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Details for Benchmark: BR0930

N 31° 55.424 W 081° 53.517 (NAD 83)

Altitude: 149

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In TATTNALL county, GA View Original Datasheet
Designation:
BV 132 206
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Documented History (by the NGS)

01/01/1984 by GADT (MONUMENTED)
DESCRIBED BY GEORGIA DEPARTMENT OF TRANSPORTATION 1984 (WRN) THE STATION IS LOCATED ABOUT 3.85 KM (2.4 MI) EAST-SOUTHEAST FROM GLENNVILLE, 27.2 KM (16.9 MI) NORTH-NORTHWEST FROM LUDOWICI, AND 31.55 KM (19.6 MI) NORTH-NORTHEAST FROM ODUM. OWNERSHIP--STATE RIGHT OF WAY. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAYS 25, 301, AND STATE ROUTES 23 AND 144 IN GLENNVILLE, GO EAST-SOUTHEAST ALONG STATE ROUTE 144 FOR 2 KM (1.25 MI) TO THE GEORGIA NATIONAL GUARD ARMORY ON THE RIGHT. CONTINUE GOING EAST-SOUTHEAST ALONG STATE ROUTE 144 FOR 1.75 KM (1.1 MI) TO THE STATION ON THE RIGHT AT THE SIGHT OF TWO TANKS FROM THE NATURAL GAS COMPANY SHAPED AS HOT DOGS. THE STATION IS A STANDARD GADT DISK STAMPED---132-206 1984---, SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 30 CM IN DIAMETER AND FLUSH WITH THE SURFACE OF THE GROUND. IT IS LOCATED 9.57 METERS (31.4 FT) SOUTH FROM THE CENTERLINE OF THE HIGHWAY, 42.37 METERS (139 FT) NORTH FROM A POWER POLE, 9.36 METERS (30.7 FT) EAST FROM A 30 INCH CONCRETE PIPE UNDER THE HIGHWAY, 6.43 METERS (21.1 FT) WEST FROM THE CENTERLINE OF A DIRT DRIVEWAY TO THE SOUTH, AND 1.77 METERS (5.8 FT) SOUTH FROM A METAL WITNESS POST SET AT A MAIL BOX FOR S.A. FRIES. THE UNDERGROUND STATION IS A STANDARD GADT DISK STAMPED---132-206 1984---, SET IN AN IRREGULAR MASS OF CONCRETE 0.91 METER BELOW THE SURFACE OF THE GROUND. REFERENCE MARK NO 1 IS A STANDARD GADT DISK STAMPED---132-206 1984 RM 1---, SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 30.5 CM IN DIAMETER AND FLUSH WITH THE SURFACE OF THE GROUND. IT IS LOCATED 5.43 METERS (17.8 FT) NORTH FROM THE CENTERLINE OF THE HIGHWAY, 9.14 METERS (30 FT) EAST FROM A 30 INCH CONCRETE PIPE UNDER THE HIGHWAY, AND 0.98 METER (3.2 FT) WEST FROM A METAL WITNESS POST. AZIMUTH MARK NO 1 IS A STANDARD GADT DISK STAMPED---132-206 1984 AZ MK---, SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 30.5 CM IN DIAMETER AND FLUSH WITH THE SURFACE OF THE GROUND. IT IS LOCATED 5.15 METERS (16.9 FT) SOUTH FROM THE CENTERLINE OF THE HIGHWAY, 16.82 METERS (55.2 FT) SOUTH-SOUTHEAST FROM THE EAST END OF A 24 INCH CONCRETE PIPE UNDER A DRIVEWAY TO THE NORTH, AND 0.73 METER (2.4 FT) EAST FROM A METAL WITNESS POST. THE UNDERGROUND AZIMUTH MARK IS A STANDARD GADT DISK STAMPED---132-206 1984 AZ MK---, SET IN AN IRREGULAR MASS OF CONCRETE 0.91 METER BELOW THE SURFACE OF THE GROUND. TO REACH THE AZIMUTH MARK FROM THE STTATION, GO SOUTHEAST ALONG STATE ROUTE 144 FOR 0.55 KM (0.35 MI) TO THE AZIMUTH MARK ON THE RIGHT. THE STATION WAS OCCUPIED BY GLOBAL POSITIONING SYSTEM. COUNTY ROAD NUMBERS OBTAINED FROM--GENERAL HIGHWAY MAP TATTNALL COUNTY GEORGIA 1976. REVISED OCTOBER 1976. DESCRIBED BY P.R. MILTON.
09/05/1985 by (GOOD)
RECOVERED 1985 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in September 1997.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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