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Details for Benchmark: AT0482

N 29° 55.767 W 089° 59.867 (NAD 83)

Altitude: 3.22

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

Location:
In ORLEANS county, LA View Original Datasheet
Designation:
P 196
Marker Type:
bench mark disk
Setting:
retaining walls, concrete ledge, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

01/01/1964 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1964 IN ALGIERS. AT ALGIERS, ALONG GENERAL MEYER AVENUE, NEAR THE INTERSECTION OF HUDSON PLACE, 38 1/2 FEET NORTH OF THE CENTER LINE OF THE AVENUE, 201 FEET EAST OF THE CENTER LINE OF HUDSON PLACE, 37 1/2 FEET EAST OF A HISTORIC SIGN MARKER, SET ON THE TOP OF THE WEST END OF THE NORTH CONCRETE HEAD WALL OF A 4 FOOT BOX CULVERT UNDER THE AVENUE AND 2 FEET BELOW THE LEVEL OF THE AVENUE.
01/01/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION EXCEPT DELETE 37-1/2 FEET EAST OF A HISTORIC SIGN MARKER.
10/25/1990 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990 IN ALGIERS, AT THE INTERSECTION OF GENERAL MEYER AVENUE AND DANBURY DRIVE, IN TOP OF AND 0.2 M (0.7 FT) SOUTHEAST OF THE NORTHWEST END OF THE NORTHEAST CONCRETE HEADWALL OF A BOX CULVERT UNDER THE AVENUE, 39.5 M (129.6 FT) NORTHWEST OF THE EXTENDED CENTER OF THE DRIVE, 11.7 M (38.4 FT) NORTHEAST OF THE AVENUE CENTERLINE, 6.8 M (22.3 FT) SOUTHWEST OF A UTILITY POLE WITH A WITNESS SIGN ATTACHED, AND 0.7 M (2.3 FT) BELOW THE LEVEL OF THE AVENUE.
12/02/1994 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1994 (GAS) IN ALGIERS, AT THE INTERSECTION OF GENERAL MEYER AVENUE AND DANBURY DRIVE, IN TOP OF AND 0.2 M (0.7 FT) SOUTHEAST OF THE NORTHWEST END OF THE NORTHEAST CONCRETE HEADWALL OF A CULVERT UNDER THE AVENUE, 39.5 M (129.6 FT) NORTHWEST OF THE EXTENDED CENTER OF THE DRIVE, 11.7 M (38.4 FT) NORTHEAST OF THE AVENUE CENTERLINE, 6.8 M (22.3 FT) SOUTHWEST OF A UTILITY POLE WITH A WITNESS SIGN ATTACHED, AND 0.7 M (2.3 FT) BELOW THE LEVEL OF THE AVENUE.

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 December 1996.
  • 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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