Details for Benchmark: KU4903
N 40° 43.828 W 073° 34.395 (NAD 83)
Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)
- In NASSAU county, NY View Original Datasheet
- 11E 12N AZ
- Marker Type:
- NGS Benchmark
- setting not listed - see description
- Most reliable and expected to hold position/elevation well.
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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.
- 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- The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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.