Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE (When Data 



EnferedJ 





REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



TR-813 



2 GOVT ACCESSION NO. 



3 RECIPIENT'S CATALOG NUMBER 



4. TtTLE (and Subtitle) 



STEREOSCOPIC MAPPING OF THE SEAFLOOR BY 

 A TOWED TWO-FISH SIDE-SCAN SONAR SYSTEM 



5, TYPE OF REPORT a PERIOD COVERED 



June 1973-June 1973 (2 weeks) 



6 PERFORMING ORG. REPORT NUMBER 



7. AUTHORfsj 



R. D. Hitchcock 



a CONTRACT OR GRANT NUMBERfs) 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



CIVIL ENGINEERING LABORATORY 

 Naval Construction Battalion Center 

 Port Hueneme, California 93043 



10 PROGRAM ELEMENT. PROJECT. TASK 



ZF61-5 12-001-025 



n. CONTROLLING OFFICE NAME AND ADDRESS 



Director of Navy Laboratories 

 Washington, D. C. 20376 



June 1974 



13 NUMBER OF PAGES 



27 



M MONITORING AGENCY NAME 4 ADDREBSfi/ dil/erenr Irom Conlrol/.nU Ofdre) 



15 SECURITY CLASS, ro/ "i/s reparO 



Unclassified 



ISa. DECLASSIFICATION 'DOWNGRADING 

 SCHEDULE 



16. DISTRIBUTION STATEMENT (ol IhU Reporl) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ol the obslracl entered In Block 20. 11 dillerenl Iron, Report) 



18. SUPPLEMENTARY NOTES 



Seafloor mapping, sonar mapping, seafloor map, contour map, stereo-sonar plot, digital 

 computer plot, side-scan sonar, towed fish. 



20 ABSTRACT (Continue on reverse side It necessary end Identity by block number) 



Sea trials were conducted to test the concept of constructing a seafloor contour map 

 by interfacing a manual stereo-sonar plotter with a digital computer. The at-sea work 

 utilized a pair of 100-kHz, side-scan, sonar fish towed at a lateral separation of 42 feet. 

 Real-time data on near-bottom scanning contained mutual interference effects which 

 prevented the stereoscopic fusing of corresponding sonar images. System component 



continued | 



DD 1 JAN 73 1473 EDITION OF 1 NOV 65 IS OBSOLETE 



Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE (When Dale Entered) 



MBL/WHOI 



D 03D1 DDMD3Tfl b 



