Hi Martin

I just thought I'd let you know that we have now found the solution to this 
problem.  As you suspected, the fault does not lie within the JTS Topology 
functions, but within the interpretation of the unioned polygons by the 
modelling software that I am using.  I am still slightly confused as to why the 
union command does not always place an identical ending co-ordinate to the 
starting co-ordinate, within the polygon, but this does not appear to cause a 
problem.

Thank you for your help.

Tanya

Tanya Richmond
Java Developer
WSB-LGN
GMS Team

Email: [email protected]<mailto:[email protected]>
Tel: +44 (0)115 936 3193

British Geological Survey: Kingsley Dunham Centre, Keyworth, Nottingham. NG12 
5GG.
Website: www.bgs.ac.uk<http://www.bgs.ac.uk/>
Tel: +44 (0)115 936 3100





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