Port coordinate extraction mainly adopts the strategies on 
junction plane characteristics; planar fitting errors is +2mm , 
outside corner points is fitted. 
Data analysis using corresponding points of port to 
coordinate comparative analysis, the corresponding 4 fitting 
points are returned to the point cloud and compared with design 
position, specific port of welding deviation can be seen clearly. 
4.3.3 Analysis of Port Deviation 
All the ports feature points extracted are compared with design 
feature points in a form, and then the deviation of steel structure 
ports is displayed obviously. The deviation of ports is shown in 
Figurel4; the ports whose deviation exceeds the threshold can 
be adjusted according to the check results. 
  
Figurel4 the deviation of a single row ports 
5. CONCLUSION AND OUTLOOK 
By analyzing the principle of LIDAR and engineering examples 
application, it is proved that LIDAR technology used in the 
monitoring of large steel construction is applicable with the 
characteristics of high-speed, precision and integrated 
monitoring. The technology can greatly reduce the workload of 
data collection and improve the analysis accuracy and 
comprehensive and efficient the guidance and monitoring of 
construction compare with the traditional surveying methods 
point by point. 
The technique will be used more and more in the future 
architecture of construction, thus automatic feature point 
extraction would be efficient and precise data acquiring and 
registration automatically is also necessary for the technique. 
Acknowledgment 
This paper was founded by Funding for Natural Science of 
Beijing (KZ200910016001); Funding Project for Academic 
Human Resources Development in Institutions of Higher 
Learning Under the Jurisdiction of Beijing Municipality 
(PHR20110511). 
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