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Details for Benchmark: KV0569

N 40° 40.767 W 074° 00.100 (NAD 83)

Altitude: 35.78

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

Location:
In KINGS county, NY View Original Datasheet
Designation:
366 NYBE+A
Marker Type:
chiseled cross
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found as described, below mark 367 NYBE+A, just to the right of the main Henry Street entrance of the school. Reprints of the Koop book are available on Amazon.com, and the book is invaluable for finding these 100 year old marks.

[Photos:]
photo366 Chisled Cross
photo366 and 367

Found as described in good condition.

The monumentation date on the datasheet is wrong. It was actually monumented in 1909. This bench mark is one of the over 1100 marks set in 1909-1913 in the first city-wide survey done after the consolodation of the 5 boroughs of the city in 1898. The survey is documented in the volume [i]Precise Leveling in New York City[/i] by Frederick W. Koop, available in the NY Public Library. "NYBE+A" stands for the New York Board of Estimate and Apportionment.

[Photos:]
photoKV0569 "366 NYBE+A" setting, Redhook,Brooklyn
The two marks are set one above the other in the base of the school.
photoKV0569 "366 NYBE+A", Redhook, Brooklyn NY

Documented History (by the NGS)

01/01/1934 by NYBE+A (MONUMENTED)
01/01/1952 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1952 AT NEW YORK. AT NEW YORK, IN BOROUGH OF BROOKLYN, NEAR JUNCTION OF HENRY STREET AND 3RD PLACE, A 1 1/2-INCH CHISELED CROSS IN VERTICAL FACE OF OLD PORTION OF PUBLIC SCHOOL NO. 142, 11 FEET NORTH OF CENTER OF NORTH ONE OF EAST ENTRANCES TO BUILDING, 1 1/4 FEET BELOW BENCH MARK 367(B.E. AND A.) AND 1/4 FOOT ABOVE LEVEL OF SIDE WALK.

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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