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Figure 7. Classified laser points. 
Figure 8. Surface derived from laser points. 
   
Figure 9. Surface from laser and manually measured 
breaklines. 
Figure 10. Surface from laser and automatically 
generated breaklines with added ground breaklines. 
5 SUMMARY 
This paper describes the development of a general scheme for the integration of laser and photogrammetric data. This 
scheme includes the development of a surface registration algorithm and a data fusion algorithm. Initial testing of the 
integration algorithm has been carried out using data over Ocean C ity, Maryland, USA. The testing has shown that the 
visible surface is more accurately represented using the combined data than when using either data set separately. 
Further research is required into the optimization of the 3D reconstruction of the surface discontinuities. The 
information obtained from this process determines the improvement that will be gained from the merging of the laser 
data and the photogrammetric data. 
ACKNOWLEDGMENTS 
This research project is partially supported by the United States-Israel Binational Science Foundation, grant no. 97-00433. 
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