Details for Benchmark: MD0026
N 41° 34.993 W 084° 26.041 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is ADJUSTED. (more info)
- In WILLIAMS county, OH View Original Datasheet
- Marker Type:
- bench mark disk
- set into the top of a round concrete monument
- May hold, but of type commonly subject to surface motion.
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Documented History (by the NGS)
|Unknown by USGS (MONUMENTED)
|01/01/1934 by NGS (GOOD)
|DESCRIBED BY NATIONAL GEODETIC SURVEY 1934
AT WEST UNITY. AT WEST UNITY, WILLIAMS COUNTY, ON THE WABASH RAILROAD, 33 YARDS WEST OF THE NORTHWEST CORNER OF THE STATION, AT A ROAD CROSSING, 15 YARDS NORTH OF THE NORTH RAIL, 15 YARDS EAST OF THE CENTERLINE OF THE BITUMINOUS ROAD, AND ABOUT 1/2 FOOT LOWER THAN THE TRACK. A UNITED STATES GEOLOGICAL SURVEY STANDARD CAP, STAMPED OHIO 792 AND RIVETED ON THE TOP OF A 3-1/2 INCH IRON PIPE.
|01/30/1996 by WOOLPT (GOOD)
|RECOVERY NOTE BY WOOLPERT CONSULTANTS 1996 (BS)
RECOVERED AS DESCRIBED.
- The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in April 1998.
- The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991. WARNING-GPS observations at this control monument resulted in a GPS derived orthometric height which differed from the leveled height by more than one decimeter (0.1 meter).
- The X, Y, and Z were computed from the position and the ellipsoidal ht.
- The Laplace correction was computed from DEFLEC99 derived deflections.
- The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
- 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.