[Therion] 3d to QGIS - different alignment

[Andrew Atkinson]

Hi all

Not strictly a Therion question, but the answer is likely to be in the 
data entry or the interpretation of data in Therion.

I'm slowly incorporating QGIS into my workflow, and trying to automate it.

As such I'm using a modified version of the survex 3d importer

https://github.com/AndrewAkinson/qgis3-survex-import_amend

So that items can be easily switched on and off I'm going down the line 
of importing the 3d files by cave rather than the generated one for the 
whole catchment

For now I'm doing it with the data in
http://www.cave-registry.org.uk/svn/CheddarCatchment/

Currently I'm working on the Longwood Valley area as Longwood Valley 
Sink has been recently discovered.

The directories I'm using

RRift/ (3d needs to be generated from survex)
LongwoodValleySink/
Longwood/ (Fake data with calibrate compass -90!)
Toothache/ (single leg)

In each of these directories the .th file generates a survex 3d file

Also in the the root there is a LongwoodValley.thcfg which has the above 
caves (plus maybe Charterhouse, GB, TynningsGS and Reads depending on 
how I left it)

In the diagram attached (hopefully this list does attachments!)

The Dark purple dots are the import of the 3d file that has Rhino, 
Longwood, LongwoodValley Sink and Toothache together. The light pink, 
yellow dots are the individual imports (and entrances from the MCRA 
database.) Also included is an overlay of a scree shot from aven, which 
agrees with the group import.

The question is why is Longwood different when imported as a 3d on its 
own compared with as a group? They are both using the same data!

Andrew
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