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Details for Benchmark: AW4219

N 29° 21.867 W 095° 45.617 (NAD 83)

Altitude: 75.06

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
P 1213
Marker Type:
bench mark disk
Setting:
a metal rod with base plate buried/screwed into the ground
Stability:
May hold, but of type commonly subject to surface motion.

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Recovered as described in good condition.

[This entry was edited by Doc Geo on Monday, June 04, 2007 at 8:26:12 AM.]

[Photos:]
photoAW4219
photoAW4219 setting

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.45 MI NE FROM GUY. 1.45 MILES NORTHEAST ALONG FARM ROAD 1994 FROM THE JUNCTION OF STATE HIGHWAY 36 AT GUY, 0.1 MILE SOUTHWEST OF GUY CEMETERY, 1 POLE SOUTHWEST OF THE CROSSING OF AN UNDERGROUND PIPE LINE, 50 FEET SOUTHEAST OF THE CENTER LINE OF THE ROAD, 109 1/2 FEET NORTHEAST OF THE EXTENDED CENTER LINE OF A DRIVEWAY NORTHWEST, 1 1/2 FEET NORTHEAST OF A POWER POLE BEARING A TRANSFORMER, 1.2 FEET NORTHWEST OF A FENCE, 1.0 FOOT SOUTHWEST OF A WITNESS POST, A DISK ON THE TOP OF A 5/8-INCH COPPER COATED ROD WHICH IS 4-FEET LONG WITH A BASE PLATE ATTACHED. THE UPPER PORTION OF THE ROD IS ENCASED IN AN IRON PIPE PROJECTING 0.1 FOOT ABOVE THE GROUND.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JRM) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (MVM) RECOVERED IN GOOD CONDITION.
01/10/1998 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1998 MARK NOT FOUND.

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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