[Therion] Joining maps with the join command

[Tarquin Wilton-Jones]

Hi all,

Thanks for that impressive load of answers,

> First of all you should input cave1.th and cave2.th to your survey caveaall! Therion must know the way to data. 


Ah yes, in my example I was simplifying to keep only the most important
lines visible and keep the question simple. That is one thing I should
have kept in :)

My real data does of course have the imports.

>   join GreenlinkUSumpsPlan_s2 at Greenlink GreenlinkFPlan_s1 at MiddleEarth 
> -smooth on


OK ... so that syntax does in fact exist. I had not expected it to be
valid (double @ symbol). I see Henry's example is using that same approach.

>    join jpwall04 at SwissM:end GUSwall02 at Greenlink:end


I thought this is what I had used, but it failed. So I assume I have
done something else wrong somewhere. Sadly the only error message I see
is "invalid map item", which made me assume I was using the wrong
approach. It's not a particularly helpful error message, since it
doesn't tell me either the name it doesn't like, or the property that it
doesn't like. Certainly don't want to complain about such an incredible
piece of software, but imagine how nice it would be to see this:
"invalid map item: jpwall04 at SwissM:*end*" ("end" is in bold/red)

With such highlighting, I would quickly be able to see that the initial
scrap reference is good, and the line reference is good, but the
linepoint is wrong. Oh well, this is probably not the best place for a
feature request.

> Although looking at it now, with the benefit of 10 more years of
> experience, I wonder if I could have used a simpler scrap to scrap join,
> with the -count 3 option.  [Refer to the description of join on page
> 40-41 of The Therion Book].


Yes, I had wondered how to join mine in a place where there are some
oxbowing avens (the caves join vertically through a series of holes,
only the main one of which is surveyed with true legs), without using
walls. It seems -count is indeed my answer! Very nice, thanks.

So now back to wondering what it doesn't like about my (apparently
valid) join.

Cheers all!

Tarquin