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Details for Benchmark: NB0120

N 42° 40.883 W 076° 13.333 (NAD 83)

Altitude: 1226.57

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

Location:
In CORTLAND county, NY View Original Datasheet
Designation:
H 177
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 4.0 MI NW FROM HOMER. TO REACH FROM THE POST OFFICE IN HOMER-- PROCEED 4.0 MILES NORTHWEST ON STATE HIGHWAY NO. 41 TO SITE OF BENCH MARK. BENCH MARK IS ABOUT 220.0 FEET SOUTHEAST OF A SMALL SCHOOL HOUSE, ABOUT 150.0 FEET NORTH OF THE CENTERLINE OF A SIDE ROAD INTERSECTION LEADING WEST, AND 15.0 FEET EAST OF AND ABOUT THE SAME ELEVATION AS THE CENTERLINE OF HIGHWAY. IT IS SET HORIZONTALLY IN THE SOUTH END OF THE EAST HEADWALL OF A CONCRETE CULVERT. A STANDARD DISK, STAMPED H 177 1942.
01/10/1991 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1991 (RHS) MARK NOT FOUND.

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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