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Details for Benchmark: MJ0206

N 41° 31.117 W 094° 56.350 (NAD 83)

Altitude: 1194.55

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

Location:
In AUDUBON county, IA View Original Datasheet
Designation:
5.325
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 IAGS (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 3.3 MI N FROM LORAH. IN AUDUBON COUNTY, 3.3 MILES NORTH ALONG THE CHICAGO, ROCK ISLAND AND PACIFIC RAILROAD FROM THE STATION AT LORAH, CASS COUNTY, 2 POLES NORTH OF MILEPOST 450, AT A PRIVATE-ROAD CROSSING, 32 FEET WEST OF THE CENTERLINE OF THE TRACK, 33 FEET NORTH OF THE CENTERLINE OF THE ROAD, 36 FEET EAST OF THE EAST EDGE OF THE PAVEMENT OF U.S. HIGHWAY 71, 17 FEET NORTHEAST OF AN IRON MARKER, AND ABOUT 2 FEET LOWER THAN THE TRACK. A STATE SURVEY STANDARD DISK, STAMPED 5-325 AND SET IN THE TOP OF A CONCRETE POST.

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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