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Details for Benchmark: CH0081

N 31° 54.333 W 112° 48.667 (NAD 83)

Altitude: 1489.68

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
1489.24
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

Unknown by USDA (MONUMENTED)
01/01/1953 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1953 1.8 MI N FROM LUKEVILLE. 1.8 MILES NORTH ALONG THE SONOYTA-AJO HIGHWAY FROM THE POST OFFICE AT LUKEVILLE, AT THE SOUTH END OF A TURN IN THE HIGHWAY, 99 1/2 FEET EAST OF THE CENTER LINE OF THE HIGHWAY, 1.3 FEET SOUTH OF A WITNESS POST, ABOUT LEVEL WITH THE HIGHWAY, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.3 FOOT ABOVE THE GROUND.
01/01/1981 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981 RECOVERED IN GOOD CONDITION.
11/10/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 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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