[Therion] FYI Therion explorer name and explored length counting insight

[Bruce Mutton]

This is just an 'I should have known better' story, in case you are
interested.

 

Learnings about map output statistics (that are or probably should have been
self-evident):

This is for a cave where some plan scraps were drawn on the original
centreline and were retained in the final map, when the entire original
survey was made duplicate due to a subsequent more comprehensive survey that
was flagged 'not-duplicate'. For the extended elevation scraps, these were
all drawn on the subsequent 'not-duplicate' survey.

1.	If a whole centreline is made 'flags duplicate' then the explorers
names appear in the list, but not the length that they explored (it is shown
as zero).  You must (also) add the explorers to the corresponding
'not-duplicated' centreline to have their explored length credited!
2.	Only the statistics for the centrelines that are (partly) included
in scraps that are output are presented.

 

For this plan map, where the duplicated centrelines are actually the ones
for which the scraps are exported, the 'not-duplicate' centrelines did not
have the explorer's names entered (repeated) and so their names are
recorded, but their survey length is not.  Lesson: Always record the
original explorers in subsequent survey centrelines.  This behaviour is nice
because it alerts the author to a problem with their data entry.



 

For this extended map, where the 'not-duplicate' surveys have scraps
exported, but the duplicate surveys do not, the 'duplicate' explorers names
are not presented.  This is appropriate behaviour.

But why is there a surveyor whose name appears with a zero length?  I think
it is because, for the entire 'not-duplicate' survey, I only contributed to
one survey leg (and it is in its very own centreline) and this leg is a
surface leg connecting the subsequent 'not-duplicate' survey to the original
'duplicate' survey.  So my name is recorded as a surveyor, but I have no
'cave length' and Therion records zero.  Possibly this is not ideal
behaviour, but it would seem inconsistent to change it.



Here is part of the html survey-list for the cave, with the statistics
discussed above highlighted.



 

I then thought that if I associated the cave survey with the plan and the
elevation maps, the statistics might have been better (a feature that I was
involved in requesting if I recall correctly).  They are.

For the plan, there is no change (I still need to add the original explorers
to the 'not-duplicate' centrelines).



 

And for the extended elevation, the duplicate zero length explorers names
are brought in, as have the surveyors for the centrelines for which there
are no scraps.  It matches the plan statistics.  Perfect (once I fix my
centreline metadata as mentioned above).



 

Bruce

 

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