5. CONCLUSION 
We have systematically formulated a semi-automatic solution 
of inner-building communication data extraction for emergency 
evacuation simulation. And this solution takes proper usage of 
spatial relationships and geometric features of artificial 
buildings. The experiment shows the solution is workable for 
large building group communication data extraction from 
existing 3D data files, i.e. in Sketch-up format. 
Nevertheless, our solution could be greatly improved from two 
directions. First, although we have divided a complex building 
into several minor parts to relieve the computational burden for 
computers, the spatial dividing product of the buildings is not 
very good. Therefore, a better dividing evaluation system for 
complex buildings should be developed. Second, the proposed 
solution uses multithread method to finish the extraction task, 
but the parallel-computing concept is not implemented in the 
extraction operation in each building part. This results in a 
waste of multi-core CPU computing resources. In the next step, 
we should implement the multithread mechanism in the lower 
level extraction process such as building part level. 
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XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
  
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