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Details for Benchmark: KW2676

N 40° 03.950 W 077° 27.617 (NAD 83)

Altitude: 797.86

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

Location:
In CUMBERLAND county, PA View Original Datasheet
Designation:
GOOD AZ MK 1935 1942
Marker Type:
azimuth mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered in good condition after obtaining permission to search.. Mark is located in front yard of red brick house at N corner of intersection of SR 174 & Goodhart Rd....

[Photos:]
photoGOOD AZ MK 1935 1942 (KW2676) Cumberland Co., PA
photoGOOD AZ MK 1935 1942 (KW2676) - area looking SW

Description indicates mark is well into the well-manicured front lawn of a private residence. Chose not to disturb residents at dinner time to ask permission to search for the disk.

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
01/01/1979 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1979 3.4 MI NE FROM SHIPPENSBURG. SAME AS DESCRIPTION FOR AZIMUTH MARK GOOD 1935, EXCEPT CHANGE HIGHWAY 33 TO STATE HIGHWAY 174.

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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