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Details for Benchmark: HV9150

N 38° 48.242 W 077° 21.677 (NAD 83)

Altitude: 344

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

Location:
In FAIRFAX county, VA View Original Datasheet
Designation:
GPS 160
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.

Reference Points

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Documented History (by the NGS)

01/01/1991 by MSI (MONUMENTED)
DESCRIBED BY MEASUREMENT SCIENCE INCORPORATED 1991 THE STATION IS LOCATED IN FAIRFAX COUNTY, VIRGINIA, APPROXIMATELY 2.0 MI (3.2 KM) NORTHEAST OF THE TOWN OF CLIFTON. TO REACH THE STATION FROM THE INTERSECTION OF CLIFTON ROAD (S.R. 645) AND POPES HEAD ROAD (S.R. 654), PROCEED EAST ALONG POPES HEAD ROAD FOR APPROXIMATELY 1.3 MI (2.1 KM) TO THE INTERSECTION WITH COLCHESTER ROAD (S.R. 612). TURN RIGHT ONTO COLCHESTER ROAD AND TRAVEL SOUTH FOR 0.75 MI (1.21 KM) TO THE INTERSECTION WITH SADDLEHORN DRIVE (S.R. 5475). TURN LEFT ONTO SADDLEHORN DRIVE AND PROCEED EAST FOR 0.1 MI (0.2 KM) TO THE INTERSECTION WITH QUEENS BRIGADE DRIVE (S.R. 5464). TURN RIGHT ONTO QUEENS BRIGADE DRIVE AND TRAVEL SOUTH AND EAST FOR APPROXIMATELY 0.5 MI (0.8 KM) TO THE STATION ON THE RIGHT, SOUTH OF THE INTERSECTION WITH QUEENS BRIGADE COURT (S.R. 5459). THE STATION IS A FAIRFAX COUNTY DISK SET IN THE TOP OF A CONCRETE MONUMENT APPROXIMATELY FLUSH WITH THE GROUND SURFACE, STAMPED GPS 160 1991. THE DISK IS LOCATED IN THE FRONT LAWN OF RESIDENCE NUMBER 12143, 65.6 FT (20.0 M) SOUTHWEST OF THE SOUTHWESTERN EDGE OF THE PAVEMENT OF QUEENS BRIGADE COURT, 42.3 FT (12.9 M) WEST OF A 0.23 FT (0.07 M) MAPLE TREE, 36.4 FT (11.1 M) NORTHEAST THE NORTHEASTERN EDGE OF THE PAVEMENT OF DRIVEWAY NUMBER 12143, AND 38.7 FT (11.8 M) SOUTHEAST OF THE SOUTHEASTERN EDGE OF THE PAVEMENT OF QUEENS BRIGADE DRIVE.
01/29/1992 by MSI (GOOD)
RECOVERY NOTE BY MEASUREMENT SCIENCE INCORPORATED 1992 RECOVERED IN GOOD CONDITION.
01/05/2001 by DEWDAV (GOOD)
RECOVERY NOTE BY DEWBERRY DAVIS 2001 (CSW) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in November 1994.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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