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Details for Benchmark: KU4903

N 40° 43.828 W 073° 34.395 (NAD 83)

Altitude: 86

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

Location:
In NASSAU county, NY View Original Datasheet
Designation:
11E 12N AZ
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Found in good condition

[Photos:]
photo

Found while geocaching

Found on the way to Event in the park. Marker is in grass right off Parking lot 5 and coordinates are accurate. The first log on this Benchmark on 05/21/2005 by Harry Dolphin should have posted to the nearby KU4550 as well as the STATION RECOVERY (2005) Note on the www.ngs.noaa.gov website and benchmap app. "RECOVERY NOTE BY GEOCACHING 2005 (PR) COORDINATES ARE GOOD. LOCATED IN EISENHOWER PARK. IT IS IN AN ASPHALT SIDEWALK, BETWEEN THE MINIATURE GOLF COURSE, AND A REFRESHMENT STAND." That note accurately reflects KU4550.

[Photos:]
photoKU4903

Found in good condition as described.

[Photos:]
photo
photo

Found as described.

[Photos:]
photo11E 12N AZ

Found it with little problem. Coordinates are good. It is located in an asphalt sidewalk between the miniature golf course and the refreshment stand. The cover does not open. It is secured.

[Photos:]
photoKU4903 - Area shot
photoKU4903 Shot from above
photoKU4903 Close up

Documented History (by the NGS)

01/01/1990 by SBAS (MONUMENTED)
DESCRIBED BY SIDNEY B BOWNE AND SON 1990 THE POINT IS LOCATED IN EAST MEADOW, TOWN OF HEMPSTEAD, IN EISENHOWER MEMORIAL PARK, 106 FEET (32.3 M) SOUTH OF THE CENTERLINE OF THE EASTBOUND LANES OF PARK BOULEVARD (BICENTENNIAL BOULEVARD) AND 1500 FEET (457.2 M) EAST OF THE CENTERLINE OF MERRICK AVENUE,IN THE GRASS AREA SOUTH WEST OF PARKING FIELD 5. THE LOCATION TIES ARE 32.0 FEET (9.8 M) FROM THE SOUTH WEST CORNER OF THE FACE OF THE CURB, 74.5 FEET (22.7 M) FROM THE NORTH WEST CORNER OF THE FACE OF THE CURB AND 90.8 FEET (27.7 M) FROM THE SOUTH WEST CORNER OF LIGHT POLE NUMBER 45.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in January 1999.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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