> Hmmm..... Maybe I am not using the splay flag correctly? Is there
> another flag that might be more appropriate?
flags duplicate = a leg that must not count towards the length. It can
count towards the vertical range, if it is the highest or lowest point
in the cave. Use this when you have had to survey twice (or more) down
the same passage. Also use it if you are going from a station in a
passage whose length was already included with the legs going down the
passage itself, and the new legs are used to reach the start of a side
passage, where the main passage is really wide (such as a station on the
left wall of a 50m wide passage, and you need to get to a side passage
on the right wall). This is particularly useful when you have a side
passage you did not have a useful fixed station for, and the nearest
fixed station is a long way down the passage, so you will need to
resurvey from that fixed station, back down the passage you already
surveyed, to reach the side passage. As Olly said, this is the one you want.
#survey from fixed station to AB side passage
flags duplicate
megacairn AB1 12.34 27.5 1.5
AB1 AB2 8.97 42.93 -21.5 #AB2 is start of side passage
flags not duplicate
flags splay = a shot from a station towards a wall, ceiling, floor or
other solid object, such as a stalagmite. Therion uses these to build
the walls in the .lox file. Normally, you use anonymous splays like this
("-" instead of a station name):
AB1 - 1.234 12.5 -17.5
However, sometimes *rarely* you might want to name a splay, such as a
splay that hits something important like a named formation. Imagine you
have a stalagmite called "Medusa", you might do this to tell Therion "I
know this looks like a station, but it's a named splay":
flags splay
AB1 medusa 1.234 12.5 -17.5
flags not splay
flags surface = a leg or splay that is on the surface, not in the cave.
This will not be used for length, depth, or wall generation. It
basically tells Therion to ignore it for cave statistics, and for wall
generation. This might be used for the legs that go from the cave
entrance to your fixed location on the surface, or for splays that go
from a surface station to a surface feature, such as a cliff face
outside the cave.
station 2 "Alpha Cave" entrance
flags surface
fixedpoint 1 12.345 27.5 1.5
#splays around the outside of the entrance
1 - 0.555 237.50 -37.67
1 - 0.882 258.89 -16.29
1 - 0.895 296.19 -14.58
1 - 1.198 320.46 -3.11
1 2 1.266 62.55 -31.87
flags not surface
> BU1 BU2 11.6 53.1 84.4 228.4 -84.9 16.8 2.2 1.1 11.6
Oh, this is interesting. I was wondering if you had used "UP" to get
from BU1 to BU2. In such a case, LRUDs are quite useless, as a leg has
no direction, so Therion has no information about which direction is
"left" or "right", so it might have had to make things up and got it
wrong. (Splays are vastly superior to LRUDs, because each one has an
explicit direction, so you can point to all walls of a pitch, not just 2
of them.)
I had expected maybe it was generating walls without any idea where to
point them, but that seems not to be the case, since you have an actual
direction for that leg.
So it seems the most likely cause for your problem is indeed the "flags
splay" where you meant "flags duplicate".
However, I would need more of the data forming that part of the cave to
be sure, since when I tried to compile your snippet, it did not show the
problem. Maybe it only shows up when you have both the old and new data.
I also have never seen data in this format, and am curious as to what
your "data" command looks like. It looks like it should be this:
data normal from to tape compass clino backcompass backclino left right
up down
But Therion won't let me use that, because the compass and backcompass
are not perfectly opposite. I am wondering if it gets confused when you
ask it to use all the data columns (I told it to ignore the backcompass).
Equally curious about what your measurement device is, since you are
getting only 10 cm accuracy (suggesting a measuring tape) and yet .1
degree precision compass and clino, which seems incredibly precise for
manual tools, especially considering the forward and backward devices
seem to disagree with each other by as much as 2.1 degrees (compass) and
1.1 degrees (clino). There is a huge 4.7 degree disagreement on the
BU1-BU2 leg. (Because the devices are being used nearly vertically, so
compass error is increased. Plumbed legs would normally be recommended
when using manual devices.) Whenever I have seen high quality data from
manual devices, the compass and clino have been given to 0.5 degree
precision, because that is the reading limit of the devices.
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