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Details for Benchmark: DA1200

N 32° 01.650 W 112° 48.000 (NAD 83)

Altitude: 1743.73

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
A 471
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered in good condition, as described. GPS (HH-2) co-ordinates N32° 01.730', W112° 47.997'.

[Photos:]
photoA 471 / DA1200
A close-up of the mark, with the GPSr.
photoA 471 / DA1200
A close-up of the mark alone.
photoA 471 / DA1200
A wide view of the general area, looking east.

Documented History (by the NGS)

01/01/1981 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1981 16.7 KM (10.4 MI) NE FROM LUKEVILLE. 16.7 KM (10.4 MI) NORTHEAST ALONG STATE HIGHWAY 85 FROM THE POST OFFICE IN LUKEVILLE, ALSO 27.45 KM (17.05 MI) SOUTHWEST ALONG STATE HIGHWAY 85 FROM WHY, AT HIGHWAY MILEPOST 70, SET IN TOP OF A WHITE COLORED ROCK OUTCROP, 5.9 M (11.5 FT) SOUTHEAST OF THE CENTERLINE OF THE HIGHWAY, 38.7 M (127 FT) NORTHEAST OF THE MILEPOST. THE MARK IS 0.3 METERS NW FROM A WITNESS POST. THE MARK IS 0.6 M ABOVE THE HIGHWAY CENTERLINE.
11/10/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 RECOVERED IN GOOD CONDITION.
03/06/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 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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