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Details for Benchmark: KU1257

N 40° 35.717 W 073° 59.750 (NAD 83)

Altitude: 14.37

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

Location:
In KINGS county, NY View Original Datasheet
Designation:
F 342
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Spent a mild winter's day benchmark hunting in Brooklyn, ending up with 26 marks out of 29 attempts.

Found this mark easily and it's in good condition. It's on the Cropsey Avenue side of the building's corner.

[Photos:]
photoF342 Disk
photoF342 Setting

Found as described in good condition.

[Photos:]
photoKU1257 "F 342" setting, Bensonhurst, Brooklyn NY
The arpartment building on Cropsey Avenue.
photoKU1257 "F 342", Bensonhurst, Brooklyn NY

Documented History (by the NGS)

01/01/1952 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1952 AT NEW YORK. AT NEW YORK, IN BOROUGH OF BROOKLYN, NEAR INTERSECTION OF CROPSEY AVENUE AND BAY 34TH STREET, SET VERTICALLY IN THE SOUTHWEST FACE OF AN APARTMENT BUILDING AT 2315 CROPSEY AVENUE, 1 FOOT NORTHWEST OF SOUTH CORNER AND ABOUT 3 FEET ABOVE SIDE WALK.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JD) 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.
  • 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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