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Details for Benchmark: BS0990

N 31° 58.217 W 083° 47.383 (NAD 83)

Altitude: 302.21

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

Location:
In CRISP county, GA View Original Datasheet
Designation:
D 79
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)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 AT CORDELE. AT CORDELE, CRISP COUNTY, 0.3 MILE NORTHWEST ALONG THE ATLANTIC COAST LINE RAILROAD FROM THE STATION, 0.25 MILE NORTH OF MILEPOST 163, 130 FEET EAST OF THE POINT OF A SWITCH TO THE SOUTH, AT A STREET CROSSING, 39 FEET WEST OF THE CENTERLINE OF THE STREET, 20.5 FEET NORTH OF THE NORTH RAIL, AND 10 FEET WEST OF THE SOUTHEAST CORNER OF A FENCED YARD. A STANDARD DISK, STAMPED D 79 1934 AND SET IN THE TOP OF A CONCRETE POST.
01/01/1972 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 MARK NOT FOUND.
02/25/1995 by LOCENG (GOOD)
RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1995 (WCM) RECOVERED AS DESCRIBED.

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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