[Therion] Scaling issues with .3d files

Philip Balister philip at balister.org
Wed Mar 15 13:43:59 CET 2006

Hmm, you are correct. I need to check whcih svx file Philip is working 
with. The range in meters is confusing me. Guess I need to look closely 
at what is going on.


Wolfgang Zillig wrote:
> I don't think that this is UTM. UMT has usually 7digits in y-direction 
> and 6 in x-direction.
> Wolfgang
> Philip Balister schrieb:
>>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.
>>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 
>>>>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 
>>>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).
>>>    Olly
>>>Therion mailing list
>>>Therion at speleo.cz
>>Therion mailing list
>>Therion at speleo.cz
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