Details for Benchmark: GP0103
N 36° 56.067 W 111° 28.567 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In COCONINO county, AZ View Original Datasheet
- E 80
- Marker Type:
- survey disk
- in rock outcrop
- Most reliable and expected to hold position/elevation well.
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Documented History (by the NGS)
|01/01/1957 by BOR (MONUMENTED)
|01/01/1962 by NGS (GOOD)
|DESCRIBED BY NATIONAL GEODETIC SURVEY 1962
0.3 MI E FROM PAGE. ABOUT 0.3 MILE EAST ALONG U.S. HIGHWAY 89 FROM THE NORTHEAST END OF THE GLEN CANYON BRIDGE AT PAGE, ARIZONA. 224 FEET EAST-SOUTHEAST OF THE JUNCTION OF THE HIGHWAY AND AN ASPHALT ROAD LEADING TO VISTA POINT, 91 FEET SOUTH-SOUTHEAST OF A TRAFFIC CONTROL LIGHT, 56 FEET NORTHEAST OF THE CENTERLINE OF THE HIGHWAY, 3.0 FEET SOUTHWEST OF THE BASE OF A SANDSTONE FORMATION, ABOUT 3 FEET ABOVE THE LEVEL OF THE HIGHWAY, AND SET IN THE TOP OF A SANDSTONE OUTCROP.
|01/01/1983 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983
RECOVERED IN GOOD CONDITION. NEW DESCRIPTION FOLLOWS. 0.5 KM (0.3 MI) SOUTHEAST ALONG US HIGHWAY 89 FROM THE NORTHEAST END OF THE GLEN CANYON BRIDGE IN PAGE, IN TOP OF THE EAST END OF A 42- BY 57-FOOT FLAT AREA OF SANDSTONE OUTCROP BETWEEN A 15- BY 15-FOOT KNOLL OF SANDSTONE PROJECTING 5 FEET ABOVE THE SURFACE OF THE GROUND AND A NORTH-SOUTH RIDGE OF SANDSTONE PROJECTING 10 FEET ABOVE THE SURFACE OF THE GROUND, 0.37 KM (0.23 MI) NORTHWEST OF MILEPOST 549, 17.1 METERS (56 FT) NORTHEAST OF THE HIGHWAY CENTERLINE, 71.4 METERS (234 FT) SOUTHEAST OF THE EXTENDED CENTER OF A PAVED ROAD LEADING SOUTHWEST, 1.3 METERS (4.5 FT) WEST OF THE BASE OF THE SANDSTONE RIDGE. THE MARK IS 1.3 METERS E FROM A WITNESS POST. THE MARK IS 0.6 M ABOVE THE HIGHWAY.
- 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.