[Therion] Calculation of LRUD from splays

[Tarquin Wilton-Jones]

Hi Markus

Don't worry, your English is fine :)

Not sure why you would want to remove the useful splays, and replace
them with limited LRUDs, but I assume you have a reason.

> is there a possibility to calculate LRUD-Data from splays? It would be
> nice, if you have not measured LRUD at the point in the cave, but only
> splays for drawing.


If you are starting with (simple) Survex files or PocketTopo data, Cave
Converter can create LRUD data, and turn it into "passage" blocks (which
are basically just LRUD data). It does it by taking the largest splay
that appears to be perpendicular-ish to the passage, and works out its
perpendicular size.

However, it is only an approximation, and it is not perfect. It also
only understands simple Survex files or PocketTopo data - it cannot cope
with Therion files. It cannot cope with data containing "data nosurvey",
so you must use only the default "data normal". It also removes anything
that it doesn't understand, so you lose your fixes and entrances.

But maybe it is useful enough for your needs:
http://wscc.darkgem.com/caveconverter/

Hope this helps,

Tarquin