[Therion] Difference between Therion and Survex when calibrating tape

Tarquin Wilton-Jones tarquin.wilton-jones at ntlworld.com
Fri Aug 14 20:47:48 CEST 2020


Hi folks,

Think I may have uncovered a bug in Therion's parsing of the "calibrate
tape" command.

Survex:
*calibrate tape 0 0.5
*calibrate tape 0
1 2 10 0 0
*calibrate tape 0 1
2 3 10 90 0

Therion:
calibrate tape 0 0.5
calibrate tape 0
1 2 10 0 0
calibrate tape 0 1
2 3 10 90 0

In Survex, both legs are 10 m long. In Therion, the first leg is 5 m
long and the second is 10 m long.

Therion book:
"The syntax is borrowed from Survex with minor modifications; the Survex
manual may be useful as an additional reference for the user."

Survex manual does not say what happens to the scale value when it is
omitted, but it does say "By default, the zero error is 0.0 and the
scale factor 1.0 for all quantities." This implies that the scale value
should reset to 1 whenever it is omitted.

Assuming Survex is "right" with this behaviour, does that mean Therion
is wrong? Or is this one of those "minor differences"?

Or if I just messed up, someone please shout at me ;)

Cheers,

Tarquin



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