[Therion] Scaling issues with .3d files

Wolfgang Zillig wolfgang.zillig at web.de
Wed Mar 15 13:38:25 CET 2006


I don't think that this is UTM. UMT has usually 7digits in y-direction 
and 6 in x-direction.

Wolfgang

Philip Balister schrieb:
> 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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