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Details for Benchmark: KV1179

N 40° 34.183 W 074° 37.267 (NAD 83)

Altitude: 68.62

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

Location:
In SOMERSET county, NJ View Original Datasheet
Designation:
G 26
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found by description.

[Photos:]
photoKV1179 Somerville Somerset NJ Close Up
photoKV1179 Somerville Somerset NJ View Northeast
Along Somerset Avenue

#25 BM. I started using the GPS but it was pointing well away from the described item so i turned it off. Went right to this one based on description.

[Photos:]
photoKV1179
Just where the description had it
photoFurther back view
Here I'm looking down towards the street and west along the railway.

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 AT SOMERVILLE. AT SOMERVILLE, SOMERSET COUNTY, 0.5 MILE WEST ALONG THE CENTRAL RAILROAD OF NEW JERSEY FROM THE STATION, AT THE SOMERSET STREET UNDERPASS, IN THE TOP OF THE EAST END OF THE SOUTH ABUTMENT, AND ABOUT 6 INCHES LOWER THAN THE TRACK.
01/01/1971 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1971 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1985 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1985 THE NAME OF THE RAILROAD HAS BEEN CHANGED FROM THE NEW JERSEY CENTRAL TO THE NJ TRANSIT.
11/15/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 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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