-100^ 



-50- 



0- 



UJ 



a 



50- 



100- 



oe. 



UJ 



^ 10* 



35 



106 141 177 212 247 283 318 353 



CUMULATIVE DATA POINTS DOWNTRACK 



388 424 



^ 10^ 



U 



h 



I 



I 



10^ 



10' 



'V^ 



o 



^ 10° 

 ^ 10-'- 



10- 



10-3 10-2 10-' 10° 



NORAAALIZED FREQUENCY (CYCLES /DATA INTERVAL) 



10' 



Figure 4-5 Illustration of an amplitude spectrum of sea floor topog- 

 raphy which has encountered the "white-noise" level in the 

 data. The spectrum of random noise has the form of a hori- 

 zontal line. This noise level, which was derived from data 

 collected by SASS, corresponds to a random component in the 

 spatial data with root mean square dispersion of 1.9 

 fathoms . 



