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Details for Benchmark: CL0531

N 32° 39.983 W 083° 19.450 (NAD 83)

Altitude: 504.86

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

Location:
In TWIGGS county, GA View Original Datasheet
Designation:
Z 275
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

01/01/1962 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1962 1.8 MI SE FROM JEFFERSONVILLE. ABOUT 1.8 MILES SOUTHEAST ALONG THE SEABOARD AIR LINE RAILROAD FROM THE STATION AT JEFFERSONVILLE, 0.3 MILE NORTHWEST OF MILEPOST 25, NEAR THE NORTH CORNER OF A FENCE AROUND THE BARN OF THE TWIGGS COUNTY STABLES, 118.5 FEET SOUTHWEST AND ACROSS U.S. HIGHWAY 80 FROM THE SOUTHWEST RAIL, 46.5 FEET SOUTHWEST OF THE CENTERLINE OF THE HIGHWAY, 148 FEET NORTHEAST OF THE EAST CORNER OF A LONG BUILDING WHICH IS USED FOR A STABLE, 7 FEET SOUTH OF A FENCE CORNER, 1 FOOT NORTHEAST OF A FENCE LINE, 1.6 FEET NORTHWEST OF A STEEL WITNESS POST, 1/2 FOOT ABOVE THE LEVEL OF THE HIGHWAY AND SET IN THE TOP OF A CONCRETE POST PROJECTING 4 INCHES ABOVE THE LEVEL OF THE GROUND.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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