Salut,
I think you can use the "flag" directive :
(extract from the THBook)
flags ▷ set flags for following shots. The supported flags are: surface
(for surface measurements), duplicate (for duplicated surveys), splay (for short side
legs that are hidden in maps and models by default). These are excluded from length
calculations.
All shots having one of the stations named either ‘.’ or ‘-’ are splay shots by default
(see also data command).
If flag is set to approx[imate], it is included to total length calculations, but also
displayed separately in survey statistics. It should be used for shots, that were not
surveyed properly and need to be resurveyed.
Also “not” is allowed before a flag.
Example :
survey XXXX -title "Blablabla"
centerline
date 2017.10.01
team "zzz ZZZZ" notes
team "tttt TTTTT" clino compass tape
units length meters
units compass clino degrees
data normal from to length compass clino
flags duplicate
0 - 1.39 30.0 -0.8
0 - 2.56 344.8 -3.6
0 - 3.46 313.9 -2.2
0 - 2.13 270.4 1.5
0 - 2.56 339.4 45.3
0 - 2.43 276.2 26.0
0 1 10.47 336.5 -46.1
# ....
# all the shots you xwant to exclude from cave total length
# ....
flags not duplicate
# ...
# the normal shots
# ...
endcenterline
endsurvey
When you export a survey-list, you can see the total of each length type (surveyed, explored, duplicate, surface...).
Bonnes explos !
Bertrand