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Details for Benchmark: PE0272

N 44° 22.117 W 068° 19.817 (NAD 83)

Altitude: 45.69

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

Location:
In HANCOCK county, ME View Original Datasheet
Designation:
Z 144
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

1/1/1962 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1962 0.2 MI N FROM SOMESVILLE. 0.25 MILE NORTH ON STATE HIGHWAY 102 FROM THE GRADE SCHOOL IN SOMESVILLE, 120 FEET NORTHWEST OF THE JUNCTION OF STATE HIGHWAYS 102 AND 198, 52 FEET SOUTH OF THE NORTH END OF ROCK-CUT, 33.5 FEET SOUTH OF CABLE LINE POLE NO. 3, 27.5 FEET WEST OF THE CENTER LINE OF HIGHWAYS 102 AND 198. SET VERTICALLY AT THE NORTH END OF A 20 FOOT ROCK-CUT AND ABOUT LEVEL WITH THE ROAD.
1/1/1962 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1962 RECOVERED IN GOOD CONDITION.
1/1/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (ELG) 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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