areas, and figure 22B shows a profile terminating on the upslope 

 side of a seamount in the next area to the north. Figures 22B 

 and 22C show that the cubic spline can follow both convex and 

 concave submarine topography equally well. 



Figure 23 shows two mirrcr-image prof iles, which illustrate 

 the profile repeatability along the same path in either direction. 

 Profile A was run from west to east, then profile B was run from 

 east to west, both along the same path. 



FURTHER MODIFICATIONS, ADDITIONS AND OTHER APPLICATIONS 



The first modification to SYNBAPS will replace the great- 

 circle subroutines, GCPATH and GCDIST, in the accessing phase 

 with geodesic subroutines, GEODIST and GEOPATH. The argument 

 list for the new routines will be the same as for the great 

 circle routines. The second modification will replace the contour 

 checking program, SYNC0N2R, in the structuring phase with a 

 smoother contour plotting program. A third modification will 

 attempt to increase the overall efficiency (speed of operation) 

 by simplifying the programs. One example is to use buffering 

 statements when writing and reading on the temporary magnetic 

 tape . 



An additional program to operate on the SYNBAPS output will 

 be an updated automatic depth correction routine based on 

 Matthews' sound velocity correction tables. This will permit 

 the use of depth values either corrected or uncorrected for 

 speed of sound in sea water. 



An additional version of SYNBAPSl, the accessing program, 

 called SYNBAPS2 is being considered. This program will generate 

 eight radial profiles simultaneously from one point to the edge 

 of a MSQLOC area or an irregular chart area. This output could 

 be useful for profile evaluation of site locations where greater 

 detail is required. In addition, SYNBAPSl can be merged with the 

 NODC Ocean Station Data file to produce a composite plot of the 

 bottom profile and selected sound velocity profiles along a 

 great-circle path. Extending this concept one more step will 

 produce profile plots of various acoustic environm.ental parameters, 

 such as depth to the axis or bottom of the deep sound channel, by 

 marrying SYNBAPS to an appropriate oceanographic data file or 

 files. The number of possible combinations of oceanographic data 

 with the depth data using SYNBAPS is almost infinite. 



A system similar to SYNBAPS, but using land topography, 

 could be applied in radar terrain studies and weather pattern 

 models requiring elevation data. 



40 



