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Details for Benchmark: AW5494

N 29° 32.517 W 095° 58.217 (NAD 83)

Altitude: 113.52

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
Y 1505
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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Recovered as described in good condition.

[Photos:]
photoAW5494
photoAW5494 setting

Documented History (by the NGS)

01/01/1987 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1987 9.0 KM (5.6 MI) NW FROM BEASLEY. 1.6 KM (1.0 MI) SOUTHWEST ALONG US HIGHWAY 59 FROM THE POST OFFICE IN BEASLEY, THENCE 7.44 KM (4.63 MI) NORTHWEST ALONG FM ROAD 1875, ALSO 9.54 KM (5.93 MI) SOUTH OF ORCHARD, AT THE T-JUNCTION OF US HIGHWAY 90 ALTERNATE AND FM ROAD 1875, 15.7 METERS (51.5 FT) SOUTH OF THE CENTERLINE OF THE US HIGHWAY, 13.4 METERS (44.0 FT) WEST OF THE ROAD, 0.9 METER (3.0 FT) WEST OF A POWER POLE. NOTE--ACCESS TO DATUM POINT IS HAD THROUGH A 5-INCH LOGO CAP. THE MARK IS 0.3 METERS E FROM A WITNESS POST THE MARK IS 0.7 M BELOW THE ROAD.
11/22/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 RECOVERED IN GOOD CONDITION.

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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