SUBROUTINE 'CIRAZD' 



LANGUAGE - FORTRAN 

 COMPUTER - IBM 707A- 

 (COPY ON FILE AT NODC) 



FINDS THE DISTANCE AND AZIMUTH BETWEEN TWO POINTS ON THE EARTH<S SUR- 

 FACE WHEN THE EARTH IS ASSUMED TO BE A SPHERE. IF EITHER POlE IS USED 

 FOR THE CENTER POINT, THE ANGLE GIVEN IS WITH RESPECT TO GRID NORTH. 

 BY USE OF TRIGONOMETRIC IDENTITIES AND ABSOLUTE VALUE FUNCTIONS. THIS 

 PROGRAM AVOIDS MANY OF THE COMPUTATIONAL PROBLEMS USUALLY FOUND IN 

 DISTANCE COMPUTATIONS. O.S. NO. 55690. AUTHOR-- BARRY TURETT. 



NAUTICAL CHART DIVISION. CODE 5600 

 NAVAL OCEANOGRAPHIC OFFICE 

 SUITLAND, MD. 20390 



CIRCULAR CHARTING 



LANGUAGE - FORTRAN 

 COMPUTER - IBM 7074 



COMPUTES COORDINATES FOR CONCENTRIC CIRCLES AT SPECIFIED INTERVALS 

 ALONG LATITUDE AND/OR LONGITUDE WITH A FIXED BROADCASTING STATION 

 POSITION AS COMMON CENTER. COMPUTED DISTANCES ARE GEODESICS BASED 

 ON ANY SPECIFIED GEOID. OS NO. 20132. AUTHOR — CHARLES KIRKLAND. 



COMPUTER DEPARTMENT, CODE 0831 

 NAVAL OCEANOGRAPHIC OFFICE 

 SUITLAND, MD. 20390 



GEODETIC DATUM CONVERSION 



LANGUAGE - FORTRAN 

 COMPUTER - IBM 7074 



TRANSFORMS GEODETIC COORDINATES FROM ONE DATUM TO ANOTHER BY UTILIZING 

 A GIVEN SHIFT (IN TERMS OF RECTANGULAR SPACE COORDINATES) BETWEEN THE 

 ORIGINS OF TWO DATUMS AND APPLYING THIS SHIFT. TOGETHER WITH DIFFER- 

 ENCES IN THE SPHEROIDAL PARAMETERS, IN FORMULAS DERIVED FOR THIS PUR- 

 POSE. OS NO. 55305. AUTHOR — ROBERT M. WILLEMS. 



NAVIGATIONAL SCIENCE DIV., CODE 5300 

 NAVAL OCEANOGRAPHIC OFFICE 

 SUITLAND, MD. 20390 



GEODETIC DATUM REDUCTION 



LANGUAGE - FORTRAN 

 COMPUTER - IBM 7074 



REDUCES GEODETIC POSITIONS FROM ONE GEODETIC DATUM TO ANOTHER BY USE 

 OF THE VENING MEINESZ EQUATIONS. THE PREFERRED DATUMS INVOLVED ARE 

 EUROPEAN DATUM. NORTH AMERICAN DATUM AND TOKYO DATUM. OS NO. 55301. 

 AUTHOR — D.J. FINDlAY. 



NAVIGATIONAL SCIENCE DIV., CODE 5300 

 NAVAL OCEANOGRAPHIC OFFICE 

 SUITLAND. MD. 20390 



COMPUTE GEOGRAPHIC POSITIONS LANGUAGE - SPS 



COMPUTER - IBM 1620 

 (COPY ON FILE AT NODC) 



USCGS PROGRAM NO. 15. COMPUTES GEOGRAPHIC POSITIONS. GIVEN STARTING 

 POSITION. AZIMUTH, AND LENGTH ON ANY ONE OF SIX SPHEROIDS. THREE TYPES 

 OF COMPUTATIONS CAN BE OBTAINED— SINGLE POSITIONS. A LOOP. OR A TRA- 

 VERSE. CONTROL IS BY JOB CARD. LENGTH INPUT MAY BE IN METERS, FEET, 

 STATUTE OR NAUTICAL MILES, OR ELECTRONIC lANES. 



ESSA, COAST AND GEODETIC SURVEY 

 WASHINGTON SCIENCE CENTER, BLDG. 2 

 ROCKVILLE, MD. 20852 



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