Details for Benchmark: KX1603
N 40° 48.417 W 079° 57.900 (NAD 83)
Coordinates may not be exact. Altitude is POSTED and location is SCALED. (more info)
- In BUTLER county, PA View Original Datasheet
- W 4
- Marker Type:
- bench mark disk
- light structures
- Mark of questionable or unknown stability.
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Documented History (by the NGS)
|01/01/1931 by CGS (MONUMENTED)
|01/01/1952 by NGS (GOOD)
|DESCRIBED BY NATIONAL GEODETIC SURVEY 1952
AT RENFREW. AT RENFREW, BUTLER COUNTY, 5 RAILS SOUTHWEST OF THE DOOR TO THE WAITING ROOM OF THE BALTIMORE AND OHIO RAILROAD STATION, 13 FEET SOUTH OF THE MIDDLE OF A WOODEN WATER TANK AND 7 FEET FROM THE EAST RAIL, IN THE NORTHWEST CORNER OF A LARGE ROCK. A STANDARD DISK, STAMPED W 4 1931.
- 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 1992. * This is a POSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km.
- 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.