[Therion] Add Coordinate data back at last level of Survey Hierarchy?

[Andrew Atkinson]

I've not had time to play with this, since Alistair showed me the problem
on the weekend. The bit that I cannot get my head round is when 3d are
imported with a coordinate system, if a th centreline then connects 2 parts
of the survey from the 3d or an entrance coordinate is specified for the
3d, how does this change, or can it change the coordinates of the data from
the 3d as the stations from this already has coordinates with little
information about the connections  [I hope that makes sense]

Andrew

On Wed, 14 Nov 2018, 18:45 Bruce Mutton via Therion <therion at speleo.sk
wrote:

> Not sure I understand you situation properly.  And I have no experience
> using .3d files as input.
>
> However, in general...
>
> If you have multiple surveys, each with a different (but not arbitrary)
> coordinate system set, then there should be no problem if you identify the
> coordinate system in each low level (survey trip) survey.  Each one can be
> different.  ie cs lat-long in one, cs EPSG:27200 in another, and cs
> EPSG:2193 in another.  On occasion I specify multiple cs in each input file.
>
> Then you can specify the output coordinate system in the thconfig file.
> If more than one is specified in the thconfig, then only the last one is
> used.   Ie all outputs must share the same cs.
>
> Looking at the wiki and Therion Book, I am not sure that the input side of
> this problem is well documented.
>
> Bruce
>
> -----Original Message-----
> HI,
>
> I was trying to join a file [with Centreline driven by .3d data (.3d)] to
> another file [with centreline driven by my electronic surveying data
> (Elec)].
>
> The .3d file seems to come with it's own coordinate system, so we needed
> to remove(#) the entrance coordinates, from the Elec data.
>
> I have joined these two surveys in a .th file and successfully got an
> output. There are two entrances to the system.
>
> So my question is, can I add back coordinate data for one (or more)
> Entrance(s) at the last level of the survey hierarchy? or will the mismatch
> between .3d and Elec prevent me from doing this?
>
>
>  Regards,
>  Alastair Gott.
>
>  AlastairGott at hotmail.com,
>  M: 07931779380,
>
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