Im order to determiiie the energy spectmm. of tke sea surface a grid of 

 spot .feeigbts must be made„ Accordingly, the next three models to be analyzed 

 presented tkis spot height data. A total of 5612 spot heights per model were 

 determined at 30 feet ground distances in a square grid pattern. 



The above described grapMcs were forwarded to N. Y, U. for analysis and 

 a. new verticaJ. datum was derived analytically. * From this information eight 

 spot h.ei^3!is were established along the model periphery. This information 

 was forwarded to the Hydrographic Office and was used to re-establish a verti- 

 cal datom oa. the final model set=up. This final model is shown in figure 6.2. 

 Of the eigkt spot heights, six were held photogrammetrically and two could not 

 be held. One of these was located in the left=center and. had an error of -3.0 

 feet? the other was located in the low^er-right corner and had an error of =7.0 

 feeto Table I shows the (NYU) computed values, the instrument values, and 

 t'fee errorsg for all eight points. 



Table L Final level values for the stereo wave data 

 Computed Instrument 



46 



