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Details for Benchmark: AI7615

N 38° 51.567 W 077° 02.717 (NAD 83)

Altitude: 17.15

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

Location:
In ARLINGTON county, VA View Original Datasheet
Designation:
DCA 00 05
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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found while wandering around DC

another benchmark

Found as described in good condition.

[Photos:]
photoAI7615 mark: DCA 00 05 Alexandria VA
Spiffy cover over mark, and in nice clean condition compared to others I've seen.
photoAI7615 mark2: DCA 00 05 Alexandria VA
Mark with the cover up. Had to clear out a bit of dirt and spider webs - might be worse in the summer.
photoAI7615 area S: DCA 00 05 Alexandria VA
View to the S just after sunrise; mark is at lower left indicated by notebook. Building is the general aviation terminal for National Airport; the main terminal is in the background, not really visible.
N 38° 51.559 W 077° 02.733

Found today as a small detour on the bike ride home from work. Listed coordinates place GZ about 25 meters from reality. Attached waypoint is average of 120 readings taken with Garmin GPSmap 60CSx, EPE ~ 3 meters.

TTFN,
StarryEyeGuy

The benchmark has a fancy compass rose cover about 8 inches in diameter. It is about 4 feet to the west of the sidewalk in a mulched area.

[Photos:]
photoArlington, Virginia at National Airport
Under the cover is the actual disk.
photoArlington, Virginia at National Airport
The fancy cover for the benchmark.
photoArlington, Virginia at National Airport
The benchmark's cover is seen between the two shrubs by the sidewalk seam. The Nation's Capitol building can be seen in the far distance between the large shrub and the light pole.

Documented History (by the NGS)

Unknown by RICE (MONUMENTED)
08/01/2000 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA) AT THE RONALD REAGAN WASHINGTON NATIONAL AIRPORT, AT BUILDING NO 12 AT NORTHWEST END OF AIRPORT AND MARK IS AT WEST SIDE OF BUILDING. 8.0 FEET (2.4 M) SOUTH OF A LIGHT POLE SUPPORTED BY A 10 FOOT (3.0 M) 10 INCH CONCRETE FOUNDATION, 10.8 FEET (3.3 M) WEST OF WEST SIDE OF BUILDING NO 12, 4.3 FEET (1.3 M) NORTHEAST OF A TREE, 22.0 FEET (6.7 M) EAST OF CENTERLINE OF BLACKTOP ROAD LEADING TO A PARKING LOT K. 2.0 FEET (0.6 M) ABOVE ROAD.

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 November 2000. No vertical observational check was made to the station.
  • 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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