Hi, We're still working on our extended elevation, and have been having problems getting the centreline to work with extend configuration commands. We have found a number of occasions where an "extend reverse stationname" command reverses one leg at that point but doesn't apply to any folloeing legs. e.g. in a passage going 5 -> 6 -> 7 -> 8 -> 9 -> 10 extend reverse 7 gives: 5 -> 6 -> <- 7 8 -> 9 -> 10 when I would expect: 5 -> 6 -> <- 7 10 <- 9 <- 8 We've ended up having to add explicit extend right configuration for station 7, then station 8 and station 9 etc. We've tried to pare down our survey to one example of this in the attached file (julagua-elev_testcase.th) There are also several other examples where this occurs commented out. Any chance of fixing this? Cheers, John & Hilary
And hi again As I have mentioned I have very little experience with extended elevations, but taking your example as an opportunity to learn... The following excerpt from the Therion book suggests you may have made an error in input. Perhaps if you specify only one station it will work as you desire? "normal/reverse . extend given and following stations to the same/reverse direction as previous station. If two stations are given, direction is applied only to given shot. Bruce -----Original Message----- From: therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of John Pybus Sent: Tuesday, 24 February 2009 12:45 p.m. To: Therion List Subject: [Therion] Problem using extend command Hi, We're still working on our extended elevation, and have been having problems getting the centreline to work with extend configuration commands. We have found a number of occasions where an "extend reverse stationname" command reverses one leg at that point but doesn't apply to any folloeing legs. e.g. in a passage going 5 -> 6 -> 7 -> 8 -> 9 -> 10 extend reverse 7 gives: 5 -> 6 -> <- 7 8 -> 9 -> 10 when I would expect: 5 -> 6 -> <- 7 10 <- 9 <- 8 We've ended up having to add explicit extend right configuration for station 7, then station 8 and station 9 etc. We've tried to pare down our survey to one example of this in the attached file (julagua-elev_testcase.th) There are also several other examples where this occurs commented out. Any chance of fixing this? Cheers, John & Hilary
Bruce Mutton wrote:
And hi again As I have mentioned I have very little experience with extended elevations, but taking your example as an opportunity to learn...
The following excerpt from the Therion book suggests you may have made an error in input. Perhaps if you specify only one station it will work as you desire?
"normal/reverse . extend given and following stations to the same/reverse direction as previous station. If two stations are given, direction is applied only to given shot.
Ah, that was not my understanding of how it works. My reading of that passage is saying that the directive applies only to the given shot at the 1st station (specified by the 2nd station) not that it then stops applying to further stations in that direction. It is useful at junctions where the one station version isn't specific enough. i.e. 1--2--3 | 4--5 extend reverse 2 would give: 1,3==2 | 5--4 (i.e. both 2->3 and 2->4 get affected) and extend reverse 2 4 would give: 1--2--3 | 5--4 (i.e. just 2->4 direction gets affected) That is how the equivalent function works in survex espec files, so how I expected the functionality in therion to work. I can't really see any use for the meaning Bruce describes, but the meaning I drew is frequently useful at junctions in the cave. I also think it's a bad idea for therion to have commands with the same syntax as survex but gratuitously different syntax. Perhaps it could be changed to match? [disclaimer: I did write the survex support for extend specifications, though that was many years ago] John
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Bruce Mutton -
John Pybus