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Details for Benchmark: LX2385

N 41° 27.100 W 073° 14.767 (NAD 83)

Altitude: 208.67

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
Z 74
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

01/01/1985 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 8.0 KM (5.0 MI) SW FROM SOUTHBURY. 8.0 KM (5.0 MI) SOUTHWEST ALONG INTERSTATE 84 FROM THE BUCKS HILL ROAD OVERPASS IN SOUTHBURY TO THE MARK ON THE LEFT, 0.2 KM (0.15 MI) NORTHEAST ALONG INTERSTATE 84 FROM THE ICHABUT ROAD OVERPASS, AT MOTORIST AID CALL BOX 201, 2.32 METERS (7.6 FT) SOUTH-SOUTHEAST OF THE SOUTHEAST EDGE OF THE HIGHWAY, 1.10 METERS (3.6 FT) SOUTHWEST OF AN ALUMINUM POLE WITH THE CALL BOX. NOTE--ACCESS TO DATUM POINT IS HAD THROUGH A 5-INCH LOGO CAP. THE MARK IS 0.42 METERS NNW FROM A WITNESS POST THE MARK IS 0.18 M BELOW HIGHWAY.

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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