[Therion] Map-connection issue

[Tarquin Wilton-Jones]

> Clutching at straws - I wonder if it because I define lowest level maps
> outside of the survey they are associated with?

Well, that is definitely different from me.

Every survey contains its own maps of its scraps.

survey foo -title "day 1 at the swamp"
  map fooMP -projection plan
    area1SP
    area2SP
  endmap
  centreline
    ...data...
  endcentreline
endsurvey

Each parent survey contains maps with any potential offsets:

survey thecave
  input foo/foo.th
  ...
  #these say how long the arrows should be
  # XP = exploded plan, in case you were wondering
  map fooXP -projection plan
    fooMP at foo [4 -47 m] none
  endmap
  ...
  #these say where the arrows should point to - ie. the total offset
  #of the "parent" piece of cave it connects to
  map thecaveXP -projection plan
    fooXP [123 15m] none
  endmap
endsurvey

The grandparent survey contains the whole area, minor caves, surface,
etc. and for testing purposes, I added another offset at this level, and
everything worked:

survey thevalley
  input thecave/thecave.th
  ...
  map valleyXP -projection plan
    thecaveXP at thecave [-20 123 m] none
    othercaveXP at othercave
  endmap
endsurvey

This is the basic structure that I try to maintain. I do not generally
have sub-sub-sub-surveys since none of my projects so far are big enough
to want to divide a cave into areas within areas. So I do not have any
data to test deeper. (Inception might come into play.)

Who knows why Therion likes my setup more?

Tarquin