- If the "data" command contains "backcompass" and/or "backclino" and the user did not actually take a backsight for some shots, can I put 0.00 or do I have to fake backsights to prevent bad averaging? Or is there a way to tell Therion to ignore this missing data (other than repeating a "data" command), like putting a ? or some special character?
You should be able to use -, if backcompass reading is missing.
- Can I interleave station flags between survey shots, like:
3.1 3.2 10.00 359.99 -10.00
station 3.1 "" entrance
3.2 3.3 11.00 1.00 -12.00
This should be possible.
- For splay shots (between a station and some detail, where one station is . or -), do I have to put LRUD data? It's always going to be 0.00.
You may use -, if LRUD data are missing. For splay shots, they are simply ignored.
- If I want to pass topofil data, can I pass both start and end readings? How? The Therion book only mentions "topofil".
You can use fromcount/tocount for start and end readings: data topofil from to compass clino fromcount tocount
- How do I tell Therion that slope 0 is up or down? Such 0-180 clinometers are used on topofils.
Using calibrate clino. If 0 is up, use: calibrate clino 90 -1 If 0 is down: calibrate clino 90 1
- How do I pass dive data? I just put the depth instead of the slope and I set "meters" for the "depth" instrument?
It depends, if you have interleaved data or not. This is simple example: data diving from to compass fromdepth todepth tape
- The Therion book would gain much clarity by providing examples for each command.
Therion should have basicly the same syntax of centerline data as survex has, so you should look at survex manual. HTH, S.