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Details for Benchmark: AW4231

N 29° 26.233 W 095° 40.850 (NAD 83)

Altitude: 66.13

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
U 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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N 29° 26.268 W 095° 40.967

Pictures and coordinates accompany

[Photos:]
photoThe Mark
photoFrom Above
photoWide View

Recovered as described in good condition.

[Photos:]
photoAW4231
photoAW4231 setting

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 8.35 MI NE FROM GUY. 7.65 MILES NORTHEAST ALONG FARM ROAD 1994 FROM THE JUNCTION OF STATE HIGHWAY 36 AT GUY, THENCE 0.7 MILE NORTHEAST ALONG FARM ROAD 762, AT THE JUNCTION OF A FIELD ROAD SOUTHEAST, 38 1/2 FEET SOUTHEAST OF THE CENTER LINE OF THE ROAD, 19 FEET SOUTHWEST OF THE CENTER LINE OF THE FIELD ROAD, 11 FEET SOUTHWEST OF THE SOUTHWEST END OF A WIRE GATE, 4 1/2 FEET WEST OF A T JUNCTION FENCE POST, 1 1/2 FEET SOUTHWEST OF POWER POLE 130, 3.4 FEET NORTHWEST OF A FENCE, 12 FEET SOUTH OF THE CENTER OF THE SOUTHWEST END OF A 36-INCH PIPE CULVERT, 1.5 FEET NORTHEAST OF A WITNESS POST, ABOUT LEVEL WITH THE ROAD, 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.
06/22/1996 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1996 RECOVERED IN GOOD CONDITION.
01/10/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 RECOVERED IN GOOD CONDITION.
11/21/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 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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