diffpos — compare the contents of two .3d files
diffpos .3d file .3d file [threshold]
Diffpos reports stations which are in one file but not the other, and
also stations which have moved by more than a specified threshold
distance in X, Y, or Z. The threshold distance is given in metres and
defaults to 0.01m if not specified.
For backward compatibility diffpos will also read the .pos files
produced by earlier versions of cavern, or by 3dtopos.
3dtopos(1), aven(1), cad3d(1), cavern(1), extend(1), sorterr(1),