APPENDIX C 



PHOTOGRAPHIC DEFINITION OF SEA CONDITIONS 



Photographs were taken with stereo-cameras during the sea voyages at estimated 

 State 2, 4, and 5 seas. Photogrammetric analysis results in wave profiles at various dis- 

 tances from the centerline of the ship; see Figure 13. By use of these profiles, it is possible 

 to obtain quantitative values of wave height and wave length which can then be treated statis- 

 tically to determine, for example, the mean value of the one-third highest waves, commonly 

 referred to as the significant wave height. 



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