Details for Benchmark: GQ0012
N 36° 43.867 W 112° 05.633 (NAD 83)
Coordinates may not be exact. Altitude is POSTED and location is SCALED. (more info)
- In COCONINO county, AZ View Original Datasheet
- M 51
- Marker Type:
- bench mark disk
- in rock outcrop
- Most reliable and expected to hold position/elevation well.
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Documented History (by the NGS)
|01/01/1934 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1934
4.5 MI W FROM HOUSE ROCK SPRINGS. 4.5 MILES WEST ALONG U.S. HIGHWAY 89 FROM HOUSE ROCK SPRINGS, COCONINO COUNTY, 100 FEET SOUTHWEST OF AN 18-INCH CORRUGATED-IRON PIPE CULVERT, 108 FEET SOUTH OF THE CENTERLINE OF THE HIGHWAY, AT A RAMP LEADING DOWN INTO A WASH, AND IN THE TOP OF A LIMESTONE OUTCROP FORMING A RIDGE BETWEEN TWO INTERSECTING WASHES. A STANDARD DISK, STAMPED M 51 1934.
- 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.