Work in Metrology Division at Leica Geosystems.
	More than one affiliation shown as I'll be won't just be working for Leica from January but the work presented here is all done at Leica.
	Not a mathematician, just a simple engineer ..
	Some relatively simple mathematics lies behind a modern 3D measurement system – interesting fact in itself.
	First I need to explain a little about how the measuring systems work and where they can be used.