Depths of data points were not indicated in the original NO DC BT 

 profile format, save by data position relative to the first data value reported. 

 The depth of a regression point must be more explicitly identified. Hence, 

 some portion of the savings effected in the number of points required to 

 represent a profile is absorbed by the weight of additional data r>eeded to 

 specify the depths of regression points. If it is assumed that an equal number 

 of digits are needed to encode depth and temperature, then it follows that the 

 volume of the BT profile data has been reduced by a factor of 2 or 2.5 with 

 this program. This factor is further reduced if the RMS values are considered 

 as part of the product volume of the program. 



D. Production Time 



On an average, the program reduces about seven profiles per second 

 or twenty five thousand profiles per hour on the CDC 3800 computer facility 

 at the Naval Research Laboratory. This figure varies with the depth and 

 distribution regularity of a profile. It is estimated that the average profile 

 which provides this figure consists of about forty data points, and reduces to 

 about ten regression points. 



The major portion of program production time is consumed in the selecting 

 by trial and error of the initial set of thin line sets to fit the profile data. This 

 time may be reduced significantly by optimizing the subroutines "TF", "SQLINE", 

 and "CORD", and recoding them in assembly language. 



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