questions on therion

[Martin Budaj]

> a) I try to get an overlay of the centreline on a scanned 
> topographical map but I always get an error ( test.th [47] -- number 
> expected -- end) but I don't know where to insert more numbers examplecode:
>     surface
>     bitmap ur.png  [1  11  211065.0  2139614.0  6310  4474  237623.0 
>  2158455.0 meters]    grid-units meters    grid 211000.0 2139000.0 
> 20000.0 15000.0 2 2
>     10.0 10.0 10.0 10.0    end surface

'end surface' should be written without space; the 'end' hadn't been 
recognized as a keyword and therion expected another row of numbers.

If you want only to display scanned map, grid-units and grid commands are not 
necessary -- they are only used in 3d model. 

> b) at loops: is the standard error for the measurement devices 
> included when the loops are closed? IE when more than one GPS 
> measurements (with high errors are used to fix the cave)?

Yes.

Martin