[Therion] Combining caves using different co-ordinate systems

[Stacho Mudrak]

Something goes definitely wrong here...

If no CS is defined in thconfig file, therion uses first CS that it founds
as output CS - therefore if you reverse input files, results change.

It looks to me, that transformations to coordinate systems you are using do
not work as expected. Unfortunatelly, I have no idea why it is like that -
it needs some more sophisticated debugging, but using WGS84/UTM as output
CS seems to work fine - see attached file.

Does it solve your problem?

S.

On 20 September 2014 23:12, Bruce <bruce at tomo.co.nz> wrote:

> Hmm, Seems you are right that it is wrong.
> I tried adding explicit select statements to the thconfig-both_csconfig.thc
> and changing the position of the cs within the file, with no change in
> behaviour.
> Looks like a bug to me.
>
> Only difference that I can see with how I use it is that I am using
> lat-long
> (sometimes but not always) and two variants of an EPSG specification (which
> if exhibited same behaiour would give 1000's km error), whereas you have
> not
> used an EPSG code for eur79z30.
>
>
> Clutching at straws...
> Does eur79z30 have an EPSG code, and if it does, does using it's EPSG code
> in place of eur79z30 fix the behaviour?
>
> Bruce
>
> -----Original Message-----
> From: therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] On
> Behalf
> Of Footleg
> Sent: Saturday, 20 September 2014 11:55 p.m.
> To: List for Therion users
> Subject: Re: [Therion] Combining caves using different co-ordinate systems
>
> I have checked that both my survey files have date and cs declarations
> inside centreline blocks. Each file generates the correct position when I
> generate a KML from either file alone.
> Next I tried to add a cs statement in my thconfig file. This appears to
> over-ride the cs I declared in the centreline block. So if I put a
> different
> cs declaration in the thconfig file to the cs declared in the survey data
> file, then this results in the kml output putting the cave in the wrong
> place.
>
> I have created a bear bones set of examples (attached). The cave should be
> on the edge of the open grass area and trees.
>
> thconfig-eur79Only.thc  Puts the cave declared with Eur79 datum in the
> correct place.
> thconfig-EPSGOnly.thc Puts the cave declared with EPSG:25830 datum in the
> correct place.
>
> thconfig-eur79csconfig.thc Declares the cave with Eur79 but specifies
> EPSG:25830 in the thconfig, and the cave now appears in the wrong place.
>
> The other files show various ways of including both caves, and they are
> rendered always with one in the correct place and one in the wrong place.
>
> Footleg
>
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