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Details for Benchmark: LY1220

N 41° 21.517 W 075° 29.650 (NAD 83)

Altitude: 1573.45

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

Location:
In LACKAWANNA county, PA View Original Datasheet
Designation:
M 233
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 2.1 MI NE FROM ABERDEEN. 2.05 MILE NORTH EAST ALONG COUNTY ROAD NO. 35005 FROM THE RAILROAD STATION IN MOSCOW, THENCE 0.05 MILE NORTH WEST OF THE INTERSECTION OF COUNTY ROAD 35005 AND 35004, SET IN LOWER SHELF OF EAST CORNER OF THE SOUTH EAST END OF A CONCRETE BRIDGE, 8 FEET BELOW THE ROAD, 20 FEET WEST OF POWER POLE 5680, 12 FEET NORTH EAST OF THE CENTERLINE OF COUNTY ROAD 35004, ABOUT 8 FEET BELOW THE LEVEL OF THE ROAD.

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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