025 at 12:58:00PM +0100, Andrew Atkinson wrote:
For the data set
http://www.cave-registry.org.uk/svn/CheddarCatchment/LongwoodValleySink/ [Survex says:] 6> Total length of survey legs = 1004.00m (1003.23m adjusted) [Therion says:] length: 1030.92m (surface 0.00m, duplicated 109.15m) [...] 1030.92 to 1004.00
Does therion implement automatic averaging of consecutive repeated legs? For example, these three legs would be average to one leg and have a total length of just over 7m in Survex: 30 31 7.082 159.22 70.98 30 31 7.080 159.60 70.87 30 31 7.104 159.97 70.58 Maybe therion treats this as 3 legs with a total length of just over 21m? That's from TickleWest.th. The other case I found which isn't flagged as "duplicate" is also in that file: 33 34 6.525 350.23 82.85 # virtual stn 33 34 6.295 351.22 82.56 33 34 6.279 349.95 82.24 Just averaging the lengths, if my hypothesis is correct we'd expect to get a length about 26.91m longer with therion, which is only 1cm away from what you observed (which could just be from to subtracting two answers rounded to the nearest cm). Cheers, Olly