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Details for Benchmark: JS0756

N 38° 47.483 W 121° 14.233 (NAD 83)

Altitude: 250.14

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

Location:
In PLACER county, CA View Original Datasheet
Designation:
C 830
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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Thought I would give benchmarking a whirl.

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 AT ROCKLIN. AT ROCKLIN, ABOUT 44 YARDS SOUTHEAST OF THE SOUTHEAST CORNER OF THE SOUTHERN PACIFIC CO. RAILROAD STATION, 58.7 FEET SOUTH OF THE SOUTH RAIL OF THE MAIN TRACK, 48.0 FEET EAST OF THE CENTER LINE OF THE FIRST STREET CROSSING EAST OF THE STATION, SET ON TOP AND ABOUT IN THE CENTER OF A LARGE FLAT GRANITE BOULDER WHICH PROJECTS ABOUT 1 FOOT ABOVE THE GROUND.
01/01/1969 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1969 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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