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Details for Benchmark: DA0318

N 32° 22.400 W 112° 51.667 (NAD 83)

Altitude: 1753.79

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
R 36
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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BM is in good shape.

[Photos:]
photoR 36

Recovered as described, in good condition.

[Photos:]
photoR 36 / DA0318
A close-up of the mark, with the GPSr.
photoR 36 / DA0318
A close-up of the mark alone.
photoR 36 / DA0318
A wide view of the general area, looking west.

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
01/01/1953 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1953 IN AJO. AT AJO, PIMA COUNTY, AT THE TUCSON, CORNELIA AND GILA BEND RAILROAD STATION, BETWEEN THE TWO WAITING ROOM DOORS IN THE EAST FACE OF THE STATION, 12 INCHES NORTH OF THE SOUTH DOOR, AND ABOUT 7 INCHES ABOVE THE GROUND. A STANDARD DISK, STAMPED 1751.670 R 36 1933 AND SET VERTICALLY.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 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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