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Details for Benchmark: KW1135

N 40° 16.300 W 076° 51.283 (NAD 83)

Altitude: 611.06

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

Location:
In DAUPHIN county, PA View Original Datasheet
Designation:
HARRISBURG RM 2
Marker Type:
reference mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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The location of this one plots out to the area between 2 levels of asphalt road at the top of a contoured hill w/ no remaining outcrops..

The National Civil War Museum was built on this site in 2000 and the marks were destroyed. See KW1133.

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
1/1/1960 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1960 AT HARRISBURG. AT HARRISBURG, AT THE CITY RESERVOIR, ON THE TOP OF A HIGH HILL, ON THE TOP OF A ROCK WALL, 131.1 FEET WEST OF THE STATION, 20 FEET WEST OF THE CENTER LINE OF A STREET AND ABOUT 2 1/2 FEET ABOVE THE LEVEL OF THE STREET.

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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