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Details for Benchmark: JU0488

N 39° 18.833 W 074° 33.967 (NAD 83)

Altitude: 5.4

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

Location:
In ATLANTIC county, NJ View Original Datasheet
Designation:
K 56
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)

01/01/1961 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 1.3 MI E FROM SOMERS POINT. 0.4 MILE EAST OF THE BRIDGE OVER BROAD THOROFARE, 22.6 FEET NORTH OF THE CENTERLINE OF LONGPORT BOULEVARD, 3 FEET WEST OF CABLE LINE POLE P 37235 AND 6 INCHES ABOVE LEVEL OF BLACKTOPPED ROAD. SET IN TOP OF CONCRETE POST PROJECTING 2 INCHES.
01/01/1983 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1983 MARK NOT FOUND.

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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