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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
443 
'"m, 
1« 3C0 2» 30D 360 
500 553 
Figure 5. The simulated LADAR data on the input DEM 
Figure 6. The simulated LADAR data 
4. CONCLUSIONS 
In this study, we derive the LADAR sensor equation and 
present a simulation method based on this equation using a ray 
tracing algorithms. Using this method, we have successfully 
generated simulated LADAR data based on an input DEM and 
the specified system parameters. 
The simulated data acquired by the simulator developed by this 
study will be effectively contributed to developing the data 
processing algorithms for diverse LADAR applications as the 
developments require various test data to assess the 
performance of the algorithms being developed. Furthermore, 
since the simulation will enable to determine the data quality to 
be acquired more economically and rapidly before the actual 
flight, it will be usefully applied to optimizing the system 
parameters during the development of a LADAR system. 
the elevation difference [m] 
-15 -10 -5 0 5 10 15 
the elevation difference [m] 
Figure 7. The histogram of the elevation differences between 
the simulated LADAR points and the input DEM 
REFERENCES 
Kamerman, G. W., 1993. Active Electro-Optical Systems. SPIE 
Optical Engineering Press, Vol.6, pp. 3~9. 
Lee, I., 2003. Verification and Calibration of LIDAR Databased 
on Simulation with High-resolution DEMs. KSCE Annual 
Conference, pp. 4436-4440. 
Lee, L, et. al., 2005. A Study on Establishing Multi-dimensional 
Spatial Information, National Geographic Information Institute, 
pp. I-13— 38. 
Schenk, T., 2001, Modeling and analyzing systematic errors of 
airborne laser scanners. Technical Notes in Photogrammetry 
No. 19, The Ohio State University, Columbus, OH, USA. 
ACKNOWLEDGEMENTS 
This research was supported by the Defense Acquisition 
Program Administration and Agency for Defense Development, 
Korea, through the Image Information Research Center at 
Korea Advanced Institute of Science & Technology under the 
contract UD070007AD.