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Details for Benchmark: JU0487

N 39° 16.883 W 074° 33.983 (NAD 83)

Altitude: 8.63

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

Location:
In CAPE MAY county, NJ View Original Datasheet
Designation:
N 56
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Wesley Avenue Grammar School was demolished in roughly 1988. Description lists benchmark as located in wall of building. Site now contains a small park, dedicated in 1990. I found no evidence of a benchmark at coordinates or elsewhere in the vicinity.

[last edit: 10/10/2003 9:19:38 PM PST]

Documented History (by the NGS)

01/01/1961 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 AT OCEAN CITY. IN THE NORTHWEST BRICK WALL AT THE NORTH CORNER OF THE WESLEY AVENUE GRAMMER SCHOOL, 165 FEET SOUTHWEST OF THE SOUTHWEST CURB OF 4TH STREET, 66 FEET SOUTHEAST OF THE SOUTHEAST CURB OF WESLEY AVENUE AND 2 FEET SOUTHWEST OF THE NORTHEAST CORNER OF THE BUILDING. SET IN A VERTICAL DRILL HOLE TWO FEET ABOVE THE LEVEL OF THE SIDEWALK.
01/01/1979 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 RECOVERED IN GOOD CONDITION.
01/01/1981 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1981 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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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