[Therion] Scaling issues with .3d files

Philip Balister philip at balister.org
Wed Mar 15 13:32:49 CET 2006


Olly,

Just for your info the 3d file Philip Schuchardt is working with has the 
coordinate system for the cave set up so the station coordinates are 
also the UTM coordinates. This makes overlays easy with geo-referenced 
surface maps. This would explain why the x,y numbers are large.

Philip

Olly Betts wrote:
> On Tue, Mar 14, 2006 at 08:19:36PM -0500, Philip Schuchardt wrote:
> 
>>10> Vertical range = 42949672.68m (from 20 at 42949672.68m to 21 at 0.00m)
>>11> North-South range = 42949672.86m (from 495 at 42949672.86m to 21 at 0.00m)
>>12> East-West range = 42949672.91m (from 15 at 42949672.91m to 21 at 0.00m)
> 
> 
> This looks like some weird coordinate wrap-around, since 42949672.91m is
> 0xfffffffb cm, which is -5cm if interpreted as a signed value.
> 
> I think the problem must be in the data being fed into Survex, since
> Survex itself doesn't store coordinates in integer cm until after this
> point (they're used to store coordinates in the .3d file).
> 
> Cheers,
>     Olly
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