[Therion] Calibration of co-ordinate systems

[Andrew Atkinson]

Hi

I am having a little bit of difficulty with the various different helps 
on co-ordinate systems. I am building an area survey map from data from 
various different sources, so having to 'adapt' it, but really do not 
want to have to convert it all. It would be nice to have one of the 
outputs as .kml for google earth and the like.

Lots of the data is in Survex, with Local OSGB 6 figure grid references. 
These I have been importing eg

import Great_Swallet.3d -surveys use -filter great_swallet -cs 
EPSG:27700 -calibrate [0 0 0 299912 99991 0]
#Should be -calibrate [0 0 0 300000 100000 0]

(goodness knows why the calibrate is not right, the bodge is to align it 
on goodle earth, probably my ignorance)


As most of the new data is in Pockettopo imported, into therion, is 
attached to the survex data this has worked well.
One cave entrance has been done in therion direct but I just dealt with 
that by doing the calibrate manually

I have now been sent lots of data with lots (60 fix #ed points or more) 
of cave entrances, all in therion with local 6 figure grid references.

I can set the coordinate system to EPSG:27700 by adding it within the 
centreline/endcentre, but that puts the cave in the Atlantic somewhere. 
So using
centreline -cs EPSG:27700 -calibrate [0 0 0 299912 99991 0]
gives the error

not enough option arguments -- -calibrate -- must be 2

Which is fair enough as calibrate is already used in the centreline for 
correcting a zero error.

Not to be easily put off I tried it the other way round, remove the 
calibrate from the centreline and use

cs EPSG:27700 in the config files to get therion to output in these 
coordinates, however although I can get the caves relatively next to 
each other, the kml puts them in the Atlantic again and

cs EPSG:27700 -calibrate [0 0 0 299912 99991 0]

gives error

output coordinate system specification requires single parameter


and

cs EPSG:27700
calibrate [0 0 0 299912 99991 0]

gives error

unknown configuration command -- calibrate

Have I missed something or do I need to go through and add 300000 and 
100000 to all the fixed points. If this is so, could we have a 
calibratecs to use with the cs command to overcome localised coordinates 
on a national grid, the UK cannot be the only country with this problem, 
and it must be easier to work mainly in the more localised coordinates 
and calibrate it on output

hope this all makes sense,

Andrew