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Jeyapalan, Kandiah 
  
CONCLUSION 
Total Station can be used to collect data for creating 2D GIS showing roadside features at a scale of 1"—25' or larger 
and or smaller. DGPS can be used for maping at scale 1" — 50'or smaller. Both systems are time consuming in the field. 
Soft Photogrammetry with digital videologging imagery can be used to map roadside features at 1"—25' or smaller. It 
saves field data collection time; however, it requires calibration and stereo data collection time in the office. Virtual 
reality can be used to vizulize in 3D, fly through to simulate driving conditions and to visulize modifications prior to 
construction 
ACKNOWLEDGEMENT 
Thanks are due to WADOT and FHWA for supporting the research at Iowa State University, to Les Olson and his staff 
in Thurston County, WA for collecting Total Station and DGPS data, to Mandli Inc and Transmap Inc for providing the 
video images, to Autometric Inc for the Softplotter and the Silicon Graphics Inc for the hardware. Also, we like to 
thank Ed Jaselskis, Duane Smith, Brandon Stephan, and Charles Benard of ISU for their participation in the research 
study. 
REFERENCES 
1. Jaselskis, E. J., Jeyapalan, K., Bhagawati, D. et al. (1999). Automated Data Acquisition of Road Side Features, ISU, 
WADOT, FHWA. 
2. Jeyapalan, K.,Yao, W. et al. (1998). Soft Photogrammetry, ISU, IADOT. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 413