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- W596489314 abstract "ASTRONOMICAL AZIMUTHS ARE USED FOR CONTROLLING LOCAL SURVEYS IN LARGE AREAS OF THE UNITED STATES WITHOUT FIRST OBSERVING ASTRONOMICAL LONGITUDES. NORMALLY, ASTRONOMICAL LONGITUDE IS USED TO OBTAIN THE LAPLACE CORRECTION FOR CHANGING AN ASTRONOMICAL AZIMUTH INTO A GEODETIC AZIMUTH. WHEN GEODETIC AZIMUTHS ARE NOT EASILY AVAILABLE FOR CONTROLLING TRAVERSES OR OTHER SURVEYS, AN ASTRONOMICAL AZIMUTH MAY BE OBSERVED AND THE COAST AND GEODETIC SURVEY MAY BE REQUESTED TO FURNISH AN INTERPOLATED LAPLACE CORRECTION. THIS CORRECTION MAY THEN BE ADDED TO THE ASTRONOMICAL AZIMUTH TO OBTAIN A GEODETIC AZIMUTH. IN FIRST- ORDER SURVEYING, A FIRST-ORDER LONGITUDE IS STILL REQUIRED, IN SECOND-ORDER WORK, HOWEVER, THESE INTERPOLATED CORRECTIONS ARE USUALLY OF SUFFICIENT ACCURACY. METHODS FOR OBSERVING THE AZIMUTH ARE DISCUSSED AS WELL AS THE LAPLACE CORRECTIONS. A MORE WIDESPREAD USE OF ASTRONOMICAL AZIMUTH CAN CONTRIBUTE TO IMPROVED CONTROL THROUGH THE APPLICATION OF INTERPOLATED CORRECTIONS. THIS ELIMINATES SECOND-ORDER LONGITUDE DETERMINATIONS WHICH REQUIRE EXTREME CARE AND EXACT TIMING. IF THE PERSONAL EQUATION OF THE OBSERVER IS NOT DETERMINED AT A FIRST-ORDER ASTRONOMIC STATION, THIS ERROR ALONE COULD PROBABLY BE AS GREAT AS THE LAPLACE CORRECTION ITSELF." @default.
- W596489314 created "2016-06-24" @default.
- W596489314 creator A5066577946 @default.
- W596489314 date "1967-12-01" @default.
- W596489314 modified "2023-09-28" @default.
- W596489314 title "ASTRONOMICAL AZIMUTHS FOR LOCAL CONTROL" @default.
- W596489314 hasPublicationYear "1967" @default.
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